• Welcome to RCCrawler Forums.

    It looks like you're enjoying RCCrawler's Forums but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members, and much more. Register now!

    Already a member? Login at the top of this page to stop seeing this message.

DEFINITION OF ACCELERATION (Email I got)

Rockcrawler

I wanna be Dave
Joined
Jan 15, 2005
Messages
6,777
Location
Hueytown, Alabama
DEFINITION OF ACCELERATION..and we thought WE were quick..........



One top fuel dragster 500 cubic inch Hemi engine
makes more horsepower than the first 4 rows of stock cars at
theDaytona 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
inchemical 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
4.428 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!
ad the part about the "Vette.....enjoy!!
 
Old, you internet newbie loser.

This is most interesting to me:

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.
 
I heard all Top Fuel drivers crap their pants on launch.
 
Pretty shure the top fuel dragsters are running close to 8,000hp by now. pretty crazy.
 
and then...




Someone's math is off. :lol:
540 rev / 4.5 sec = 120 revolutions per second

120 rev/sec * 60 sec/min = 7200 revolutions per minute

So they spin an average of 7200 rpm down the track. That seems reasonable, I doubt they would always run them at redline. Back then I think many dragsters were still using 2 speeds where now they only run 1 gear and slip the clutch until half track.
 
Last edited:
You guys and your math. Pffffffffffff.

Wild guesses and assumptions are much easier.
 
Saw that, then thought, RPMs, revolutions per minute. The car only needs like 4.5 seconds to get done with the run. Add in burnout and staging and that's it?

I see Griz's math (did some myself) but 540 revolutions for the burnout AND the run just seems low.

..and to think that mid-way through the run down the track the plugs are toast. WOW.
 
I see Griz's math (did some myself) but 540 revolutions for the burnout AND the run just seems low.

..and to think that mid-way through the run down the track the plugs are toast. WOW.
540 revolutions does not include the burnout. That is just from green light to finish light.

It says 900 revolutions with the burnout.
 
I remember my Aunt's old big ass station wagon dieseling.

Big deal. :ror:
 
Back
Top