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Offline Tc

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Definition of acceleration
« on: December 03, 2014, 10:40:30 pm »

Sent to me by a friend who customised my Rocket
                             DEFINITION OF ACCELERATION
Read this through slowly and try to comprehend the amount of force produced in just under 4 seconds!  The last paragraph puts it all into perspective !

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..and that includes any aircraft launched by a catapult from an aircraft carrier. Nothing can compare
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 15/100 ths (0.15) of a second for all 6,000 plus horsepower (some believe 8,000 HP is more realistic - there are no dynamometers capable of measuring it) of an N.H.R.A. 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 c.f.m. 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 degrees F.  (Oxy-acetylene on "cut" is 6,300)

Nitro methane burns yellow.  The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapour 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 one pass.  After halfway, the engine is dieseling from compression, plus the glow of exhaust valves at 1,400 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 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 4.428 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 instant.

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 were just passed by 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 !

Online trophied

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Re: Definition of acceleration
« Reply #1 on: December 03, 2014, 11:32:40 pm »
Years ago in Dickinson, Texas if you bought a pit pass you could stand far behind them on the starting line as they made their pass.  Quite and experience, even though at the time they were not nearly as awesome as they are now.  Thanks for sharing and putting things in perspective, all this time we thought carrier fighter plane takeoffs were amazing.
One of the Founding Members of the Twisted Trophies

Offline seadog

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Re: Definition of acceleration
« Reply #2 on: December 04, 2014, 07:20:31 am »
Very informative and interesting.

But my trophy can carry my sandwiches. He can't.  :745: :745:



Offline Coconut

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Re: Definition of acceleration
« Reply #3 on: December 04, 2014, 07:30:40 am »
The Trophy is also a LOT more fun in the Twisties  :156: