Has the built-in web server, or will upload to FTP, and can save frames to a.avi archive for review later. Works with any video for windows compatible source (basically any cam that works with windows, including my GeForce video card's video in jack), and the author is continually updating it.
Acceleration isnt linear across the whole 1/4mile, so the G force cant be determined stictly from time averaged formulas, as the maximum will be more than the result. Thats why for drag races they give time AND top speed, it gives you a better idea how the car ran.
That formula should also be X1=X0+V0(t)+1/2A*T^2, where A is acceleration, same as g, X0 and V0 are initial position and velocity (both 0)
So assuming your 1/4mi to meter conversion is correct (Im lazy), 402.336M=1/2A*(81)=45.5A
Its been discussed off and on, details here, even though that site hasnt been updated in a while (last year by the looks of it). The movie rights for Ringworld have been sold, but as of yet not much has come of it. This was also brought up in the Slashdot interview with Niven.
Go read what a pebble bed reactor is and then you probably wouldnt ask that question. Pebble beds use pebbles of a radioactive fuel mixture thats part uranium and part mediator. Where most reactors use fuel rods of highly concentrated uranium, with mediator rods between them that are moved in and out of the core to control the reaction, these pebbled basically have the control rods built into the fuel. They are designed such that they increase power only if the coolant is flowing, thus they are inharently safe. If the temperature goes up, the reaction slows and the reactor gives off more heat than it creates. The only "safety device" would be a failure to turn off the coolant, in which case the coolant would be taking the heat away from the reactor anyway, but might heat some other areas of the plant unexpectedly (heat exchangers/turbines/etc).
After I fried it good (burned a pin clean off it), I took a 387 math co-proc and bent a few of the pins in one corner around a peice of string. Now it hangs from the rear-view mirror of my old car.
I wouldnt doubt it, the one Ive had as a desktop background for a while now is dated Nov27, 2000. The type of image is nothing new, but it could be using newer images than the one I have.... Another interesting image is the one of a sunset over europe.
If it wasnt already apparent from when they let pro Basketball players in, yeh... I had my shot at going in 2000 for swimming, it was alot of fun even though I didnt quite make it. But looking at other sports where pro athletes already being paid $$Millions per year for their "job" get the "honor" of going to the olympics makes me sick. Look at the dream team, or any of the other teams there this year. It is basically another NBA final. I would much rather watch College athletes who play for the game rather than the $$ be in the olympics.
OK, I know virtually nothing about VoIP, but I'm betting I'm right here... wouldn't that also block legitimate calls from others using VoIP phones?
No, because while they all use VoIP, they themselves are not (yet) interconnected. Even if they were, the only call switch that your phone should talk to is the one hosted by your provider, since it is the determining factor as to where calls go, and all voice packets are routed through their network anyways.
The individual providers still need a way to interconnect to all other providers, and currently the only way to do that is via POPs (points of presence) and SS7 trunks to the POTs network. Generally once traffic is determined to not be on the CLEC's local network, its passed out to whoever they connect to to handle outbound routing, be it VoIP or not. I doubt any serious LEC would use the internet as a major interconnect with another provider. The security risk alone is too much of a risk.
Also note that not all providers currently use the same protocol (as has been mentioned in other posts), so even if someone spoofed a call from your provider, they would have to know how to talk to your phone, be it MGCP or SIP or something else.
Just because your phone "has an world reachable IP address" doesnt mean it is wide open to attacks. I think the most serious issue to be dealt with will be DOS attacks, since most IVoIP (internet VoIP, ala Vonage.. as opposed to internal VoIP on private networks) cannot control their QOS between customer and callswitch.
there's no downside, and the upside is you can't get trojans, you don't have to be as uptodate in security
Hope your not in the networking/it/security field. Trojans can and are immune to firewalls. By the simple definition: a Trojan is a program appearing to be a game or other executable desirable to whoever gets it, that when run does something other than the intended result. A firewall will not stop you from getting a trojan, and a trojan can do plenty of malicious things once run whether or not you have a firewall. If you dont stay "as uptodate in security", the trojan will have full reign on your computer until you update your security by installing a virus scanner update that can catch and remove it (unless your virus scanner was eaten by the trojan itself, it does happen). A firewall reduces the chance you will have your computer compromised from services your wonderfull Microsoft OS leaves on by default with all of their wonderfull exploitable bugs (worms: a virus spread from computer to computer without user interaction), but in the case of a Trojan, it is almost always user error from opening a forwarded email attachment. Once mal-ware (virus or otherwise) is running, it can open outgoing connections through your firewall to let whoever wants to use it in.
