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Old 12-09-2003, 22:49   #1 (permalink)
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eek Acceleration in Perspective

Dunno if this has been posted before, but anyhoo . . .

Acceleration: Put Into Perspective

* One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.

* Under full throttle, a dragster engine consumes 11.2 gallons of nitromethane 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 supercharger.

* With 3000 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 1.7:1 air/fuel mixture for nitromethane the flame front temperature measures 7050 degrees F.

* Nitromethane 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 way, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees 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 9500rpm.


* The Bottom Line; Assuming all the equipment is paid off, the crew worked for free, & for once, NOTHING
BLOWS UP, each run costs an estimated US$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 perspective: 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 & 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 & blast across the starting line & past the dragster at an honest 200 mph. The 'tree' goes green for both of you at that moment.

The dragster launches & starts after you. You keep your foot down hard, but you hear an incredibly brutal whine that sears your eardrums & within 3 seconds the dragster catches & 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 & not only caught, but nearly blasted you off the road when he passed you within a mere 1320 foot long race course.

That, folks; is acceleration!
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Old 12-10-2003, 00:07   #2 (permalink)
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Thumbs up Re: Acceleration in Perspective

intresting read
thanks mate
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Old 12-10-2003, 01:36   #3 (permalink)
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Re: Acceleration in Perspective

Very interesting! My only qualm would be with the 747 energy figure, with each engine producing 54,750lbs of thrust EACH (JT9D-7R4G2), I doubt the drag engine makes this much power. Even jet drag cars only use smaller lighter jet engines rated at a fifth of the massive donks in the 747. Also, nitromethane is a much more potent fuel than AvTur (which is a diesel fuel).

But still, the comparison with the Corvette is fantastic! The amperage figure is very interesting!

Cheers...... Tim
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Old 12-10-2003, 01:42   #4 (permalink)
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Re: Acceleration in Perspective

also the revolutions per run thing is a bit off....

9500rpm = 158.3 revs per second
4.441 second run = 703 revolutions

Still amazing to think that after that it is rebuilt.

Most cars do more than that before you get out your driveway, well probabaly all cars do.
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Old 12-10-2003, 01:47   #5 (permalink)
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Re: Acceleration in Perspective

To work and play with a Top Fuel dragster is awsome,my best mate worked on and was part of the crew for Mr R Kirby before he retired(the Penzoil machine)and the stories he told me on different ocasion's is mind bogling,they certaintly make you wonder.
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Old 12-10-2003, 03:00   #6 (permalink)
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Re: Acceleration in Perspective

bloody good read mate!
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Old 12-10-2003, 03:08   #7 (permalink)
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Re: Acceleration in Perspective

Quote:
Originally Posted by MADXF
also the revolutions per run thing is a bit off....

9500rpm = 158.3 revs per second
4.441 second run = 703 revolutions

Still amazing to think that after that it is rebuilt.

Most cars do more than that before you get out your driveway, well probabaly all cars do.
does that mean they start off at 9500 rpm or do they build up to that from say 5000rpm to 9500rpm before a gear change?
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Old 12-10-2003, 03:12   #8 (permalink)
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Re: Acceleration in Perspective

Well with the use of the 5 stage (or whatever they are using now) clutch, I think they just ran flat stick from start to finish.
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Old 12-10-2003, 03:13   #9 (permalink)
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Re: Acceleration in Perspective

Very interesting read.
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Old 12-10-2003, 03:56   #10 (permalink)
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Re: Acceleration in Perspective

Great read Lamah. Thanks!!!
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