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Old 02-25-2011
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MRowsh MRowsh is offline
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Default Friday fun reading => Definition of Acceleration

I thought this an interesting read that was worth sharing.



Read this slowly and try to comprehend the amount of force produced in just under 4 seconds! There are no rockets or airplanes built by any government in the world that can accelerate from a standing start as fast as a Top Fuel Dragster or Funny Car!



DEFINITION OF ACCELERATION

One top fuel dragster 500 cubic-inch Hemi engine makes more horsepower than the first 4 rows of stock cars at the Daytona 500.

It takes just 15/100ths of a second for all 6,000+ horsepower of an NHRA Top Fuel dragster engine to reach the rear wheels.

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 for, 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 4.428 seconds for the quarter mile (11/12/06, Tony Schumacher, at Pomona , CA ). The top speed record is 336.15 mph as measured over the last 66' of the run


(05/25/05 Tony Schumacher, at Hebron , OH ).

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 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 dragster 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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Old 02-25-2011
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Thats incredible......
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Old 02-25-2011
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Quote:
Originally Posted by MRowsh View Post
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 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 dragster 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.
Top Gear should do this.
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Old 02-25-2011
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Do you mean Top Gear -as in Jeremy Clarkson ?????? Hammond tried to drive a fast car ----I don't think HE would give it a try !!!!!!
How the hell do you shift 1 1/2 gals a second? ! ? ! ? (the local fire dept. ???????)
Those figures are staggering !!!!!
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Old 02-25-2011
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I remember when Hammond did that, I don't think he'd want to get into another one....I would put the Stig in the Corvette and a Top Fuel professional driver in the dragster and let them give it a go.
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Old 02-25-2011
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Cool right up M.
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Old 02-25-2011
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I've seen that before, but it's still awesome to read.

You truely can't appreciate those machines until you've actually seen them run.
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Old 02-27-2011
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Quote:
Originally Posted by RAF View Post
I've seen that before, but it's still awesome to read.

You truely can't appreciate those machines until you've actually seen them run.

Yup,

Made a couple of trips to the Spring Nat's in Columbus a few years ago.. Took the boys the second time.... Had a blast... Your TV doesn't do the noise justice.. I don't even think a surround sound system would either.. Ya gotta be there!
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Old 03-01-2011
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Yup,

Made a couple of trips to the Spring Nat's in Columbus a few years ago.. Took the boys the second time.... Had a blast... Your TV doesn't do the noise justice.. I don't even think a surround sound system would either.. Ya gotta be there!
In four seconds you get the impression that you know what it feels like to have your guts nuked in the microwave...
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