This is why viruses/worms/trojans/etc spread so bad. People do not understand what is going on, even if they think they do. A firewall is only part of a solution, same as a virus scanner is only another part. Running only one or the other will leave you wide open to attack if you do not know 100% what is going on. All it takes is reading the wrong email in an unpatched email program, or viewing a corrupt webpage in a vulnerable web browser, or even leaving your non-firewalled machine up when someone/somevirus portscans it looking for the latest exploit on a service you are running an exploitable version of knowingly or not.
You dont understand TCP and firewalls do you? IE is not a webserver, and unless your machine is compromised to act as such, or you set one up yourself (apache or IIS), you do not even use port 80. Web requests are sent via some unprivlidged high-level port (well above 1024, usually close to the high end 65535), targeting port 80 of the server. The server responds by sending data back down the pipe created by the request. In fact, your NAT firewall does not need ANY ports open for incoming requests for simple web browsing. The ONLY time open ports are needed is for services you wish to provide to the outside world to use, such as webcam, ftpserver, webserv, email server, etc. and some games that are too dumb/old to work with NAT. IE is vulnerable to sites you go to and content you view with it, with or without a firewall. XP itself has other services actively listening on other ports (by default), and it is those services that are generally vulnerable if not turned off or firewalled. SP2 works to fix/turn off/firewall those vulnerablities, and patch IE so that something as simple as viewing a corrupted web page will not infect the whole PC. After using a known vunerability in IE a while back to make a demo page that by viewing would write a file to the viewer's C: drive, and launch 4 different apps, I switched 100% to opera and convinced several other people to as well. The same vunerability was one MS declared not their problem and as far as I know is still a bug in IE (deals with what security zone history pages are treated).
I can always tell when someone in my office is about to get a call on their cellphone because of the noise coming out of my speakers from it. They start clicking and buzzing about a second before the phone starts to ring.
As a side note, cordless phones in Colocations do the same if the tech is close to an operational circuit/equipment. Was working with a CO tech once on a problematic T1 (problem was in something in the Colo), and as soon as I started a Bert pattern, I could hear it over the phone (CO tech had just physically changed a MUX card and was standing there looking at it while on a cordless phone talking to me). It made a nice digitized/buzzing type noise.
Its interesting if you think about it. What if the book's title was a phone number? Thats essentially what Penguin did when they titled it Katie.com. They named the book with something immediatly identifiable as the address of something. As mentioned in another post further up, it would be the same as titling it 1600 Pennsylvania Ave Washington, DC and then threatning the Whitehouse because all the fan mail for the book went there instead of to the publisher. Its their own fault for titling it a web address they didnt own. If they titled a book with my phone number, I would have a right to sue on the grounds of defamation/harrasment. Same as someone posting the number in a public place with "for a good time call:", or if a buisness decided to print my number on an ad instead of their own, whether an attempt to force me to give them the number or not. The public posting of that information associates me with whatever else is posted with it, and without my permission to do so or checking to see if it really applies to me it can be considered libel. If the book was about how a young girl was sexually assaulted because of her activity and the activity of her attacker on an online chat board, and the title of the book "happened" to be the web address of an online chat board, does it not defame said address? Would people not associate the negativity of the chat board as depicted in the book (I dont see how it would be portrayed in any positive way) with the chat site that the title goes to?
They could go so far as to accuse Penguin of extortion, "hand over your domain or it will only get worse" : "pay us more or we break more fingers". Of course, the RIAA is doing the same thing and getting away with it: "pay us $3000 because we have 'proof' 'you' did something or we will sue you for $XXX000 and you know we will win if you can even afford to go to court."
Duno where you shop, but I just finished upgrading by brother's computer to a A64 3500+ for less than $1g. As for the upgrade: new CPU (3500+ 939pin), MBoard(Abit AV8), Ram (1G), Power supply(420W, not a cheap one), and videocard(fx5700). The only thing used from the old PC was the case and drives. The Abit board has everything onboard including Gig-E, Sound (digital in/out, 5.1 surroud, etc), 4 USBs built in, 2 more headers for USB2.0 for 4 more USB ports, 3firewires, SATA w/raid, udma133, just about everything needed other than a videocard (which should be seperate anyways). Not the most expensive machine made, but it leaves the door open to upgrade the CPU to a faster 64 or 64FX CPU when they get cheaper, more ram, better vid card (already gets 30+ fps in just about any current game) and SATA or UDMA133 drives (still running a UDMA100).
