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/cgi-bin/YaBB.pl General Category >> The Cafe >> The defnition of acceleration /cgi-bin/YaBB.pl?num=1446519992 Message started by Kris01 on 11/02/15 at 19:06:32 |
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Title: The defnition of acceleration Post by Kris01 on 11/02/15 at 19:06:32 I don't know how accurate (or current) these facts are but it is pretty amazing! One top fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows of stock cars at the Daytona 500. Under full throttle, a dragster engine consumes 1-1/2 gallons of nitro methane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced. A stock Dodge Hemi V8 engine cannot produce enough power to drive the dragster's supercharger. With 3,000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition. Cylinders run on the verge of hydraulic lock at full throttle. At the stoichiometric (stoichiometry: methodology and technology by which quantities of reactants and products in chemical reactions are determined) 1.7:1 air/fuel mixture of nitro methane, the flame front temperature measures 7,050 deg F. Nitro methane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases. Dual magnetos supply 44 amps to each spark plug. This is the output of an arc welder in each cylinder. Spark plug electrodes are totally consumed during a pass. After halfway, the engine is dieseling from compression, plus the glow of exhaust valves at 1,400 deg F. The engine can only be shut down by cutting the fuel flow. If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half. In order to exceed 300 mph in 4.5 seconds, dragsters must accelerate an average of over 4G's. In order to reach 200 mph (well before half-track), the launch acceleration approaches 8G's. Dragsters reach over 300 miles per hour before you have completed reading this sentence. Top fuel engines turn approximately 540 revolutions from light to light! Including the burnout, the engine must only survive 900 revolutions under load. The redline is actually quite high at 9,500 rpm. Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs an estimate $1,000.00 per second. The current top fuel dragster elapsed time record is 4.441 seconds for the quarter mile (10/05/03, Tony Schumacher). The top speed record is 333.00 mph (533 km/h) as measured over the last 66' of the run (09/28/03 Doug Kalitta). Putting all of this into prespective: You are driving the average $140,000 Lingenfelter "twin-turbo" powered Corvette Z06. Over a mile up the road, a top fuel dragster is staged and ready to launch down a quarter mile strip as you pass. You have the advantage of a flying start. You run the 'Vette hard up through the gears and blast across the starting line and pass the dragster at an honest 200 mph. The "tree" goes green for both of you at that moment. The draster launches and starts after you. You keep your foot down hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds, the dragster catches and passes you. He beats you to the finish line, a quarter mile away from where you just passed him. Think about it, from a standing start, the dragster had spotted you 200 mph and not only caught, but nearly blasted you off the road when he passed you within a mere 1,320 foot long race course. ... and that my friend, is ACCELERATION! |
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Title: Re: The defnition of acceleration Post by Dave on 11/03/15 at 03:21:51 I have seen this before.....and it is pretty amazing. I do believe that the following two statements are contradictory, and that the fuel mixture is not compressed to a "near-solid" - but rather to a "near liquid" form. With 3,000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition. Cylinders run on the verge of hydraulic lock at full throttle. Change that "near-solid" to "near-liquid".....and I think it all is plausible, and incredible. |
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Title: Re: The defnition of acceleration Post by gizzo on 11/03/15 at 12:54:49 The 540 revolutions factoid is pretty amazing, too. Never thought about that... |
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Title: Re: The defnition of acceleration Post by Serowbot on 11/03/15 at 13:52:23 That's one revolution per gram of pee in my pants... :-?... |
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Title: Re: The defnition of acceleration Post by verslagen1 on 11/03/15 at 13:56:09 5D4B5C41594C415A2E0 wrote:
lightweight :o If you're gonna hit it... hit it! |
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Title: Re: The defnition of acceleration Post by Dave on 11/03/15 at 14:16:31 Both the elapsed time and speed records quoted are from 2003.....wonder how much faster they go after 12 years of technology improvement? |
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Title: Re: The defnition of acceleration Post by sendjulian on 11/03/15 at 17:06:46 pics/video or it didnt happen |
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Title: Re: The defnition of acceleration Post by oldNslow on 11/03/15 at 17:56:30 053E3324353922243F373A25560 wrote:
Looks like they don't. I've no clue why though. http://www.nhra.com/points/national-records.aspx |
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Title: Re: The defnition of acceleration Post by oldNslow on 11/03/15 at 18:07:22 1F21202C3E22234D0 wrote:
Looks like they don't. I've no clue why though. http://www.nhra.com/points/national-records.aspx[/quote] Well. I just got a clue. In 2008 the race distance for top fuel was shortened to 1000 feet, which is 320 feet shy of a 1/4 mile. |
