Ultimately, the stopping force of a car is limited by the frictional force of the tires against the pavement. A car with cheap tires will take longer to stop than a car with sticky race tires. Same thing for dry conditions vs. rain or snow.
Since the tires are the limiting factor, we want to maximize them, so the static friction of a rolling tire is needed. We don't care about the brakes sliding - they don't apply the force to the pavement!
--- You wrote: digg has an interesting way of doing things. It would be like a community moderated slashdot, to judge what is shown on the front page --- End of quote ---
My lap times (autocross and road racing) improved a good deal when I put a harness into my car. It was so much eaiser to feel what the car was doing when you're firmly attached to the seat.
Pro hockey players tend to skate barefoot (no socks) for much the same reasons - less flexing in the skate due to better contact = better feel on the ice.
Re:VW Golf with 50hp Boost
on
Hack Your Car
·
· Score: 1
It's called raising the boost pressure, which is why you only see such high gains over stock on forced induction engines.
For NA engines with only intake and catback, expect gains of 5% maybe, not 10-20%.
Do you really think mil stuff is built for comfort?
And that the performance couldn't be as good as commercial stuff? A lot of your engines are shared between commercial and military use. See how many commerical cargo planes used the same J56 engines the C-130 series uses.
Military items are designed for durability and reliability. Most military engines, be they land or aircraft, are derated by about half to make sure it doesn't break when inhaling desert sand, heavy rain, and small animals. The J130, designed for about 6,000 shaft HP, is rated at 4,000 on the C-130.
Noise reduction on jets has costs, in efficiency and performance. Your cushy ride in a civvy humvee is because you don't need the stiffness to keep stable when firing.50" machine guns or TOW missiles off the back. That soft stuff (larger rubber bushings, etc) doesn't wear so well under hard offroad use, either.
Milspec works to a completely different design agenda. Every requirement is asked, "how does this support the war function?"
"They claim the battery has 50,000 Wh. My Dell battery has 66 Wh, so it would only take 758 such batteries (about $80K before any discounts) to power the tzero. Maybe the 6800 batteries figure actually refers to individual cells?"
They're hooking up sets of the batteries in series to increase voltage. In series, the Wh don't add, they stay the same. So, maybe they're hooking up 8 sets of 850 batteries to get 50 kWh @ 12V each = 96V total pack voltage.
"It's going to be a couple years before Midas can do a $99 break job on a machine with regenerative breaking."
First off, unless you were trying out a pun, it's a _brake_ job.
And Midas will never replace any regenerative brakes. The regenerative brake is also known as the electric motor - you're just using the drivetrain to run it as a generator.
If anything, regenerative braking _saves_ the brake pads since they aren't being used as often.
Please tell me how I can get anywhere close to 27 mpg doing the kind of driving they were doing. When I autocross, speeds ranging 15-60mph, I'm probably getting 15-20mpg. Road racing brings it to about 10 mpg (this is a V6 Firebird) with speed ranging from 40-100mph on the course.
Let's do the math for the 250 mile drive, assuming it used all 50 kW-h of juice. Conversions are from http://www.eia.doe.gov/kids/unitsindex.html
50kW-h x 3,412 BTU/kW-h = 170,600 BTU 1 gal gas = 124,000 BTU
So, 250 miles on 1.37 gal gas = 181 mpg. Not too shabby, eh?
"At 27 miles per gallon equivalent We have petrol cars which are more efficient than this, but I don't believe that anything capable of accelerating that fast does 27mpg."
Having been up and down Mt. Washington, including a trip in our college's solar-electric car, I'm not sure that the Segway could make it down safely.
With no brakes and only a small battery pack to soak up regenerative braking, I'm fairly sure a trip back down the mountain would result in the scooter being reduced to a smoky, overheated ruin without very frequent stops with enough time to let it cool down.
Our solar car, with six car batteries hooked up in series, still got kind of warm even though we weren't near the car's full range. $0.25 worth of electricity on the way up, gained back $0.15 on the trip down with the regen brakes. Figure at least a nickel's worth of heat generation in the batteries and electrics on the trip down..
