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NYC Subways Testing Flywheels
socolow writes "The New York Times (free registration required) has an article about the NYC subway system's use of flywheels to store the braking energy of trains approaching stations. Not only does this advance the development of flywheel energy storage, but it will help relieve a lot of the heat subways generate (always appreciated during the summer)."
Let me start by introducing myself. My name is Drew and I am 23 years old. I live in Atlanta, Georgia in a one-bedroom apartment. I have two sisters, Lisa, who is 20 and Carmen, who is 18. My story begins when my sisters decide to move to Atlanta with me to find their fortunes. We come from a small town in Virginia so a move to the big city is a big deal, and I was as excited to have relative nearby, as my sisters were to be moving here.
The day of the move finally arrived and I spent the day anxiously watching the street for their cars. They pulled up in separate vehicles and were both beaming with excitement. Both girls had huge grins that made their faces seem beautiful. Don't get me wrong, I thought that both of my sisters were pretty and had even eyed them in the past. They jumped out of the cars and ran to the door of my apartment and we all nearly jumped with glee and happiness. I led my sisters into the apartment and we began the daunting tasks of rearranging things to accommodate their belongings, and tried to work out the sleeping arrangements. I finally offered up my king sized bed to Carmen and Lisa, thinking that I would take the couch. Total nonsense according to Lisa, as they had bought blow up mattresses and would not be taking my bed. That worked out, we began to get ready for the evening. I had plans to show my sisters the big city.
When Carmen and Lisa came out of my bedroom dressed for the evening, I realized how much they had grown since our last get together. Maybe I had never noticed before but both girls were incredible young women now. Lisa has dirty blonde hair, hazel eyes, stands 5'6" and was wearing an ensemble that made me think thoughts a brother shouldn't have about his sister. A transparent top that showed off her under wire bra and breasts nicely, a mini skirt that enhanced her legs, and stripy summer sandals that showed off her perfectly pedicured toes made up Lisa's outfit for the evening. Carmen was a lot less flashy, wearing a silk ankle length skirt, a cotton t-shirt that strained against her breasts, and Carmen also had perfectly pedicured feet that were encased in minimal sandals.
We set out to see the big city. I took the girls out to dinner first at a restaurant in Virginia Highlands, then on to Buckhead to play in the bars. Our choices were limited due to Carmen's age, but the only thing that mattered to me was that I was spending time with my family. It was strange to see my sisters being hit on and I had to reign in my protective feelings, realizing that they could handle themselves. We all had a fantastic time and headed back to the apartment at about midnight. Lisa was a little intoxicated and was giggling all the way back to the apartment. Carmen rode in the backseat and soon started giggling to herself as well. I chalked it up to the infectious giggling that came from the front seat.
At last we arrived at the apartment and Lisa dug out a bottle of vodka from her bags, poured us all drinks and we sat down to reminisce. Both girls sat on the couch and propped their now bare feet on the coffee table and I sat in the chair across from them in a recliner. Having a foot fetish, my eyes kept straying to the delectable soles on display like a buffet. Let me make it clear that my staring at their soles was a habit formed from the years looking at the feet of beautiful girls and not sexually motivated in any way.
After several mixed drinks and a couple of hours had gone by Carmen suggested that the three of us play a game. Well I didn't have any board games or even a deck of cards so Lisa and Carmen started playing paper, scissors, and rock while I watched with quite a buzz due to the alcohol. My eyes kept playing over their feet and legs as they contorted into different positions while playing the game. Soon tiring of the juvenile game, Lisa suggested a more adult game. Both Carmen and I expected a drinking game so you can imagine the shock that registered on our faces when Lisa suggested Truth or Dare.
I was dumbfounded even more when Carmen, after her shock, excitedly agreed. I had played Truth or Dare as a kid and never with my sisters. My mind reeled at what was happening. Even though I never expected anything sexual to happen, I agreed knowing that I would learn a few secrets about my sisters. Lisa went first since she had come up with the idea and Carmen was her first victim. Carmen picked truth, of course, and was asked about the state of her virginity.
"I lost my virginity at 16 with Buck McClintock," she stated. That revelation floored me as I had went to school with his older brother and had never thought of Buck as grown up. Carmen picked Lisa next and the room got deathly quiet when Lisa picked a dare.
"O.K. Lisa," Carmen said, I want you to stand up and do a mock strip tease. Dance like you would if you were a stripper."
Lisa stood up and went to the stereo and put on a light jazz station. She started a slow bump and grind and slowly inched her mini up her butt. I saw with blurred vision that my sister wore a thong. She has a marvelous butt and I started to think of my sister in a whole new light. Lisa's next move was to proceed over to the recliner where I sat and started to dance exclusively for me. I enjoyed every minute of the three minute strip tease and secretly wished that she had went further than pulling up her skirt. Now it was Lisa's turn and she picked me.
With my heart racing and my palms becoming sweaty, I picked dare. I couldn't let my sisters think of me as chicken. Lisa floored me with her request.
"Drew," Lisa said, "after dancing all night, my feet hurt really bad and I'm sure Carmen's do too. I want you to come over here and give us both a relaxing foot massage."
It seemed like such a simple request as I sat on the floor at their feet and took Lisa's feet into my hands. Carmen placed her feet on my lap to await her turn and her feet were inches from my dick. I kept telling myself that these were my sisters as I began to rub their feet. I alternated between the girls and culd tell they were enjoying themselves by the moans coming from their throats. After a few minutes, Lisa happened to brush her foot across my crotch. I panicked, knowing that she felt my erection. No reaction from her after a while led me to believe that she had missed my obvious excitement.
"We can continue the game while Drew rubs our feet, can't we?" Carmen asked.
"Of course we can," Lisa said, "in fact it's Drew's turn."
"Carmen," I said, "truth or dare?"
"Dare," she stated with a challenging look on her face. I stepped up to the challenge by daring her to remove her top and bra for the remainder of the game. Lisa didn't bat an eye as she removed both items. Carmen giggled at our bravado and my penis stirred in my pants once more. Lisa was now up and I worried about any revenge she might extract for my last dare. My worry was misplaced as Lisa now challenged Carmen.
"Dare," Carmen said huskily and I wondered if the alcohol was getting to her.
"I want you to take off all your clothes and leave them off for the rest of the game," Lisa said. Suddenly the stakes went higher and I wanted to call off the game. I didn't though because I knew that we would not go far. After all we were related!
Carmen stood up and removed her silk skirt first and Lisa and I realized that Carmen wasn't wearing any panties. She swayed seductively in front of me an I stared at her pussy blatantly. Her lips were puffy and she had no hair on her pussy at all. I became even more aroused as she removed her top and bra. Her breasts were on the small side, I would guess a 32-B, and were slightly upturned. Her nipples were bright pink and erect either from the excitement of what we were doing or the cool air circulating in the apartment. She sat back down and replaced her feet in my lap and I continued giving her the foot massage. Every time I rubbed her arch, she would moan appreciatively. It was now Carmen's turn and she was the only one naked. I could just imagine the damage she was about to inflict on her sister or me.
"Drew," Carmen barely spoke, "truth or dare?"
"Dare," I challenged. This could get real interesting real quick.
"I want you to continue with the wonderful foot massage you have been giving us," she stated.
Well this seemed like I was getting off easy, until she added a stipulation.
"You have to continue the foot massage, but you can't use your hands. I want you to massage our feet with your tongue," she stated. Lisa almost spit out the vodka and orange juice she had just sipped, and then burst out laughing. I was shocked, to say the least and was worried that my sister knew about my foot fetish.
"What a wonderful idea sis," Lisa said, "by the way he's been checking out our tootsies, I'll bet he's going to love this."
I know I turned every shade of red in the book as I realized that Lisa knew about my fetish. I was also worried about the sexual feelings I was starting to have now that I would be allowed to indulge in my favorite sexual activity with my own sisters.
"You can start with me since it is my idea," Carmen told me. I reached into my own lap and took her left foot in my hand. I knew the rules and did not rub her foot in any way but brought her foot closer to my face. I could see every line on her sole as I examined my prize and could even see the tiniest traces of dirt where she had worn her sandals for the evening. Her foot looked to be a size 7 and her nails were done to perfection with a mint colored polish on her toes. I slowly and teasingly brought her foot closer and closer to my lips and tried to steady my hands as I was about to give into a bout of trembling.
I stuck out my tongue and both of my sisters drew in their breath. I think Lisa was just as excited as either Carmen or me and she was just watching. I slowly let my tongue trace a path along Carmen's arch, as this seemed to be a sensitive spot. Carmen moaned and instructed me to press my tongue harder into her arch. I did so with amazing results. Carmen moaned loudly and raised her buttocks off of the couch ever so slightly. Attentively I traced the ball of her foot and up to her toes. The sensation was incredible. I felt the charge in the room as I stuck my tongue between her baby and forth toe. I sucked her last two toes into my mouth and gently tugged on the bottoms of her toes with my tongue. I heard Carmen moan loudly again and realized that I was quickly losing control myself. I shut my eyes and continued along the path of her toes. The slight pungent smell went strait to my brain and set off a buzzing. Her toes tasted incredible and my straining erection grew even larger as I continued to suck in each and every toe.
Lisa decided to get into the act then by brushing her foot along my crotch again. Her toes danced on my erection and I reached out to grab her foot. She pulled away and reminded me of the dare's rules: no hands. She raised her foot to my face and I now had two delectable feet inches from my eyes. Lisa's toes were polished a deep burgundy and the pad along the ball of her foot was placed on my nose while I still sucked on Carmen's toes. I had moved along her toes with incredible slowness and was now sucking and licking Carmen's middle toe with abandon. I opened my eyes to discover that Carmen now had her legs spread and my sight was drawn to her shaved pussy and the juices starting to form on her thighs. Carmen's nipples were fully erect and her breasts had swollen slightly, just as her pussy lips had swollen. I withdrew her middle toe from my mouth long enough to continue our game. After all, it was my turn and I now had plans for my younger sisters. The foot sucking had gotten to me and had broken any taboos I previously held about incest. We were three consenting adults, right? Now if Lisa would just consent to my next idea.
"Lisa," I said, "truth or dare?"
"Dare," she replied with a grin.
"I want you to take off your remaining clothes and straddle Carmen," I told her. This would give me access to the bottoms of her feet while I worked on the tops of Carmen's feet. Lisa stood up and removed her mini-skirt and I went back to work on Carmen, this time with her right foot. Lisa then removed her panties and I noticed with glee that she had also shaved all the hair off her puss. Her lips were larger than Carmen's and her pussy was a deeper red. She placed her panties under my nose and I could smell her excitement and could see the damp spot in the center of her panties. Carmen opened her arms and Lisa straddled her. I was blessed with the sight of two pussies inches from each other. Lisa laid her head on Carmen's shoulder.
I worked my way over Carmen's toes and spent a long time on her middle and big toes. Carmen continued moaning and her juices kept flowing. It was a special experience and my mind was overwhelmed with what I was doing to my own sisters. If I kept a slow pace and worked both girls to a fever pitch, there was no telling where this episode might end up. I now hoped for a session in the bedroom with my sisters. Only an hour ago no such thought would've crossed my mind. Carmen was really getting into the scene now and her pussy swelled visibly. Several times while I stroked my tongue along her arch Carmen would reach down to touch herself but always stopped before actual contact between her hand and her pussy. Maybe the fact that her brother and sister were in the room kept her from openly masturbating.
I decided to switch partners and moved closer to the couch so I could reach Lisa's feet. I could feel the heat coming from my sister's bodies even though neither had moved an inch. They looked beautiful together and I kept glancing back and forth between my sisters, still surprised that things had gone this far. My tongue found Lisa's left foot and I could smell the sweat from the night of dancing. Lisa sucked in her breath as my tongue traced the space under her toes. I nibbled on the balls of her feet and she really seemed to enjoy this action.
"Harder," she requested, "bite my foot harder!"
I complied and increased the pressure steadily until she moaned out load.
"Yes, that's it," she said. "You can bite my toes as hard as you like also. Carmen, truth or dare?" she asked.
"Dare," Carmen replied.
"I want you to bite my nipples. Bite them long and hard. Make them hurt for me. If you can make me cry out in pain, I will become your sexual slave for the remainder of the week."
Carmen smiled and took one of Lisa's nipples into her mouth, the right one I think. I continued to work on Lisa's left foot, biting and chewing along the pads of her heel and ball. I took her big toe into my mouth and nibbled gently. Lisa wiggled her toe in my mouth impatiently and I knew that she wanted some more of the biting action. I withheld, hoping to bring her to a state of arousal that would allow me access to her body. Carmen bit down on Lisa's nipple enough to illicit a response, however it was a moan, and not a cry of pain. Carmen switched breast and took Lisa's other nipple between her teeth. Carmen bit down on the nipple in her mouth and once again Lisa moaned. I caught on that Lisa enjoyed a little pain with her pleasure and found this highly exciting. How I wished that I was the one biting on her nipples.
To make her happy, I started biting on Lisa's big toe. She moaned even more. I decided it was time to switch feet again and moved over to Lisa's right foot. Not wasting any time, I took her big toe into her mouth and bit down hard, I mean real hard. I wanted to cause Lisa the pain she desired. I wanted to be the one to make her cry out. It worked magically.
"Damn!" Lisa exclaimed with a little squeal. I did it. I made her yell out. I knew the deal that she had offered Carmen and hoped that the same deal applied to me.
"How about it sis? I made you yell out in pain. Do I get the same offer as Carmen?"
"Well..." Lisa thought out loud. "If I give myself over to you, you understand that it will be for sexual purposes only, right? I won't be doing laundry or the dishes, o.k.?"
I readily agreed and saw the look that Carmen shot my way. She wasn't happy, to say the least. I winked at her and thought to myself that I would soon have both of my sisters in a way a brother isn't supposed to.
"First things first," I said, "I need to get out of these clothes and I think Lisa should undress me."
Lisa smiled and stood up. She reached for my hand and I gave it to her, excited by even this innocent touch. Lisa helped me to my feet and I looked down at Carmen and could see the impression left on her legs by Lisa when she straddled Carmen. Carmen rearranged herself to get more comfortable and Lisa removed my shirt. I took her head in my hand, wrapping her hair in my fingers, and forced her face to my chest. Instinctively, Lisa stuck out her tongue and flicked it across my nipple. My head drew back in pleasure and I held her there for a little longer. She continued to lick and suck my nipple as her hands found their way to the waistband of my pants. Gently she tugged on my trousers. I moved my hips slightly to give the pants freedom to come down my legs. I let go of Lisa's hair and she stood upright. I was left in the middle of the floor in only my underwear with my two naked sisters ogling me. I felt fantastic. It was a sexual high like none I had never felt before.
I sat down on the sofa next to Carmen, leaving Lisa standing. Carmen moved closer to me and Lisa bent over to remove my briefs. Carmen glued her eyes to my crotch and I decided that now would be a good time to make my move on her. Lisa's hands made contact with my waist as my hand made contact with Carmen's breast. As Lisa tugged my briefs down, her hand made slight contact with my erection. My cock twitched at this unexpected contact. I pulled on Carmen's nipple and watched with fascination as she arched her back and her eyes rolled up in her head. Carmen was so excited that I could have probably had my way with her right on the spot. I held back any advances I might have made because I had bigger plans for her and my other sister Lisa.
While I was intent on watching Carmen and was busy pulling on her nipple, Lisa had succeeded in pulling off my underwear. Now all three of us were completely naked. I had Lisa knell in front of Carmen and I on the floor. I instructed her to interweave her hands behind her head. The effects of this simple action on her tight body were incredible. Her breast pointed to one o'clock and her stomach tightened. I rubbed my hands down Carmen's body, closer to her pussy. I couldn't wait to actually touch the baldness between her legs. Lisa watched with lust and she and Carmen locked eyes for a few seconds. Slowly I worked my way down Carmen's stomach. I made contact with the upper lip of her pussy and she drew in her breath. The sound excited me and I proceeded to go even lower. I reached the cleft of Carmen's pussy and could feel the heat radiating from the depths of her. Lisa started to sway rhythmically back and forth. I knew that she was getting tired of the pose she was holding, so I decided to ease her pain.