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Title: Re: The defnition of acceleration Post by Kris01 on 11/03/15 at 18:17:17 Why in the world would they do that? People have been racing the 1/4 mile for decades! |
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Title: Re: The defnition of acceleration Post by pg on 11/03/15 at 18:22:23 Quote:
[media]http://www.youtube.com/watch?v=In9XQZFPv0o[/media] 12 second clip of someone going about 200 mph. Best regards, |
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Title: Re: The defnition of acceleration Post by oldNslow on 11/03/15 at 19:14:44 744D564C0F0E3F0 wrote:
" The NHRA shortened its Nitro class races after Top Fuel driver Scott Kalitta was killed in a race at Englishtown, N.J., in June of 2008. Races were chopped from a quarter-mile in length to 1,000 feet -- which is a difference of approximately 320 feet. Cars were going faster and faster, and there wasn’t enough room for drivers to shut them down. The tracks aren’t big enough. In addition, the longer races put more strain on the parts. Cars were breaking apart and crashing before they got to the finish line." All the other classes are still 1/4 mile. Link to article: http://www.mlive.com/autoracing/index.ssf/2011/02/nhra_shortened_nitro_class_rac.html |
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Title: Re: The defnition of acceleration Post by Kris01 on 11/03/15 at 19:20:39 Thanks. I didn't know that. |
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Title: Re: The defnition of acceleration Post by oldNslow on 11/03/15 at 19:35:48 68514A501312230 wrote:
Me neither, until tonight. Between this thread and Google, I've learned more about drag racing than I've ever known in my life. :) |
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Title: Re: The defnition of acceleration Post by Kris01 on 11/03/15 at 19:39:32 The comment on your link is right. Instead of shortening the race distance, they should limit the boost on the blowers or add additional safety factors or something. Oh well. Too late now. 8-) I wonder what our beloved thumper would run? 15 secs. maybe? |
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Title: Re: The defnition of acceleration Post by Dave on 11/04/15 at 02:00:09 pg: I have seen that before at the Dragon Run each summer.....it is Oldfeller: https://www.youtube.com/watch?v=In9XQZFPv0o [media]http://www.youtube.com/watch?v=In9XQZFPv0o[/media] |
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Title: Re: The defnition of acceleration Post by Oldfeller on 11/04/15 at 04:31:18 I seem to remember them shortening the run distance because so many dragsters were going air born (or sideways) in the last little bit and coming down in little pieces. Top speeds were in excess of 350 mph. Horsepower had gotten to the point it was just plain BREAKING the frames whenever the tires would hit a sticky spot on the track and "hook up a bit better" unexpectedly. Too many top drivers were getting killed or severely injured in the last few seasons. And they couldn't stop well enough either. Not with three chutes even. By shorting the run they made it safer and still allowed the "anything goes" mentality of the teams to continue. Tires and running gear became the focus then as there was more horsepower already available than could possibly be used. |
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Title: Re: The defnition of acceleration Post by Serowbot on 11/04/15 at 07:30:11 I rode in my buddy's 11-second, tubbed, Chevy Nova once... The launch felt like we were rear-ended... my guts jumped into the non-existent, back seat... First couple of seconds, all I saw was sky,... once the ground appeared I was fixated on a spot far beyond the end of the pavement, where I believed we would stop... Only thought in my head was... "This can't be right"... :-?... When we stopped he looked over at me, and said, "Yeah,... it still gets me every time, and I do it every weekend".... ;D... |
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Title: Re: The defnition of acceleration Post by BSTON on 11/04/15 at 07:32:01 Example of the fuel pump on a single cylinder of a top fuel drag racer. https://youtu.be/xGTbQuhhluY |
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Title: Re: The defnition of acceleration Post by justin_o_guy2 on 11/04/15 at 08:19:50 I looked at others, firing order change, moved the super charger back.. Crazy how flow times the motor turns and they go so far. |
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Title: Re: The defnition of acceleration Post by Art Webb on 11/04/15 at 08:27:40 6670677A62777A61150 wrote:
he;s right, my 12 second Chevelle was just as brutal, and i never got used to it crazy how the 13 second Ninja didn't really seem near as fast :o |
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Title: Re: The defnition of acceleration Post by Kris01 on 11/04/15 at 15:37:50 7667607B7A340 wrote:
Geez! :o So that's how they get 8000 horsepower! Ya gotta dump 5 gallons a second of fuel into the cylinder! I got 'em beat! My bike gets 60-70 mpg! ;D |
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Title: Re: The defnition of acceleration Post by Kris01 on 11/04/15 at 15:41:34 Correction! That's over 3 cups of fuel a second! :o I did the math. Check the stats on this video. https://www.youtube.com/watch?v=-VF0JwxQqcA |
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