I think it's safe to say he packed the scooter into the back of the Beetle clown car for the trip back..
But can selective pressure also have an effect on the mutuation rate?
In other words, will increased stress in the organism (through environmental change or whatnot), cause the organism to increase its mutation rate as a possible response?
Thought I'd seen something on this, but too lazy to look for a cite.
--- You wrote: --- That being said, I think LyricFind and the MPA should sit down and work out a licensing agreement with each other to work out a deal that benefits all three parites involved (Songwriters, LyricFind and consumers). --- End of quote ---
This already happened once. www.lyrics.ch (as mentioned below a couple times) was the best lyrics search engine there was several years back. Raided and shut down by the Harry Fox Agency, a companion to the MPA.
It cooperated, and came back up again in partnership with the HFA. Completely unuseable. Nasty Java applet that you couldn't cut and paste, and would blank the lyrics from the screen after a short time (about 30 seconds, not even the length of the song!). Traffic went to zero as people looked for alternatives.
With the attitude of the copyright holders, I don't see any partnership ending any other way.
Old, but a good example IMO. One of the first programs to provide entrancing feedback to a sound input. Probably provided a good driver for the inclusion of plugins in most all music players.
Slashdot Mirror
Doesn't something seem wrong when you come up with one person doing 31 _million_ jumping jacks a year while windows is booting?
If I tried to do 113 jumping jacks a second for an entire year, I think waiting for windows to boot would be the lessor of two health crises.
For better math, how about 113 (jumping jacks/reboot) * 365 (days/year)* 2 (reboots/day)?
But the value of the house offsets that, unless your mortgage is underwater to the tune of $120k
MIBL - Mind Blade?
-1, Wrong ?
Ultimately, the stopping force of a car is limited by the frictional force of the tires against the pavement. A car with cheap tires will take longer to stop than a car with sticky race tires. Same thing for dry conditions vs. rain or snow.
Since the tires are the limiting factor, we want to maximize them, so the static friction of a rolling tire is needed. We don't care about the brakes sliding - they don't apply the force to the pavement!
That probably just gets people to aim a little better...
--- You wrote:
digg has an interesting way of doing things. It would be like a community moderated slashdot, to judge what is shown on the front page
--- End of quote ---
You mean like K5?
--- You wrote:
;-)
Hell, I'd just be happy if the "100% coverage" actually ever gave me a signal in my room.
--- End of quote ---
River Cluster or the Choates?
I'm still waiting for "-1, Wrong" to make the list of mod tags.
I'll make it easier half way down the page.. golden[shower] child.
Umm, The Golden Child is an 80's Eddie Murphy movie.
You are truly the man with a hammer, and everything looks like nails to you.
One needs to rub three things togther to get a flat surface. If you use just two, you end up with one concave, one convex..
My lap times (autocross and road racing) improved a good deal when I put a harness into my car. It was so much eaiser to feel what the car was doing when you're firmly attached to the seat.
Pro hockey players tend to skate barefoot (no socks) for much the same reasons - less flexing in the skate due to better contact = better feel on the ice.
It's called raising the boost pressure, which is why you only see such high gains over stock on forced induction engines.
For NA engines with only intake and catback, expect gains of 5% maybe, not 10-20%.
Do you really think mil stuff is built for comfort?
.50" machine guns or TOW missiles off the back. That soft stuff (larger rubber bushings, etc) doesn't wear so well under hard offroad use, either.
And that the performance couldn't be as good as commercial stuff? A lot of your engines are shared between commercial and military use. See how many commerical cargo planes used the same J56 engines the C-130 series uses.
Military items are designed for durability and reliability. Most military engines, be they land or aircraft, are derated by about half to make sure it doesn't break when inhaling desert sand, heavy rain, and small animals. The J130, designed for about 6,000 shaft HP, is rated at 4,000 on the C-130.
Noise reduction on jets has costs, in efficiency and performance. Your cushy ride in a civvy humvee is because you don't need the stiffness to keep stable when firing
Milspec works to a completely different design agenda. Every requirement is asked, "how does this support the war function?"
