acceleration explained.
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  1. #1
    VIP Sponsor David Cavanagh's Avatar
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    Default acceleration explained.

    Acceleration explained............Read this......it is incredible............





    * One Top Fuel dragster outfitted with a 500 cubic-inch replica Dodge (actually Keith Black, etc) Hemi engine makes more horsepower (8,000 HP) than the first 4 rows of cars at NASCAR's Daytona 500.

    * Under full throttle, a dragster engine will consume 11.2 gallons of nitro methane per second; a fully loaded Boeing 747 consumes jet fuel at the same rate but with 25% less energy being produced.

    * A stock Dodge Hemi V8 engine cannot produce enough power to merely drive the dragster's 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 lockup at full throttle.

    * At the stoichio metric 1.7:1 air/fuel mixture for nitro methane the flame front temperature measures 7050 degrees 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. Which is typically the output of an electric arc welder in each cylinder.

    * Spark plug electrodes are totally consumed during a pass. After 1/2 way thru the run, the engine is 'dieseling' from compression and the glow of the 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 enough sufficient force to blow the cylinder heads off the block in pieces or split the block in half !!

    * Dragsters reach over 300 MPH +... before you have completed reading this sentence.

    * In order to exceed 300 MPH in 4.5 seconds, a dragster must accelerate an average of over 4 G's. In order to reach 200 MPH well before reaching half-track, at launch the acceleration approaches 8 G's.

    * Top Fuel engines turn approximately 540 revolutions from light to light!

    * Including the burnout, the engine must only survive 900 revolutions under load.

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    * The redline is actually quite high at 9500 RPM.

    * THE BOTTOM LINE: Assuming all the equipment is paid for, the pit crew is working for free, & NOTHING BLOWS UP, each run will cost an estimated $1,000 per second.

    0 to 100 MPH in .8 seconds (the first 60 feet of t he run)
    0 to 200 MPH in 2.2 seconds (the first 350 feet of the run)
    6 g-forces at the starting line (nothing accelerates faster on land)
    6 negative g-forces upon deployment of twin 'chutes at 300 MPH





    An NHRA Top Fuel Dragster accelerates quicker than any other land vehicle on earth . . quicker than a jet fighter plane . . . quicker than the space shuttle....or snapping your fingers !!

    The current Top Fuel dragster elapsed time record is 4.420 seconds for the quarter-mile (2004, Doug Kalitta). The top speed record is 337.58 MPH as measured over the last 66' of the run (2005, Tony Schumacher).

    Let's now put this all into perspective:

    Imagine this...........You are driving a new $140,000 Lingenfelter twin-turbo powered Corvette Z-06. Over a mile up the road, a Top Fuel dragster is staged & ready to 'launch' down a quarter-mile s trip as you pass. You have the advantage of a flying start. You run the 'Vette hard, on up through the gears and blast across the starting line & pass the dragster at an honest 200 MPH.... The 'tree' goes green for both of you at that exact moment.

    The dragster departs & starts after you. You keep your foot buried hard to the floor, and suddenly you hear an incredibly brutally screaming whine that seares and pummels your eardrums & within a mere 3 seconds the dragster effortlessly 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.....and it not only caught, but nearly blasted you off the planet when he passed you within a mere 1320 foot long race !!!!

    That, my friends.....is acceleration.
    David Cavanagh

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  2. #2
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    That's great, but ask them to do a second run without rebuilding the engine
    If you've got too much traction, you haven't got enough horse power ...




    .2010 Holden Commodore Ute
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  3. #3
    1000+ Posts Renomad's Avatar
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    Top Fuels are awesome!
    Cheers Renomad

    "Today's mighty oak, is just yesterdays nut that held it's ground"

    Current frogs, Dad's R19 & Dad's Scenic.

    Past frogs, R12 Wagon X2, R12GL, Fuego X2, R10 X2, R8 X.5!


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    Fellow Frogger! DaveB's Avatar
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    Thanks David

    This is a real favorite, one of the alltime great explanations putting acceleration into perspective.
    I've attached a very similar document, small size ~25Kb, pdf format for downloading, to print and impress family & friends
    or at least, tack to the tea-room noticeboard.

    Clink the link below to download.
    Acceleration.pdf

  5. #5
    Fellow Frogger! Fingers's Avatar
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    Someone once asked how loud a top fuel car is, and after some thought I said that you feel them rather than hear them. The sound just pounds at your chest, amazing.

  6. #6
    1000+ Posts 504-504-504's Avatar
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    Some good information on top fuelers here also.
    http://en.wikipedia.org/wiki/Top_Fuel

    Paul

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    Fellow Frogger! tasgill's Avatar
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    Based on the figures in the wiki, a top fuelers fuel consumption is approx. 35000 litres per 100 k's.

    Terry

  8. #8
    1000+ Posts 504-504-504's Avatar
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    Interesting how they have no gearbox and the clutch controls the ammount of power going to the wheels.
    Apparently the clutch is not fully engaged until well into the run.
    Has been stated that by the time the back wheels cross the start line the dragster is moving at 100kph (or was that mph?), and remember at that stage less than maximum power is being used.

    Whole new world.

    Paul.

  9. #9
    1000+ Posts Renomad's Avatar
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    Quote Originally Posted by Fingers View Post
    Someone once asked how loud a top fuel car is, and after some thought I said that you feel them rather than hear them. The sound just pounds at your chest, amazing.
    Yep, you can feel every piston firing! And your eye sight goes blurry because the liquid in your eyeballs vibrate so much!
    I used to think drag racing would be boring, two cars run for a few seconds in a straight line and you have a winner. That was before I actually went to a drag meet.

    A Paul has said a 'Whole new world'!
    Cheers Renomad

    "Today's mighty oak, is just yesterdays nut that held it's ground"

    Current frogs, Dad's R19 & Dad's Scenic.

    Past frogs, R12 Wagon X2, R12GL, Fuego X2, R10 X2, R8 X.5!


  10. #10
    1000+ Posts Renomad's Avatar
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    I also read somewhere once, that if an F1 car at full speed was to pass a Top Fuel just as it was getting off the line, that by the end of the ľ mile, the Top Fuel would be well in front!
    Cheers Renomad

    "Today's mighty oak, is just yesterdays nut that held it's ground"

    Current frogs, Dad's R19 & Dad's Scenic.

    Past frogs, R12 Wagon X2, R12GL, Fuego X2, R10 X2, R8 X.5!


  11. #11
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    Another impressive top fuel sight is the boats 6 seconds over the quarter on water have a look on youtube.
    Cheers Peter

  12. #12
    1000+ Posts FIVEDOOR's Avatar
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    Just watch the rear wheels grow as one takes off, the tyre growth itself provides auto gearing

  13. #13
    Member Pepster's Avatar
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    This is nuts, I have nothing more to say
    1968 R8G 1300
    1965 R8G 1100
    1972 R12G
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