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Thread: A lesson in acceleration

  1. #1
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    9th June 2005 - 21:19
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    A lesson in acceleration

    I was handed this by a mate who is a drag car fan, I give him endless shit about how cars are so slow ect, my only response was "Well, I'm still faster than YOU"

    First some useful? info:
    One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Indy 500.
    Under full throttle,A Top Fuel dragster consumes 1 gallon of nitromethane per second, a fully loaded 747 consumes jet A1 (fuel) at the same rate with 25% less energy produced.
    A stock Dodge 426 Hemi V8 cannot produce enough power to drive the dragster's supercharger.
    With 3000 CFM (cubic feet per min) being ramed in by the supercharger on overdrive, the fuel mixture is comperssed into a near solid form befor ignition, cylinders run on the verge of hydraulic lock at full throttle.
    At the stoichiometric 1.7:1 air/fuel mixture for nitromethane the flame front temperature measures 7050 degrees F. (cook a chicken REAL fast! mv)
    Nitromethane burns yellow, the white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gasses.
    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 1/2 way, the engine is dieseling from compression plus the glow of exaust valves at 1400 deg F, the engine can only be shut down by cutting the fuel off.
    If spark momentarily fails early in the run, unburned fuel builds up in the affected cylinders and then explodes with sufficent force to blow cylinder heads off in pieces or split the block in half.
    In order to exceed 300 mph in 4.5 seconds, dragsters must accelerate at an average of over 4G's.
    In order to reach 200 mph well befor half-track acceleration approaches 8G's.
    Dragsters reach over 300 miles per hour befor you have completed reading this sentence.
    Top Fuel engines turn aproximately 540 revolutions from light to light.
    Including the burnout the engine must only survive 900 revolutions under load.
    The redline is quite high (for a V8, not your whateverRRRRR mv) at 9500 rpm.
    Time for a quarter mile run 4.441 seconds (on 10/05/03 Tony Schumacher)
    Top speed is 333.00 mph (533 kph) (on 09/28/03 Doug Kalitta)

    The bottom line, assuming evrything is paid off, the crew worked for free (crews get PAID now? mv) and nothing blows up, each run costs aprox $1000.00 per second. (Thats U.S. $ too. mv)

    What this means to us:
    You are riding the avarage (your choice here) MotoGP bike. Over a mile up the road , a Top Fuel dragster is staged and ready to launch down a 1/4 mile strip as you pass.
    You have the advantage of a flying start.
    You run your bike hard up through the gears and blast over the starting line at honest 200 mph (923 ft/sec) or (320 kph) (YAAFUCKINGHOOO! mv)
    The "tree" goes green for both you and the dragster at that moment.
    The dragster launches and starts after you.
    You keep your wrist cranked hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds the dragster catches and passes you.
    He beat you to the finish line, a quarter of a mile away from where you just passed him.
    Think about this, from a standing start, the dragster had spotted you at 200 mph and not only caught you, but nearly blasted you off the track when he passed you within a mere 1320 foot long course!

    Sucks eh? We need faster bikes!
    We do have advantages though, we can go around corners and thay aren't using them as pursuit cars yet.
    It took me ages to type this so you had better have appreciated it!
    I'm a bloody mechanic, not a typist!
    We all have our little obsessions...

  2. #2
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    10th April 2005 - 09:35
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    Fuckin impressed at the stats bro. Typing ain't bad either

    Bikes are still cooler.

  3. #3
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    3rd June 2005 - 23:06
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    i'm sure having your head pinned to the headrest/rollcage will bring a healthy grin to your boat race

  4. #4
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    26th February 2005 - 11:00
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    I also remember some figure given for the thrust of the exhaust gasses exiting the pipes being quite incredible,can't remember the figure, but with 3000 cfm going in and then coming out hot you get the idea.
    Although the thrust is directed upwards.

  5. #5
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    1st December 2004 - 12:27
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    Just ask him what happens when he gets to a corner.
    And how easy are they to park.
    Motorbike only search
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  6. #6
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    This looks very much copied from a page linked from a KB thread that I read the other day, hmmmmm....

  7. #7
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    lets see the bugger get the dragsgter round a corner--and then casually lean in and say--ok bud--best outa 3 hu--and fuck off at 200km/h -wait the half hour itll take him to turn round
    To see a life newly created.To watch it grow and prosper. Isn't that the greatest gift a human being can be given?

  8. #8
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    Thumbs down

    Quote Originally Posted by GROOMER
    This looks very much copied from a page linked from a KB thread that I read the other day, hmmmmm....
    Perhaps Pure acceleration 27th February 2005, 17:18

    cheeky li'l fucka

  9. #9
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    2nd February 2005 - 13:41
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    Sorry, if the bike starts at 200mph, or 923 ft/sec, won't he finish before the dragster catches him? (given the course is 1320 ft long)

    Thank God that the wildly inefficient 747 is somewhat more reliable for that extra 25% of juice it uses.
    ...

  10. #10
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    Yup, somethings not quite right there. The rest of it is interesting reading though.

  11. #11
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    12th September 2003 - 12:00
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    Isn't a mile approx 5280 feet?

    Therefore 200mph is 105600 fph.

    Divide by 3600 = 293.3333333 feet per second.

    That's how the dragster goes past you.

    It takes 4.5 seconds to do the quarter mile at 200mph.

    QED
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

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  12. #12
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    Quote Originally Posted by GROOMER
    This looks very much copied from a page linked from a KB thread that I read the other day, hmmmmm....
    I first read it last year (?) on the Aussie VFR forum. There's a guy on there who posted it - he works for a drag racing team; each guy has a specific job, and he is in charge of supercharger belts (and other things if required).
    One interesting thing missed out - on nitromethane, the tuning is back to front; if the engine's running too lean, they pump less fuel in, and if it's too rich, more fuel.
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  13. #13
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    13th January 2005 - 11:00
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    nice readin..
    no mention on the deafening sound they make too..

    I also watched a doco on drag cars, they rebuild from the sump up virtually every drag. An engine that lasts ~15 seconds.. The amount of pressure those things build up is unreal

  14. #14
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    13th February 2004 - 06:46
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    Quote Originally Posted by riffer
    Isn't a mile approx 5280 feet?

    Therefore 200mph is 105600 fph.

    Divide by 3600 = 293.3333333 feet per second.

    That's how the dragster goes past you.

    It takes 4.5 seconds to do the quarter mile at 200mph.

    QED
    Good calculating grasshopper. Top fuel dragsters are now topping 325mph on a good pass.

    0 to 500kph in 4 seconds. Gimme the keys!
    Vote David Bain for MNZ president

  15. #15
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    31st March 2003 - 13:09
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    yeah... but with the price of fuel and all - I think I'll stay on the RF.

    Thanks anyway
    $2,000 cash if you find a buyer for my house, kumeuhouseforsale@straightshooters.co.nz for details

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