For Thousands and thousands you must be droping in the top-of-the-line AMD 64FX with the fastest GPU available, or throwing a bunch into some overpriced riced-out case mods. The AMD 64 3000+/3500+ combos are not that expensive.
but I have a Technics one similar to that that CAN and does have track selection. It uses a red LED to sense blank spots on the record, and hitting the fwd/back buttons lifts the needle arm and moves it to the next blank area. There are several on ebay most of the time, look for Technics SL-D series, or Technics Linear Turntable.
Im not sure if it has a remote input (its in a closet somewhere currently) but I dont see why it wouldnt, since all the functions are electronic buttons on the front anyway.
The physical format WILL change! As Im sure there are plenty of moro^?^?^?^?people out there that go out and buy DVD's and try to play them in their car's cd player or old home stereo deck and wonder why it doesnt work. Keeping the same size media for another video format will only confuse people more. "Is the disc Im holding a CD, DVD, HDVD, BlueRay DVD, playstation/PS2 disc, XBox disc? Can my CD/DVD/8track play it?".
Seriously though, as for what it will be, I forsee a return to the Laserdisc format! Imagine a disc the size of a laserdisc, but with the storage density of DVD, or even the soon to be released BlueRay/BlueLaser DVD format! Add a few more layers and I bet you could get the disc up to 1TB or more!! That should be enough to cover HDTV video and whatever new formats come out, or enough to pack about 50 DVDs or 200VCDs on one disc! I for one am excited in waiting on the industry to loop back around to the 80's and start pumping out more Laserdiscs!!!
Most of the field techs I work with have nextel phones. The reception sucks for all of them in the 4 market areas across the US I work in. Texas, Georigia, Denver, they all have crappy reception. Trying to call a tech thats got a Nextel normally requires 2 calls, the first either goes into their voicemail or gives some Nextel error message, the second usually goes through if they have a signal. And when porting (LNP) phone numbers for our customers (I work for a CLEC), the techs cant test the porting with their cellphones normally, because Nextel is one of the slowest carriers to update their translations, thus the test calls from their phones usually route to the old provider's phone block rather than the one we installed and just ported the numbers to.
The "cheapo" power supplies were exactly that: cheap. The store sold them for $19, simply so they could advertise having power supplies for $19, matching/beating what other local stores sold them for as well. Its not that they would inevitably die, they can last a long time on older systems. Its that when used on more powerfull systems, such as what these customer's would purchase, they simply did not provide the power needed. Trust me, we would much rather have sold them the more powerfull high-quality Sparkle or HEC PS as those had a higher profit margin and guaranteed less warantee work, and we would warn them about the PS they selected. But alot of times the customer was stubborn and as you know, "customer is always right". Those customers would be back for a new one in a day or two. It got to the point where the store only offered a DOA warrantee on them (yes, customers were plenty warned about that as well), because customers would go for the cheap ones and come back for replacements repeatedly.
As a side note, the cheapo PS's I mention were normally pulled from cases we used to build higher end PC's. Since we knew they wouldnt last long with such systems, we replaced them with better quality ones. Tip: dont buy a case/PS combo and expect to use the PS, unless you know what specific PS you are getting.
One of the best selling points was having the customer hold the "300W" cheap PS with a true 300watt Sparkle/HEC. The weight difference alone makes you feel more comfortable with the better quality one.
Most common failure on PS's: exploding capacitors. Symptom: turn on your PC one day and hear a loud POP and smell smoke. If you open the PS, you will find the Capicitor Cap rattling around inside with bits of paper and foil.
Having worked as a computer repair tech, you would be supprised at the number of people that would buy barebone kits from us one day, and be back later that day or the next saying it wouldn't work. Most of the time it was that exact problem... screwing the Mobo to the case without standoffs. Luckily with the ATX boards we used, it tended to short the power jumper and the power connector, so pushing the power button didnt do anything. The other fun ones to fix were the ones where they painted the CPU in thermal grease (as in, everything under the heatsink got a good coat, enough to fill the gap) and complained that it would only work for a few minutes at a time (hated scraping that crap off), and the ones that would buy the most expensive CPU/Mobo, but get the cheapest power supply or buy a case w/PS and bring it back dead within the week. Most common non-software/C-K-I computer failure is dead PS.