"Lisa," I said, "I want you to spread your legs a little further and put your hands down." She did, however her legs weren't far enough apart for me. "Spread your leg even more," I commanded. "I want to see your pussy, I want to see inside of you, I want to see the cooze dripping down your legs." Lisa flushed at this last statement and the thrill it gave me inspired me even more. This was going to be a great night!
The whole time I was giving Lisa her instructions, my hand played with Carmen's pussy. The wetness of her twat was making my fingers slippery. Carmen was moaning and bucking against my hand. I refused to bring her any satisfaction, ignoring her pleas and kept away from her clit and the entrance to her depths. I laid my head on her left breast and flicked my tongue across her nipple. I sucked it into my mouth and tugged on it with my teeth. I sucked the areole gently, then bit down fiercely on it. Carmen thrashed her head and yipped out in pain, but made no effort to move from me or my teeth. I withdrew her nipple from her mouth and leaned up to kiss her. I found her mouth open and receptive and quickly our tongues entered into combat. I ran my tongue over every crook and crevice inside her mouth as hers tried to wrap hers around mine. I withdrew my mouth from hers and still hadn't touched the areas of her pussy craving attention. I looked down at Lisa and noticed that she had laid down on the floor and was now furiously fingering herself. Motioning for Carmen to be quiet, we sat back to watch the show. Lisa was panting and moaning and I could tell that she was getting closer to orgasm, so I decided to establish the rules.
"Lisa!" I shouted. "What do you think you're doing? Did I give you permission to touch yourself?"
"No," she barely whispered.
"Well then don't you think there should be some consequences for breaking the rules?"
"What do you mean?" Lisa asked me mischievously. "What do you think I mean?" I asked.
"Do we get to punish her?" asked Carmen.
"Yes," with that simple word, I set the tone for the evening.
Lisa looked at us with dread in her eyes. I, however planned on a punishment that involved no pain. The only thing I planned to do was drive both of my sisters to a state of sexual excitement that neither had experienced before. Looking into Carmen's eyes I set my plan in motion.
I kissed Carmen deeply again while pulling on her nipples. I also kept an eye on Lisa. Soon enough, Lisa touched her pussy again. I reached down and took her hand in mine. I brought her hand to my lips and tasted her juices. She tasted sweet. Carmen moaned because I stopped paying her attention. I made her place her hand by her side. I leaned over and stuck a finger in Carmen's wet pussy, while reacquainting myself with her mouth. We kissed for quite awhile and Carmen was groaning and moving her hips in a circular motion in time with my manipulations. Lisa had finally caught on to the rules and did not touch herself but she was moving her hips in time with her sister's. I continued to work Carmen to a fevered pitch. Just as she began to orgasm, I removed my hand from her sopping cunt. She almost screamed in frustration.
Before any one could react, I grabbed Lisa by her hair and pulled her face toward Carmen's crotch. I could tell by the look on Lisa's face that she had not seen this development coming at all. Carmen's face registered shock as well but that look was replaced with one of pleasure as Lisa's lips made first contact with Carmen's pussy. It didn't take either sister long to get into it and soon enough Lisa's tongue was lapping at the wetness on Carmen's thighs. My plan had worked perfectly. Lisa continued to orally please our little sister and Carmen was close to orgasm rather quickly. I let Lisa lick Carmen through her first orgasm and Carmen nearly passed out from the intense pleasure that she was receiving. I sat and watched with a glazed look in my eyes, I'm sure!
I couldn't take anymore of just watching. I needed release and I needed it bad. I took Carmen and raised her off of the couch. I had Lisa lie on her back on the floor and positioned Carmen over her sister in a sixty-nine position. Lisa happily went back to licking Carmen and I positioned myself behind Carmen. I told Lisa that she was not to please herself and that her only function for the next few minutes was to please us. If she did a satisfactory job. I would allow her to come.
I pushed the tip of my cock into Carmen's pussy. She laid her head on Lisa's thighs and sighed out loud. I thrust deeper and Lisa continued her expert oral manipulations on Carmen's clit. I slowly pulled out of Carmen and pushed back in. I quickly developed a rhythm and was pounding her cunt so hard every time I sunk into her up to my balls, the motion would cause our bodies to rock forward and Lisa's tongue would brush over my scrotum. Due to the frenzied state I had worked myself into, I knew that I would not last long at all. Carmen was breathing harder, but had become real quiet as I pounded her tight pussy. The shaved lips of her woman felt like a pair of satin gloves gripping my dick with velvety smoothness. I had barely worked up a sweat when I felt the undeniable need to come. I thrust as hard and as fast as I could and dumped my load into Carmen's pussy. Carmen moved to extricate herself from Lisa and I, but I had other ideas.
"Carmen, stay right where you are," I pleaded, "Lisa will clean your pussy for you."
Lisa smiled and Carmen looked sharply up at me, then sat up slightly as to allow my juices to flow easier into Lisa's mouth.
"If you clean out her pussy real good," I said to Lisa, "you will be pleased by the two of us for one hour, any way you want."
"Yeah," Carmen said, "lick all of the come out of my pussy and you can have us. Lick me. Lick me clean slut."
Carmen was really getting into dominating her sister and moaned as Lisa's tongue dipped into her pussy for the first time. A big dollop of my come leaked out and around Lisa's tongue and she swallowed it with gusto. Again and again, Lisa's tongue dipped into Carmen's pussy and brought out a load of my come. I felt the stirrings of another erection beginning as I watched my sisters degrading acts. Carmen kept calling Lisa names like slut and whore and kept encouraging her with filthy talk. After a few minutes and more that one orgasm from Carmen, Lisa decided that she had cleaned all that she could out of Carmen's pussy. She sat up after, slithering out from under her sister and sat on the floor in front of the couch and in front of me. Lisa knelt up and kissed my cock tenderly. I shuddered and scooted down on the couch to allow better access to my manhood.
Lisa stuck out her tongue and wrapped it sideways around my dick. She slid her tongue up and down my shaft, but never put it in her mouth. I didn't care and was in heaven under her talented tongue. After a few minutes, Lisa stopped and declared me clean as well. I laughed and looked down at my swollen dick. She was right, I was spotless.
"If you did just as good of a job with Carmen's pussy, then you get to have us," I said.
"Why don't you inspect her and see for yourself," Lisa challenged. What a great idea. It seemed that my sisters could be as perverted as I was. I pulled Carmen back to the couch and placed her so that her butt was on the edge of the cushion. Carmen obligingly spread her legs to let me look. I tried hard to find any spunk left on Carmen's pussy. There was none I even grabbed Carmen's lips and pulled her pussy wide open. I saw her glorious pussy's depths. I saw how swollen my fucking had made her. I saw beads of sweat and clear pussy nectar. But I didn't see any of my own semen. Lisa looked at me with an expectant look on her face. She had done it and I told Carmen that we owed Lisa a full hour of pleasuring. I suggested that we take our activities to the bedroom. Both sisters jumped up and two perfect behinds led the way into my room.
Lisa propped herself on my bed and used pillows under her backside that raised her pussy slightly from the surface of the bed. I could see that Lisa's pussy was leaking slightly and knew that after all that had transpired so far, she needed some form of release. Lisa looked at her sister and me. The look on her face showed that she had plans for us.
Lisa reached up with her right hand and grabbed Carmen's head and guided it to her breasts. She then grabbed my head and guided it to her waiting pussy. I eagerly settled myself in for a long session of pussy eating. Carmen attacked Lisa's breast with gusto, taking first one then the other nipple between her teeth and gently pulling on them. I opened my sister's snatch with my tongue and applied my tongue to her clit with determination. I was determined to make her come. Lisa grabbed our heads again and forced us to switch places. As I bent my head to the task of worshipping Lisa's breast, I kept stealing glances at Carmen hard at work on Lisa's cat. The sounds of Carmen drinking Lisa's pussy juice down her throat was quite erotic.