Yes, but how about among dilbert.com readers?
The engineering school has been wired with 100Mbit since about '97..
"They claim the battery has 50,000 Wh. My Dell battery has 66 Wh, so it would only take 758 such batteries (about $80K before any discounts) to power the tzero. Maybe the 6800 batteries figure actually refers to individual cells?"
They're hooking up sets of the batteries in series to increase voltage. In series, the Wh don't add, they stay the same. So, maybe they're hooking up 8 sets of 850 batteries to get 50 kWh @ 12V each = 96V total pack voltage.
"You can also hook the tzero up to a wind plant"
Hey, so what if I put a windmill on the car to charge the batteries while I was driving?
(just kidding, former EV builder repeating an often-asked question)
"It's going to be a couple years before Midas can do a $99 break job on a machine with regenerative breaking."
First off, unless you were trying out a pun, it's a _brake_ job.
And Midas will never replace any regenerative brakes. The regenerative brake is also known as the electric motor - you're just using the drivetrain to run it as a generator.
If anything, regenerative braking _saves_ the brake pads since they aren't being used as often.
Please tell me how I can get anywhere close to 27 mpg doing the kind of driving they were doing. When I autocross, speeds ranging 15-60mph, I'm probably getting 15-20mpg. Road racing brings it to about 10 mpg (this is a V6 Firebird) with speed ranging from 40-100mph on the course.
Let's do the math for the 250 mile drive, assuming it used all 50 kW-h of juice. Conversions are from http://www.eia.doe.gov/kids/unitsindex.html
50kW-h x 3,412 BTU/kW-h = 170,600 BTU
1 gal gas = 124,000 BTU
So, 250 miles on 1.37 gal gas = 181 mpg. Not too shabby, eh?
"At 27 miles per gallon equivalent
We have petrol cars which are more efficient than this, but I don't believe that anything capable of accelerating that fast does 27mpg."
"'d also consider some kind of IR based ranging device that would make sure the person's head is within a certain location to ensure.."
As in, not up their ass?
Having been up and down Mt. Washington, including a trip in our college's solar-electric car, I'm not sure that the Segway could make it down safely.
With no brakes and only a small battery pack to soak up regenerative braking, I'm fairly sure a trip back down the mountain would result in the scooter being reduced to a smoky, overheated ruin without very frequent stops with enough time to let it cool down.
Our solar car, with six car batteries hooked up in series, still got kind of warm even though we weren't near the car's full range. $0.25 worth of electricity on the way up, gained back $0.15 on the trip down with the regen brakes. Figure at least a nickel's worth of heat generation in the batteries and electrics on the trip down..
I think it's safe to say he packed the scooter into the back of the Beetle clown car for the trip back..
You just try explaining that you grew up in Beaver County, PA, just north of Beaver Falls, in a small township called Big Beaver.
But can selective pressure also have an effect on the mutuation rate?
In other words, will increased stress in the organism (through environmental change or whatnot), cause the organism to increase its mutation rate as a possible response?
Thought I'd seen something on this, but too lazy to look for a cite.
--- You wrote: ---
That being said, I think LyricFind and the MPA should sit down and work out a licensing agreement with each other to work out a deal that benefits all three parites involved (Songwriters, LyricFind and consumers).
--- End of quote ---
This already happened once. www.lyrics.ch (as mentioned below a couple times) was the best lyrics search engine there was several years back. Raided and shut down by the Harry Fox Agency, a companion to the MPA.
It cooperated, and came back up again in partnership with the HFA. Completely unuseable. Nasty Java applet that you couldn't cut and paste, and would blank the lyrics from the screen after a short time (about 30 seconds, not even the length of the song!). Traffic went to zero as people looked for alternatives.
With the attitude of the copyright holders, I don't see any partnership ending any other way.
Old, but a good example IMO. One of the first programs to provide entrancing feedback to a sound input. Probably provided a good driver for the inclusion of plugins in most all music players.