For not knowing about the recent Akamai attacks, you must have just joined/. or been hiding in a cave for the past few months. Basically, a bunch of the recent worms that have been going around have a client built into them for targeted DOS attacks, and most of them target various servers in Akamai's network. For not knowing who Akamai is, you are just lazy. Try www.akamai.com. Akamai is a large hosting company (they estimate 15% of ALL internet traffic goes through them), hosting sites such as Microsoft. As for why the attack? Why does any site get attacked? Akamai is also a very large target, this attack just happened to disrupt service to 2% of its customers for a short time. And since you probably didnt RTFA, it was due to their DNS implementation. The rest of the article read like an ad for a new beast of a security server, and the article as a whole was rather uninformative and boring. The "Akamai got attacked" part was only in the first few lines.
What is needed is a PBX or other similar device that can play with call signaling, and phone service that allows you to control call signaling (ie: digital service). This can be CAS/PRI/whatever over ISDN/T1/T3/whatever. The callerID is injected into the call setup signaling. It is up to the carrier to validate this and reject it, replace it, or pass it along. It is a feature of digital lines, as customers with digital systems may have 24 channels (up to 24 lines active at any one time) but 2400 phone numbers, and might want to make calls "from" different numbers. The only way to do this is to either have multiple trunk-groups (expensive from the billing side of things), or be allowed to set the outbound caller ID info on a per-call basis, as all calls go out over the same trunk-group, which has only 1 "real" phone number (the other 2399 are DID's, direct inward dial, and are used by the PBX to route a call to someone's specific extension, usually by the last 4 digits of the number) that would otherwise showup in the caller ID.
Then this sounds like a simple problem to fix to me: The phone companies would simply have to check that the phone number reported for caller id matches one that they have registered for the person who is billed. If not, they can give an error message or something. Or did I misunderstand something?
You misunderstand how caller ID works. On traditional PSTN lines, when you make an outbound call your callerID information is looked up in a database (maintained by your carrier) when it hits the callswitch in the Central Office (CO). This is tacked onto the call and is sent with the rest of the call routing information to the destination via the signalling lines of SS7 trunks (note: SS7 splits voice traffic and call signaling between physically seperate routes/lines, meaning voice traffic is not transmitted or routed until the call is established, eliminating the effectiveness of the old blue/black box dialers.). When it reaches the last CO and goes out to a Remote Terminal (RT), the RT sends the ring tones to your phone over the local loop copper (for PSTN, more on that in a sec). Mixed in with the ring tones is a modem-sounding signal that your Caller ID box intercepts and decodes to get the caller ID info. Since this data is stored by the phone company, it is hard to spoof.
With digital phone systems, the signaling goes all the way to the switch itself, allowing the PBX more control over the call. ISDN and CAS have provisions to inject CallerID information into the outbound calls. Whether or not this information is passed through the CO call switch or is replaced is up to the carrier. Generally since its less stuff for the carrier to deal with, they let it pass.
I-VoIP (internet VoIP) carriers need the software to be able to route calls back to their switch, and in doing so, the software basically becomes a software based digital PBX. So along with routing information, the CallerID info can be passed into the signaling.
Another issue is that caller-ID can be any alpha-numeric string, with a few special characters thrown in as well. Because of this, you can have your CallerID Name set to show up as a random phone number (867-5309?), and unless someone actually checks the number portion of the CaID against what shows up in the display, they probably wont notice, and if it is noticed, it would look like 2 different phone numbers and probably just confuse the person receiving the call.
Tm
Rotational speed and linear velocity
on
Homemade CD Shooter?
·
· Score: 2, Interesting
are what you need for a good CD launch. Without the CD spinning, it will just flop around and go nowhere. With a good spin on it, it will fly somewhat straight, with a slight curve to its flight path depending on launch angle. High linear speed will at least stretch that out if not eleminate it while on its way to the target.
My vision is of a CD spindle looking clip that loads the "ammo" from the top (gravity fed), with a bolt like thin sliding arm with a center spindle, to push the discs forward one at a time while holding the rest of the stack out of the way. When the trigger is pulled, the arm slides forward to launch a disc, and releases the next disc in the stack onto the top of the chamber. As the trigger is released the disc falls into the chamber where rotors on the sides of it, or the spindle on the arm spin the disc up to speed. When ready, the trigger is pulled, pushing the arm and spindle forward to the launching wheels. When the disc gets to the launching wheels, the spindle drops out of the way. The wheels themselves are rubber, touching each other, and spinning in opposite directions, such that when a disc is pushed into them, they spit it out rather quickly. They should be near the center of the disc on top and bottom of the track the disc slides on, offsetslighly to maintain the rotation on the disc itself, but keep the path of the disc somewhat straight out the end.
just a thought, dont look at me if you try to actually build somthing from this and hurtyourself.
Slashdot Mirror
Yeh, look at Duke Nukem forever....
tm
http://sourceforge.net/projects/dorgem/
Has the built-in web server, or will upload to FTP, and can save frames to a .avi archive for review later. Works with any video for windows compatible source (basically any cam that works with windows, including my GeForce video card's video in jack), and the author is continually updating it.
Tm
That formula should also be X1=X0+V0(t)+1/2A*T^2, where A is acceleration, same as g, X0 and V0 are initial position and velocity (both 0)
So assuming your 1/4mi to meter conversion is correct (Im lazy), 402.336M=1/2A*(81)=45.5A
or 8.84M/S^2, ~.9g
tm
Tm
Tm
Tm
Tm
Tm
some use an emulator plugin, but alot just use shockwave/flash.
Tm
No, because while they all use VoIP, they themselves are not (yet) interconnected. Even if they were, the only call switch that your phone should talk to is the one hosted by your provider, since it is the determining factor as to where calls go, and all voice packets are routed through their network anyways.
The individual providers still need a way to interconnect to all other providers, and currently the only way to do that is via POPs (points of presence) and SS7 trunks to the POTs network. Generally once traffic is determined to not be on the CLEC's local network, its passed out to whoever they connect to to handle outbound routing, be it VoIP or not. I doubt any serious LEC would use the internet as a major interconnect with another provider. The security risk alone is too much of a risk.
Also note that not all providers currently use the same protocol (as has been mentioned in other posts), so even if someone spoofed a call from your provider, they would have to know how to talk to your phone, be it MGCP or SIP or something else.
Just because your phone "has an world reachable IP address" doesnt mean it is wide open to attacks. I think the most serious issue to be dealt with will be DOS attacks, since most IVoIP (internet VoIP, ala Vonage.. as opposed to internal VoIP on private networks) cannot control their QOS between customer and callswitch.
tm
Hope your not in the networking/it/security field. Trojans can and are immune to firewalls. By the simple definition: a Trojan is a program appearing to be a game or other executable desirable to whoever gets it, that when run does something other than the intended result. A firewall will not stop you from getting a trojan, and a trojan can do plenty of malicious things once run whether or not you have a firewall. If you dont stay "as uptodate in security", the trojan will have full reign on your computer until you update your security by installing a virus scanner update that can catch and remove it (unless your virus scanner was eaten by the trojan itself, it does happen). A firewall reduces the chance you will have your computer compromised from services your wonderfull Microsoft OS leaves on by default with all of their wonderfull exploitable bugs (worms: a virus spread from computer to computer without user interaction), but in the case of a Trojan, it is almost always user error from opening a forwarded email attachment. Once mal-ware (virus or otherwise) is running, it can open outgoing connections through your firewall to let whoever wants to use it in.
This is why viruses/worms/trojans/etc spread so bad. People do not understand what is going on, even if they think they do. A firewall is only part of a solution, same as a virus scanner is only another part. Running only one or the other will leave you wide open to attack if you do not know 100% what is going on. All it takes is reading the wrong email in an unpatched email program, or viewing a corrupt webpage in a vulnerable web browser, or even leaving your non-firewalled machine up when someone/somevirus portscans it looking for the latest exploit on a service you are running an exploitable version of knowingly or not.
Tm
Tm
As a side note, cordless phones in Colocations do the same if the tech is close to an operational circuit/equipment. Was working with a CO tech once on a problematic T1 (problem was in something in the Colo), and as soon as I started a Bert pattern, I could hear it over the phone (CO tech had just physically changed a MUX card and was standing there looking at it while on a cordless phone talking to me). It made a nice digitized/buzzing type noise.
Tm
They could go so far as to accuse Penguin of extortion, "hand over your domain or it will only get worse" : "pay us more or we break more fingers". Of course, the RIAA is doing the same thing and getting away with it: "pay us $3000 because we have 'proof' 'you' did something or we will sue you for $XXX000 and you know we will win if you can even afford to go to court."