Lisa only let us please her for a few moments this way before throwing me to the bed. She had Carmen straddle my head while she proceeded to mount herself on my erection. As Carmen's cunt made it's way down to my mouth, Lisa slowly slid my dick into her pussy. Once again, the shaved surface of a pussy slid down my dick with apparent ease. Carmen was still swollen and my tongue had no problem finding her clit. I slid my tongue all around her little nub and up into the entrance of her pussy. Lisa started to bounce on my dick and from the sounds coming from above, I concluded that my sisters had to be kissing each other. The thought of my sisters making out above me while I pleased both of them excited me in a perverse way.
I came closer and closer to going over the edge as Lisa pounded herself into my dick and balls. She reached behind her and squeezed my nut sac and gradually increased pressure. Surprisingly, this did not hurt like one would think and I found the sensation incredibly erotic. The squeezing spurred me on and I licked Carmen's pussy with abandon. I shot my tongue up into her depths and circled her clit. I sucked her lips into my mouth and licked her clean of her own juices. Closer and closer I came to cumming. As Lisa applied even more pressure to my balls, I exploded inside of her. The squeezing of my balls produced an intense orgasm and I shot spurt after spurt into Lisa's waiting snatch. I withdrew my tongue from Carmen's pussy as she had also climaxed during my own.
Lisa roughly pushed Carmen from my head and placed herself over me. She was just out of reach of my tongue and I wanted to lick her snatch for her. I know that she wanted me to clean her out like I had her clean out Carmen. My tongue unsuccessfully reached out again and again for her pussy, but it remained just out of reach. With no warning whatsoever Lisa spread her lips with both hands and my own cum started to drip out of her snatch. The only thing was that Lisa wouldn't allow me to clean her with my mouth. She preferred to drip it all over my face. She even inserted her fingers into her pussy and helped the thicker of my juices out.
What was left on her fingers, she fed me. Lisa stood up and ordered Carmen to clean my face. Carmen jumped right on me and started licking my come of my own face. I was in heaven and as Carmen cleaned my face I dozed in and out of sleep. The last thing I remember that evening was my sisters curling up beside me in bed. My only regret was that we had drunk too much to turn this into an all-nighter. We slept in the same bed for the first time since we were kids.
I woke up the next morning with Lisa and Carmen lying on either side of me. I looked down at them and reminisced about the previous evening and my face broke into a smile. You know what? That was their first day in town with me. Don't forget, they were planning on moving here! God, I was going to be a happy man.
Ouch! Next I'll try a whole train.
Rather, they should slow down a little bit while people on the platforms run on moving sidewalks. The people on the sidewalks, once they reach and adequate speed, can jump on board the trains. This would just speed up things for everyone.
...throw vagrants in front of them! This way you solve your braking problem *and* your homeless problem in one step!
if they taper to a smaller edge along the outside edge of the flywheel, if they taper to thicker along the outside edge compared to the inside edge they flywheel apart causeing many distractions among the people that happen to be looking at the time
Is this the real story?
Why not just use regenerative braking.
Aren't they already electric?
It is probaly easier to implement (mechanically) and less additional weight on the subway.
After the power outages a couple weeks ago (most of Lower Manhattan was affected), it was starting to feel a little too much like California, if you ask me.
Seriously, flywheels are a really cool energy storage technique. They are a little scary when you consider the damage that a giant, heavy disk spinning very quickly could do in the event of a collision, but that is a small price to pay with the cost of energy so high these days.
When can I get one in my car?
Karma: Good (despite my invention of the Karma: sig)
Now if they just make the flywheel out of a superconductor, then not only will it store energy, but the train will be weightless!!!
Boeing, get on it!
Don't Bogart the fish sticks
sPh
Since the flywheels are just great big gyroscopes, what happens when the train makes a sharp turn?
A legparnasom tele van angolnaval.
I would like to ask if it would be possible to have a preference option that says "No stories with a New York Times link" in them - I refuse to register, I refuse to play games to work around registering, and therefor any /. story where the bulk of the information is on a NYT-hosted page is useless to me, unless/until somebody posts the article contents. And since I'd like not to encourage karma-whoring and copyright violation, I'd sooner just remove such stories.
www.eFax.com are spammers
Oh say can you rock
There's trouble in a far off nation
Time to get in love formation
Your love is more deadly than Saddam
That's why I got to drop the bomb
Yvan eht noij x4
This party is happenin'
It's no mirage
So say it again:
Yvan eht noij x2
Join the Navy x3
Had a girl in every port
From here to Barcelona
But now I'm docked in Springfield
And girl, I'm gonna phone ya
Stormed a lot of beaches
But you're the one that I miss
Let's get back together girl
Let's reenlist
So sign me up
For a hitch of love
Recruit my heart
Four sweet years of love
They march all day
And clean latrines all night
Don't bust me down
Let's re-up tonight x2
Here's a user account I created to see this article at NY times without everyone having to register: username: slashdot2233 password: slashdot I'd hate to see anyone posting without having actually read the article. ;-)
Wired ran an article about the new flywheels a while ago.
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what???
Unfortunately, it takes 45 minutes of winding for 4-5 seconds of run time.
the title says it all.
Play the stock market drinking game!
tcd004
Before the visit ended the other day, a final question had to be asked: What is the purpose of the floating ping-pong ball?
"Oh that?" Mr. Lobenstein smiled like a child. "That's just to amuse us. Sometimes we get bored."
I have read about fly wheels for a few years now. They are amazingly interesting. I really hope they are used more places. The use of flywheels in this type of situationw ill help push the technology further. Besides uses for trains and mobile towers where else have flywheels already been put to use? I heard NASA would be using some? Does anyone beleive flywheels will eventually be the solution to the terrible battery storage? Could flywheels be used in electric hybrid cars instead of 1000 lbs of batteries? Long live the flywheel and i hope this technology finds its place in every day uses.
Dan Mayer: my blog, essays, art, etc
I believe thats what they are doing, except they are using flywheel batteries to store the electricity generated during braking.
Feed the need: Digitaladdiction.net
Didn't Arthur C. Clarke describe something like this in "The City and the Stars?" It's been a long time since I read it, but I believe that they had a transportation system that was essentially a wide moving sidewalk; the closer to the middle you moved, the faster it went.
werd!
YAH
Just in case anyone is too lazy to go read it, here's the content of the article:
The people who ensure that electric power is supplied constantly and consistently to the New York City subway get very little attention.
Track work somehow seems more honest -- the hoisting of heavy rails and traversing of dark tunnels. Water work seems more daring -- inflatable skiffs and scuba gear dispatched to save the system from sure inundation. Even motormen and conductors are figures of stoic romance, captaining their 400-ton trains above and below the city.
Try as you might, it is just not as easy to summon that kind of interest in a guy with a pair of alligator clips and an ohmmeter, poring over a schematic of a circuit breaker.
Then again, if it were not for that guy and the 650 volts of direct current that he knows how to dispatch through the third rail, miles of tracks and yards full of subway trains would amount to nothing more than ornamented chunks of steel.
So when an invitation was extended recently to visit a secluded stretch of land along Jamaica Bay, for a peek at what was described as "this incredible new gadget that the power guys are working on," a visit was dutifully paid.
The subway rarely conjures up images of high technology. But in a cinder-block barn near the jet path of Kennedy International Airport, the subway's chief electricians were presiding over something that looked like some kind of miniature mission control, much more rocket science than railroading.
On a desk sat a flat-panel computer screen, covered with numbers and graph patterns and colored lines. In front of the computer sat 10 whirring metal boxes slightly larger than refrigerators, a ping-pong ball levitating mysteriously in an updraft of air above one of them.
At the desk sat Robert W. Lobenstein -- Loby to his friends -- with a radio in his hand and a look of excitement on his face that only someone with an engineering degree can have.
"Five . . . four . . . three . . . two . . . one," he called into his radio. "Full acceleration southbound!"
Despite the distant roar, Mr. Lobenstein, the general superintendent of power operations for the subway, was not launching a shuttle. He was launching a train -- one of the brand-new models starting to appear now on the L line -- along a 10,000-foot test track just outside the barn.
