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Author Topic: Acceleration  (Read 3094 times)
Reeves
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« on: December 14, 2011, 06:53:27 PM »

This is the sort of information that one NEEDS come along a Saturday night, and you're taking your rod and your best girl or guy to the A&W to show off.

You tell everyone how FAST your ride is, and some smart @$$ in a cowboy hat comes over and asks if you want to race his strange looking car................


 

 



Read this thru 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…..



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 (0.15) of a second for all 6,000+ horsepower (some believe 8,000 HP is more realistic - there are no dynomometers capable of measuring) of an NHRA Top Fuel dragster engine to reach the rear wheels.


Under full throttle, a dragster engine consumes 1-1/2 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'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 nitromethane, the flame front temperature measures 7,050 deg 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 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 one 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.

 

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 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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Little Bear Game Farm
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Kick 'Em Up - Knock 'Em Down

« Reply #1 on: December 14, 2011, 07:32:29 PM »

Well Done Reeves, its amazing how far we have come in the last 100 years since the model T, not to mention just the last 30 years.  Makes me wonder about my job security over the next 40 years being a road builder.  Are we even going to need roads in 40 years?  s47
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Chukar and Pheasant Propogation - Trust my advice based on the knowledge that I have not been doing this very long and don't know a lot more than I do know...  But at least I know that I don't know
CharlieHorse
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Northern Bobwhites

« Reply #2 on: December 22, 2011, 10:57:34 PM »

 ww2

This sounds comparable to a Ford Pinto setting in wait for a Toyleta to pass by at top speed (70-80mph), then blowing it's doors off within a couple hundred feet.


 c181
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Reeves
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« Reply #3 on: December 24, 2011, 10:28:25 AM »

I don't have the Pinto done yet & it's already scaring the pee out of me !  s020
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CharlieHorse
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Northern Bobwhites

« Reply #4 on: December 25, 2011, 12:08:35 AM »

I don't have the Pinto done yet & it's already scaring the pee out of me !  s020

I can imagine!   sk3   Age makes a guy a lot smarter too.   s020


Merry Christmas Everyone!


 c181
« Last Edit: December 25, 2011, 12:12:30 AM by CharlieHorse » Logged

I pledge allegiance to the flag of the United States of America, and to the Republic for which it stands: one Nation under God, indivisible, with Liberty and Justice for all.
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