Tm
For Thousands and thousands you must be droping in the top-of-the-line AMD 64FX with the fastest GPU available, or throwing a bunch into some overpriced riced-out case mods. The AMD 64 3000+/3500+ combos are not that expensive.
Tm
Sure beats the hell out of his old SlotA-533 :)
Im not sure if it has a remote input (its in a closet somewhere currently) but I dont see why it wouldnt, since all the functions are electronic buttons on the front anyway.
Tm
Try this
Im tired of it too...
Tm
Seriously though, as for what it will be, I forsee a return to the Laserdisc format! Imagine a disc the size of a laserdisc, but with the storage density of DVD, or even the soon to be released BlueRay/BlueLaser DVD format! Add a few more layers and I bet you could get the disc up to 1TB or more!! That should be enough to cover HDTV video and whatever new formats come out, or enough to pack about 50 DVDs or 200VCDs on one disc! I for one am excited in waiting on the industry to loop back around to the 80's and start pumping out more Laserdiscs!!!
Tm
Tm
As a side note, the cheapo PS's I mention were normally pulled from cases we used to build higher end PC's. Since we knew they wouldnt last long with such systems, we replaced them with better quality ones. Tip: dont buy a case/PS combo and expect to use the PS, unless you know what specific PS you are getting.
One of the best selling points was having the customer hold the "300W" cheap PS with a true 300watt Sparkle/HEC. The weight difference alone makes you feel more comfortable with the better quality one.
Most common failure on PS's: exploding capacitors. Symptom: turn on your PC one day and hear a loud POP and smell smoke. If you open the PS, you will find the Capicitor Cap rattling around inside with bits of paper and foil.
Tm
Tm
tm
TM
You misunderstand how caller ID works. On traditional PSTN lines, when you make an outbound call your callerID information is looked up in a database (maintained by your carrier) when it hits the callswitch in the Central Office (CO). This is tacked onto the call and is sent with the rest of the call routing information to the destination via the signalling lines of SS7 trunks (note: SS7 splits voice traffic and call signaling between physically seperate routes/lines, meaning voice traffic is not transmitted or routed until the call is established, eliminating the effectiveness of the old blue/black box dialers.). When it reaches the last CO and goes out to a Remote Terminal (RT), the RT sends the ring tones to your phone over the local loop copper (for PSTN, more on that in a sec). Mixed in with the ring tones is a modem-sounding signal that your Caller ID box intercepts and decodes to get the caller ID info. Since this data is stored by the phone company, it is hard to spoof.
With digital phone systems, the signaling goes all the way to the switch itself, allowing the PBX more control over the call. ISDN and CAS have provisions to inject CallerID information into the outbound calls. Whether or not this information is passed through the CO call switch or is replaced is up to the carrier. Generally since its less stuff for the carrier to deal with, they let it pass. I-VoIP (internet VoIP) carriers need the software to be able to route calls back to their switch, and in doing so, the software basically becomes a software based digital PBX. So along with routing information, the CallerID info can be passed into the signaling.
Another issue is that caller-ID can be any alpha-numeric string, with a few special characters thrown in as well. Because of this, you can have your CallerID Name set to show up as a random phone number (867-5309?), and unless someone actually checks the number portion of the CaID against what shows up in the display, they probably wont notice, and if it is noticed, it would look like 2 different phone numbers and probably just confuse the person receiving the call.
Tm
My vision is of a CD spindle looking clip that loads the "ammo" from the top (gravity fed), with a bolt like thin sliding arm with a center spindle, to push the discs forward one at a time while holding the rest of the stack out of the way. When the trigger is pulled, the arm slides forward to launch a disc, and releases the next disc in the stack onto the top of the chamber. As the trigger is released the disc falls into the chamber where rotors on the sides of it, or the spindle on the arm spin the disc up to speed. When ready, the trigger is pulled, pushing the arm and spindle forward to the launching wheels. When the disc gets to the launching wheels, the spindle drops out of the way. The wheels themselves are rubber, touching each other, and spinning in opposite directions, such that when a disc is pushed into them, they spit it out rather quickly. They should be near the center of the disc on top and bottom of the track the disc slides on, offsetslighly to maintain the rotation on the disc itself, but keep the path of the disc somewhat straight out the end.
just a thought, dont look at me if you try to actually build somthing from this and hurtyourself.
tm