The train and the big metal boxes inside the barn were conspiring to do something that had never been done regularly in the subway. Since the subway first opened, trains have had a one-way relationship with the third rail: they take power from it. (During peak demand, in fact, subways and commuter trains use 600 million watts, enough energy to supply all the homes in Birmingham, Ala.)
But now, harnessing the mass and momentum of the new train cars, the subway's electricians are trying to strike up a better relationship between train and rail. In theory, it works like this: A moving train consumes power. When it stops, however, it can use its motor as a generator and pump some of that power back into the third rail, to be consumed by other trains around it.
The only problem is that when the power goes back into the rail, it is quickly eaten up by the resistance of the metal. So if other trains are not close by, to scoop up the power, the extra electricity dissipates like so many ripples in a pool.
Last summer, transit electricians and officials at the New York Power Authority, which supplies the third-rail, figured out a way to fix that. It was not a radically new idea, nor did it employ especially new technology. But finding anything to fix a problem in a place as huge as the subway is always a big job.
The solution: a battery.
A very, very big battery. Or, to be more accurate, 10 of them, each weighing as much as a Volkswagen Bug and together able to store up to a million watts of power.
A chemical battery, even the biggest around, could not handle this job. So the electricians harnessed a different kind, called a flywheel, which takes electrical energy and converts it to mechanical energy, using a rotating magnetic mass that spins up to 36,000 revolutions per minute.
For the last several weeks, through countless countdowns and test runs, the flywheels have been working like sponges, successfully absorbing the extra energy put out by a braking train. Or, as Robert Schmitt, another transit electrical official, put it, excitedly: "They're sitting here, saying: `Give it to me! Give it to me! Give it to me!' "
And after taking, they have also been giving -- sensing that a train is accelerating and releasing the extra power to help it speed up.
Now, instead of a ragged green line on the computer screen, showing power dips and spikes, the lines have begun to smoothe out nicely. This makes electricians very happy.
Should the batteries be expanded to the whole subway system, they could also make accountants very happy, saving up to $20 million a year in electricity costs.
Before the visit ended the other day, a final question had to be asked: What is the purpose of the floating ping-pong ball?
"Oh, that?" Mr. Lobenstein smiled like a child. "That's just to amuse us. Sometimes, we got bored."
# fuser -v
#
I still think my hamster could spin a wheel faster than some dumb fly.
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regenerative braking, not sure what technologies are used by it.
If you drive a car with a manual transmission the flywheel is connected directly to crankshaft at the engine. The clutch then rubs up against the flywheel to transfer power through the transmission to the wheels.
Anybody know who made the flywheels? There are only a few flywheel companies in business, for example Beacon Power (BCON)--but they are concentrating on other applications.
For the last several weeks, through countless countdowns and test runs, the flywheels have been working like sponges, successfully absorbing the extra energy put out by a braking train. Or, as Robert Schmitt, another transit electrical official, put it, excitedly: "They're sitting here, saying: `Give it to me! Give it to me! Give it to me!' "
Ohhhh daddy! Harder harder! More electricty! Uhhhhhh Uhhhhh!!!! YesssssSSSSS!!!!!! OHHHH UHHH!!!!!
Hmmm the heat has little to do with the electric motors, and much more to do with Air Conditioned Subway cars. The heat in the cars has to go somewhere so it (and some energy involved in moving it) goes out into the tunnels and the stations. Suposedly before A/C the cars were hot but the stations were cool(as one would expect for what is bassicaly a basement.)
I'd do something interesting, but my server can't handle a slashdotting.
The modifications to the trains are actually significant to support this, but it's about how the braking systems work and how the motor controllers work on the trains. There are a class of motor controllers that are not really compatible with regenerative braking, and they are fairly commonly used since they are cheaper than the others. The conversion to regenerative braking may involve replacing a fair bit of gear on the rolling stock. They were considering this kind of thing in San Diego, which is where I picked up lots of this trivia.
Many rail systems and streetcar systems have regenerative braking, but frequently they don't store the energy. What they do is have one unit braking while another is accellerating, so the excess power is in effect transferred via the wire to the other vehicle. Think of cable car systems where the guy at the top of the hill counterbalances the one at the bottom. This is hard to make work though, the timing issues being what they are.
My $.02
------------------------
Jack not name, jack job!
can we hook up our cell phone cranks to the subway flywheel?
That tech support that does not kill me...drives me crazier
From the out_of_the_topic dept.
If you dont wanna register at NYTimes visit NYT Random Login Generator
But because NYTimes block based on referrers you got two chances 1 - Disable Javascript or a better one get Multizilla Toolbar for Mozilla
It has a nice option like "Dont send referrer" .
Choose it and boom you are in !
Never learn by your mistakes, if you do you may never dare to try again
Or, as Robert Schmitt, another transit electrical official, put it, excitedly: "They're sitting here, saying: `Give it to me! Give it to me! Give it to me!'
Ok, this guy needs to get laid. Now.
Where does the school board find them and why do they keep sending them to ME?
The people who ensure that electric power is supplied constantly and consistently to the New York City subway get very little attention. Track work somehow seems more honest -- the hoisting of heavy rails and traversing of dark tunnels. Water work seems more daring -- inflatable skiffs and scuba gear dispatched to save the system from sure inundation. Even motormen and conductors are figures of stoic romance, captaining their 400-ton trains above and below the city. Advertisement Try as you might, it is just not as easy to summon that kind of interest in a guy with a pair of alligator clips and an ohmmeter, poring over a schematic of a circuit breaker. Then again, if it were not for that guy and the 650 volts of direct current that he knows how to dispatch through the third rail, miles of tracks and yards full of subway trains would amount to nothing more than ornamented chunks of steel. So when an invitation was extended recently to visit a secluded stretch of land along Jamaica Bay, for a peek at what was described as "this incredible new gadget that the power guys are working on," a visit was dutifully paid. The subway rarely conjures up images of high technology. But in a cinder-block barn near the jet path of Kennedy International Airport, the subway's chief electricians were presiding over something that looked like some kind of miniature mission control, much more rocket science than railroading. On a desk sat a flat-panel computer screen, covered with numbers and graph patterns and colored lines. In front of the computer sat 10 whirring metal boxes slightly larger than refrigerators, a ping-pong ball levitating mysteriously in an updraft of air above one of them. At the desk sat Robert W. Lobenstein -- Loby to his friends -- with a radio in his hand and a look of excitement on his face that only someone with an engineering degree can have. "Five . . . four . . . three . . . two . . . one," he called into his radio. "Full acceleration southbound!" Despite the distant roar, Mr. Lobenstein, the general superintendent of power operations for the subway, was not launching a shuttle. He was launching a train -- one of the brand-new models starting to appear now on the L line -- along a 10,000-foot test track just outside the barn. The train and the big metal boxes inside the barn were conspiring to do something that had never been done regularly in the subway. Since the subway first opened, trains have had a one-way relationship with the third rail: they take power from it. (During peak demand, in fact, subways and commuter trains use 600 million watts, enough energy to supply all the homes in Birmingham, Ala.) But now, harnessing the mass and momentum of the new train cars, the subway's electricians are trying to strike up a better relationship between train and rail. In theory, it works like this: A moving train consumes power. When it stops, however, it can use its motor as a generator and pump some of that power back into the third rail, to be consumed by other trains around it. The only problem is that when the power goes back into the rail, it is quickly eaten up by the resistance of the metal. So if other trains are not close by, to scoop up the power, the extra electricity dissipates like so many ripples in a pool. Last summer, transit electricians and officials at the New York Power Authority, which supplies the third-rail, figured out a way to fix that. It was not a radically new idea, nor did it employ especially new technology. But finding anything to fix a problem in a place as huge as the subway is always a big job. The solution: a battery. A very, very big battery. Or, to be more accurate, 10 of them, each weighing as much as a Volkswagen Bug and together able to store up to a million watts of power. A chemical battery, even the biggest around, could not handle this job. So the electricians harnessed a different kind, called a flywheel, which takes electrical energy and converts it to mechanical energy, using a rotating magnetic mass that spins up to 36,000 revolutions per minute. For the last several weeks, through countless countdowns and test runs, the flywheels have been working like sponges, successfully absorbing the extra energy put out by a braking train. Or, as Robert Schmitt, another transit electrical official, put it, excitedly: "They're sitting here, saying: `Give it to me! Give it to me! Give it to me!' " And after taking, they have also been giving -- sensing that a train is accelerating and releasing the extra power to help it speed up. Now, instead of a ragged green line on the computer screen, showing power dips and spikes, the lines have begun to smoothe out nicely. This makes electricians very happy. Should the batteries be expanded to the whole subway system, they could also make accountants very happy, saving up to $20 million a year in electricity costs. Before the visit ended the other day, a final question had to be asked: What is the purpose of the floating ping-pong ball? "Oh, that?" Mr. Lobenstein smiled like a child. "That's just to amuse us. Sometimes, we got bored."
"PC Load Letter? What the $@#% does that mean?!"
Now, if they could just do something about the smell. The Broadway-Fulton-Nassau station certainly gets rank in the summer.
Save the planet. Vote NO on flywheels.
-- Thou hast strayed far from the path of the Avatar.
and a million watts is a lot of power.
Let's hope those flywheels are enclosed in something pretty solid.
Storing that much energy is one thing. Accidentally releasing it is another. When I was a student at MIT there was a permanent display in a glass case in the hallway of the biology department showing a centrifuge rotor that exploded, just to remind everyone of what happens when something spins too fast.
Let's also hope there's something to muffle that 600 Hz whine (which is close to the peak of human hearing sensitivity).
And I thought the wheels on Boston's Green Line screeching when going around sharp turns was bad...
"How to Do Nothing," kids activities, back in print!
Did the NYT defeat the random account generator? It no longer seems to work for me which is extremely disappointing. My personal information is far more valuable than the right to read a few newspaper articles. (Really, how does one weigh intimate knowledge to a few quarters?)
Why bother.
Related to this is the Parry People Mover which has been developed by a small company in Wales. This is designed as a light urban tansit system using flywheel to run the "people movers". The flywheels in these lightweight cars are recharged by either onboard LPG internal combustion engines or by electric motors fed from recharging points at stations.
They have been trialed on the Welsh Highland Railway and on the island of Mauritius omngst several other schemes - a quick Google search will turn up a lot more information about some of the trials.
While not a total success it is good to see innovation in this area.
Sailing over the event horizon
Right here A very good article (with illustrations) that tells how flywheels work and store energy. Pretty neat stuff.
If the flywheel is mounted horizontally, i.e. like a record player, then the turning would have no noticeable effect.
Might have problems if you wanna loop-the-loop though.
OT bit: You know, its really fscking annoying seeing one of those "cool ideas you think of when bored" appear for real.
I'm still working on the linear gearbox.
Ali
Ph33r m3!!!
What about the homeless people who rely on the subway heat vents in the winter?
thelocust[dot]org
username :cowboyneal2001
pw: cowboyneal2001
schweet.
I personally love the idea of using flywheels to store energy in this manner -- it seems very elegant to simply transfer the energy into rotational motion, rather than simply losing it all as heat.
There's one safety concern I have that I haven't yet seen addressed, though I've probably just missed it. If a flywheel is spinning at several tens of thousands of RPM (such as the 36,000 RPM flywheel mentioned in the story), what happens if the flywheel's physical supports are damaged or destroyed?
Basically, let's say a truck crashes into the building storing a spinning flywheel. The flywheel's housing is hit and breaks, putting the flywheel into physical contact with other materials. What happens? I have visions of a thousand-kilo ceramic disc either spinning off like the Tazmanian Devil, leaving a disc-shaped cartoon hole in whatever it encounters, or shattering upon impact and spraying shards of material at hundreds of meters per second in sundry directions.
The problem is, I don't know if this is actually true or not. Can anyone with an actual knowledge of such things answer? Thanks.
"Destroy science and religion. Science would re-emerge exactly the same; but not religion." - Penn Jillette, paraphrased
Here is what you need to know about flywheels, and I mean REAL FLYWHEELS, which are awesome.
Facts.
- Flywheels SPIN with ULTIMATE POWER.
- Flywheels spin ALL the time.
- The purpose of flywheels is to flip out and POWER things with REAL ULTIMATE POWER.
Flywheels are cool. And by cool, I mean totally sweet. Here are some more things you should know about flywheels.Real Ultimate Power
Flywheels are huge and heavy. They turn with ULTIMATE POWER. They don't quit.
Here are a flywheel's weapons:
- Flywheel.
- REAL ULTIMATE POWER.
Don't even compare a flywheel to a battery. If you compare it to a battery, you will DIE because flywheels have REAL ULTIMATE POWER, not like batteries you put in a laptop or something, and let me tell you they WILL kill you if you piss them off, and they won't even think twice about it.Testimonial:
Flywheels are dangerous and they don't have any problems with doing anything they want. They cut people's heads off just because they didn't ask them if they wanted fries. Flywheels are so crazy and awesome that they flip out ALL the time. I heard that there was this flywheel at the olympics, and there was rain so they made the events be put off until the next day and the flywheel FLIPPED OUT and destroyed the ENTIRE UNIVERSE. That's REAL ULTIMATE POWER.
My friend Mark said that he saw a flywheel totally uppercut some old lady just because she fell out of a window.
And that's what I call REAL Ultimate Power!!!!!!!!!!!!!!!
If you don't believe that flywheels have REAL Ultimate Power you better get a life right now or they will chop your head off!!! It's an easy choice, if you ask me.
Flywheels are sooooooooooo sweet that I almost crapped my pants. I can't believe it sometimes, but I feel it every day of my life. Flywheels are totally awesome and that's a fact. Flywheels are fast, smooth, cool, strong, powerful, and sweet. Fact. I can't wait to start mechanical engineering in a month. I love flywheels with all of my body (including parts I haven't gotten to use yet).
Q and A:.
Q: Why is everyone so obsessed about flywheels?
A: Flywheels are the ultimate paradox. On the one hand they don't give a crap, but on the other hand, flywheels are very careful and precise and they WILL kill you.
Q: I heard that flywheels are always cruel or mean. What's their problem?
A: Whoever told you that is a total liar. Just like other machinery, flywheels can be mean OR totally awesome. But they WILL kill you if you piss them off.
Q: What do flywheels do when they're not cutting off heads or flipping out?
A: Most of their free time is spent spinning, but sometime they shoot lightning. (Ask Mark if you don't believe me.)
I had a picture of my best friend Mark showing his flywheel off but we had to take it down because of the flywheels. Let me tell you: you don't want to mess with a flywheel. These guys have REAL ULTIMATE POWER.
Trust me. You can ask Mark, he'll tell you too.
Of course, I don't recommend loop the loops, and the CrossRoads of Danger(TM) would have to go.
The cool cardboard desert backgrounds and grandstands could stay, though. And the orange plastic track would make an excellent subway defense weapon!
"Mom, he's beating me with the track again!" "Well, hit him back, I'm busy!"
The Wired article made me wonder about the probabilty of using a flywheel for a UPS? Any thoughts? Seems simple enough - get a heavy wheel on a decent bearing train and connect to a small motor that can eventually spin it up to high RPM and then use an electric clutch to keep it DISengaged from a generator. Add a really small UPS to cover the switch over time and viola! As soon as the power fails, the clutch engages the flywheel to generate power for 15+ minutes (enough time to perform a clean shut down). I like it....
I'm in my right mind and I have the answer to everything!
http://www.screenbert.com/ntimes/rail.htm
A good break down of Power vs. Energy located here . Not here.
If we don't fight for ourselves no one will.
I love the NYC Subway system. It smells bad at times, but its an engineering marvel. So many people, tunnels, electrical, mechanical systems. a good website is http://www.nycsubway.org
http://github.com/gbook/nidb
Here's a mirror of the story - (no registration needed!) /.ers
Enjoy fellow
"when the power goes back into the rail, it is quickly eaten up by the resistance of the metal. So if other trains are not close by, to scoop up the power, the extra electricity dissipates like so many ripples in a pool."
eaten up??? I'm laughing thinking of the interview that this reporter must have had with the Power Authority guys.
"store up to a million watts of power."
NO!
power=energy/time
you can store ENERGY, not power.
Effectively this is like a big capacitor. I surmise a chemical battery would have issues with constant discharge/recharge. Whereas a flywheel couldn't care less.
:D
The flywheels could not go in the train because the bumpy ride would continuously siphon off power, and you know power siphoned off would be in the form of heat. Not to mention that each battery weighs as a small volkswagen
Their solution to the voltage loss in the 3rd rail is a half-assed one. They claim the distance between the trains would cause too much loss in the line if they tried to transmit power back across it. Yet they are still transmiting power across it anyway?!? They must plan on the average distange between a train and the battery station to be smaller than between a train and another train, though the article strangely failed to say.
I really didnt enjoy 1/2 the article being fluff about the lack of glory in being a transit engineer...
Maybe the LA County MTA can take a few hints from these guys on the Metro Rail. Or for that matter, any mass transit system using rails.
This sig no verb.
I hate to sound like a weenie and say "ME TOO", but I STRONGLY second this request.
I supect that posting this as a comment isnt enough to get it to the person thats posting these though.
If you cant post a link that displays the story, then dont post anything at all.
I'm not lazy at all. I simply have no desire to support the idiotic practice of web publishers trying to mine my information in return for content. If the content is truly free, then it is free. If the cost of the content is "We sell your contact info, and you get the unholy excrement spammed out of your email account", then the price is too high - I refuse to pay. And since I also prefer not to lie, I choose not to enter garbage, but rather simply not go to the site.
And unlike the many folks who will bitch every time a NYT story is submitted, I simply asked for the ability to make my own choice about whether I would see such stories. I don't ask that others be prevented from seeing them - I don't berate the story poster for linking to NYT. I simply ask that the same sort of choice that I can make for Katz, MS or YRO stories be extended to NYT registration required stories.
And I think the moderation history on my previous comment is itself hilarious. While I can whole-heartedly support the "Off-topic" mods, the Redundant moderation is quite amusing - were there any other posts expressing my sentiment? And the less said about those metamoderations posing as moderations (overrated and underrated) the better.
www.eFax.com are spammers
They'll put your eye out.
I understand the concept of harvesting braking to push a flywheel to greater speeds, therefore storing the energy, but I have a couple of questions:
Aren't flywheels tremendously heavy? Wouldn't the additional weight cause longer stopping distances, especially under emergency braking?
I do understand that the braking would be assisted by the flywheel itself (spinning it up), but you never get anything for free (See The First Law of Thermodynamics.). When spinning up the wheels, you'd have heat loss, and loss again when they are spun down. Secondly, again, because of the 1st Law, wouldn't the heat generated by all of those flywheels spinning up and down exactly equal the heat savings? Moreover, thinking of emergency braking - What is the top speed of the flywheels? How strong do the gears need to be to spin up the flywheel to top speed very quickly? And at what tremendous gear ratio?
Don't think that I'm against it, cause I'm not. I think the electricity savings alone make it worth the effort and expense, but I'm not convinced that the trains would be as safe as the existing ones, and that there would be any heat savings. That said, CA needs to convert the BART next....
The Dopester
"Yes, I'm a Karma Whore, but I'm doing it to pay my way through school."
The article says that the chief electricians were able to get a ping-pong ball to levitate!
Has anyone told Boeing yet?
A: None. The Universe spins the bulb, and the Zen master merely stays out of the way.
36,000 RPM, thats more than eanough to blow up CD's. I wonder what they are made of.
Flywheels are overkill.
The New York Subway stations are currently elevated from the surrounding tunnels, so that a train slows down as it climbs into the station, and accelerates as it glides down out of the station. Real simple, no High Tech required, maybe not as interesting, though.
I was thinking the samething the bums are gonna all freeze to death.
...to the conservation bomb.
Pretty fly, for a white guy.
t ml
Give it to me baby, uh-huh uh-huh!
http://www.offspring.com/lyrics/lyrics_amr_pf.h
Both require some physical agility, and are rarely seen today.
http://web.mit.edu/charliew/www/centrifuge.html
First of all, the registration is annoying. Secondly, the NYT is biased. It is simply blatantly biased, and I do not feel that a "news" publication whose primary guiding principle is a hatred of traditional moral principles has any business being linked from a respectable site like Slashdot.
Either stop linking to it, or let us opt out. Pretty please?
When I was poking around flywheel development a while back (wasn't the company Slashdotted once?), I found Beacon Power does exactly this; they do institutional UPSes, and the wheels get buried into a proper chamber. Someone else in this thread pointed out they'll be doing this for the subway as well; there are issues there because it's a multi-layer system without a lot of "ground" between some levels, but as long as they design the walls of the chamber thick enough to contain any ablation in a detonation event, there won't be any risk to the structure of the subway that won't be revealed on installation.... (Meaning, you dig a hole in the subway, and put in a reallly thick chamber; if the subway doesn't collapse from the hole you dug, you're good to go.)
Most of the warmth in the subways is caused by heat that has been absorbed by the roadbeds above radiating downward into the stations, to a lesser degree by the exhaust of the air conditioning on subway cars, and to a still smaller degree by steam tunnels that border some of the tunnels and run in parallel conduits. Not by braking trains.
Wordnik, a dictionary project which aims to collect
What about the homeless people who rely on the subway heat vents in the winter?
They will provide the lubrication.
It's not about lying on the form, fuck head. True, I don't want them to have correct information. The crux of the issue is that I do not feel like taking the time to fill-out 20+ fields of nonsense, then go back and correct it repeatedly when it says "your ZIP/email/state/whatever is invalid".
As for personal information, spam is not the issue. NYT doesn't need to know my gender, age, region, etc. It's an issue of privacy.
Why bother.
Well, maybe the next time the cops offer them a spot at the shelter, they won't turn it down. Police and social services go out every night and round up the homeless so they don't freeze to death. Some of the homeless prefer a subway grate to the shelters and if they're not obviously nuts, the police have to let them do it. 1/3 of the homeless population is mentally ill.
It's illegal to be homeless in New York City.
Don't believe me? Want to mod me down? Go ahead, just don't try to not have a job or a home or any money in NY, otherwise they'll throw you in jail.
[o]_O
A very, very big battery. Or, to be more accurate, 10 of them, each weighing as much as a Volkswagen Bug and together able to store up to a million watts of power.
Are we to take this article seriously, or to believe anything it says? If they do not know the difference between power and energy, there is no telling what else in the article may be untrue.
The large ferris wheel in London doesn't stop, but it is only going at slow walking pace and there are people to assist wheelchair bound should they require it, but many "handicapped" people would push you under the train rather than accept that they "need your help".
... of course they can, you just have to make sure it is designed so that everyone (or as near as damn it) can travel safely and don't leave big gaps between cars for blind people to walk into etc. Flexible material to cover those gaps is used in many countries, but not in the UK ...
Many airports have travelling walkways and I've seen all sorts of "uncoordinated" people on them (I've even bumped into a couple of them, which makes me wonder who is the more uncoordinated!)
Might as well say that blind people can't travel on the existing system
I agree with the parent.
I'm just not going to register.
The IP of the NYT random login generator has been blocked, and I don't feel like using some huge group account that some jerk will change the password on.
I don't like giving websites personally identifying data unless it's for a decent reason and I trust the website. And I don't want to bother remembering whatever bogus login I generate.
It would be really nice to be able to shut off all NYT stories. How about an option to not see any stories where you can't just click the link and see the story? I already have fifty or so username:password combinations to remeber and I'd rather not have to deal with any more.
Life is too short to proofread.
The use of flywheels and/or regenerative braking will do much to improve the energy efficiency of subway trains, but will do little to improve subway comfort.
...) into the outside envronment as is heat from the hot coils of the heat pump. This is what makes the enclosed environment of the subway intolerable.
The heat generated during a trains accelleration was nearly eliminated when the resistive motor controls formerly used were replaced with energy efficient solid-state chopper controls. The heat generated from the use of the motors in the braking cycle is considerably less - most of the braking being mechanical.
The problem is subway discomfort is another modern technology - air conditioning.
Air heated by the hot, sweaty, sardine packed passengers, from the doors opening and closing and thermal (exterior heat and sun) load on the train is passed through the cold coils of a heat pump and then over electric heating coils to raise its temperature (dehumidifying it) and then passed back into the train.
All this heat and humidity has to go somewhere.
Humidity removed from the air is dumped (drip drip drip
When the Subways were being built in the early 1900's extensive studies, testing and engineering changes were done to ensure passenger comfort. I can remember the pleasure of riding the subways at the open front gratings on the trains - soaking up the COOL breaze as the train rushed through the subway.
When air conditioning was introduced the trains became cooler but the stations became intolerable. The answer then was to increase the ventilation of the subway to allow all this additional heat to escape. However, opening up the subways to vent the heat resulted in the subways being COLD in the winter and even Hotter in the summer.
Technology, go figure. Like the Victorians - we're Throughly Modern (tm) ! But have we advanced ?
Anyone out there have an answer to this?
Each flywheel gave steady 25 horespower and could double that for short kicks. Four would drive a car, but you could fit about 16 in an engine compartment (don't need engine, transmission, etc). That's 400 horsepower, and if you floor it you get 800 instantly! Also they would take you about 300 miles on a spin-up, which was accomplished by plugging the car into a wall socket, revving up the wheels with an electric motor - a charge would cost about 6 dollars of electricity.
Flywheels are better than batteries in a lot of ways. I'm glad to see they are finally being used for commercial applications. I haven't heard anything about the automobile flywheel guy since, but I'm sure his work won't be for nought. I'm equally sure car manufacturers and oil companies would stop him flat if he tried to market it though.
http://www.discover.com/search/index.html
You can search for it here with 'flywheel' as keyword - article name is 'Reinventing the Wheel'.
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Don't ask us, ask them. It's their problem.
I saw this figure mentioned in the boeing article as well. I don't understand where it comes from.
If an object sitting on the ground were to no longer feel the earth's gravitational pull, I don't think that it will fly up into the air. At first, it would just hover up against the ground. It would continue moving at ~1050mph (the tangential velocity of an object on the earth's surface) in the direction it was moving when the gravity stoped. It's like if you were to stand on the edge of a fast moving merry-go-round, and slip off. In the first few instants, you would have almost no speed relative to the ride, but you would continue going the same speed that you were before, in the same direction. If you were to continue flying away for some time, the greatest speed relative to the center of the ride would be the origional tangential speed. In the case of the earth, that's ~1050 mph.
Don't Bogart the fish sticks
See here: Rotary Converters Very cool info about 1900-era technology used to convert AC to DC power for use on the subway lines.
is a way kewl idea. Now about that Russian's anti-gravity bit that Boeing just picked up on, maybe we could just float around on the platform while we wait for the next train :)
Gizmos Gagets For Ninjas
Something the article does not state... A system like this can make a major difference in the power cost. Big commercial consumers pay based on their *peak* power draw (at least in CA). If you can reduce the peak draw, you change your costs for your entire usage. Cost/megawatt is significantly higer on a 600Amp peak circuit than it is on a 300Amp peak draw circuit. Major major difference, especially when multiplying that across the entire system.
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Jack not name, jack job!
When can I get this in my notebook? Combined with the Transmeta processor, I could probably get 30 hours out it instead of the 15 I get now!
Of course, it'd probably be a bit heavier, and if the flywheel broke, I wouldn't want my notebook to explode.
I was thinking about this the other day, when signing up for some similar site: I thought the WTC used to have their own ZIP code(s). I was too lazy to look them up to use them, but I wonder if they would have worked.
Out of morbid couriosity, has anybody researched using fast flywheels as weapons?
Table-ized A.I.
Did Heinlein's "The Roads Must Roll" roads use conveyer belts? That was a Nation-wide system of conveyer belts that moved people from city to city, I think. The story was about the engineers that maintained them. Heinlein was the only guy who ever made the work of (us) engineers sound exciting. ("I'll keep those transistors humming, if it's the last thing I do, golldarnit!") Maybe cuz he was one.
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oops, forgot the paragraphs:
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I seem to recall reading many years ago about testing on a bus that had a flywheel for regenerative breaking (in Scandinavia IIRC). The main problem with it was the gyroscope effect - trying to turn left or right creates a force at ninety degrees (ie up or down) and this proved too much for the suspension to deal with. Guess it's less of an issue with a subway train...?
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Amusingly enough, there is a subway in Cincinnati. Well, about three or four stations worth, anyway. They started construction on it in the 70s, ran out of money, and never completed it.
More details here.
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Whoever modded this "offtopic" has clearly never been on a New York City subway train.
"The Roads Must Roll"
by Robert Heinlein c1940
First scifi I know of mentioning moving sidewalks.
Great read if you can find it - it's in Science Fiction Hall of Fame volume I, but that's out of print.
If the subways was built with the stations placed higher than the track, then the trains would store some energy within them self.
Can someone do the Math please?
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Since the flywheel has a vertical axis... nothing. However, if the train corners quickly enough to cause a rollover, the flywheel would act to prevent the train from tipping.
Uh, last time I rode the NY subway, it was about 50 feet underneath the streats. I think you'd have to drop that truck from about 10,000 feet up to get it to penetrate that far underground... and then I suspect the truck would do a lot more damage than the flywheel.
They use DC for the same reasons that elevators use DC..smooth braking and acceleration.... Also, DC is necessary because as part of the power distribution there are 'breaks' in the third rail...and the rail actually uses the car to complete the break. An AC system would have to maintain phase scycronization for this to work.
I work for the Automation and Controls department of a very large company and we are exploring this technology. This is a very real problem, but the solution is pretty easy. Instead of using just one large flywheel, use many smaller ones.
There's an idea. Just make the smaller flywheels, the size of, um, TURNSTILES.....
What about the homeless people who rely on the subway heat vents in the winter?
They actually hang out near the steam vents so it's not really a problem. I live near a co-generation plant so there are a few extra citizens on cold winter days around here.
The thread reminded me that tomorrow I have to visit client's location. And that means waiting for the Q train on the 34th Street station. Dammit, standing there in the heat and watching a few hundred people suffering just like yourself. Truly depressing... a perfect fit for NYC.
... and I'm thinking about all these drunk people never going home, and some Guinness world records being set for party length and alcohol consumption.
They need to have this.
I'm not sure which of the noises you are talking about but I agree with you!
It's kinda like a forced upgrade
The new trains like those that operate on the 6 line actually drown out a lot of the track noise and have less jumpy/noisy ractions to track imperfections, right? However, whatever it is, their new turbine-like humming is very noisy, though it sounds more like something between 440+ and 512- Hz (near the key of B). The train ride is more comfortable, but I have found it hard to talk to girls because the noise drowns out their voices. The loud whine starts up as soon as the train accelerates and I have not heard it inside or outside the older trains (A, B and D, older 4 models, etc)
I hope someone notices the whine before the state spends millions replacing the trains that didn't have that 'feature.'
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In the city Arnhem (in the Netherlands), there are (amongst others) trolley's providing the public transport. All these trolleys have a flywheel storing their energy....so what's the big deal? It's nothing new, Arnhem has been doing it for years now!
And NO: no serious accidents were ever caused by the presence of the flywheel, no problems taking a sharp curve.
Story goes that the flywheel takes 5 mins. to come up to full speed.
No most of the heat really comes from the brakes. I live in Montreal and here we do not have A/C (it would really be a total waste since there's about 20 very hot summer days per year here). The subway is also much deeper in the ground than in NY (it usually takes you two big escalators to get to the subway cars, sometimes three). And on the very hot summer day, it is also very hot in the subway (almost unbearable in some station). In fact, some people fainted the very first year . They had to add fans to push air in so it get cooler.