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The definition of acceleration!

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  • The definition of acceleration!

    Read this slowly and try to comprehend the amount of force produced in just under 4 seconds!
    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

    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 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 in chemical 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.
    N29787
    '41 BC12-65

  • #2
    Re: The definition of acceleration!

    Pretty impressive. Amazing the lengths humans will go to in order to get relief from the boredom of a Saturday afternoon.

    "Dual magnetos supply 44 amps to each spark plug." I'm going to be a smartass here and point out that 44 Amps., by itself is a pretty meaningless value, particularly if related to the output of an arc welder. If you have 44 amps at one volt you have a medium light bulb amount.

    If you have a 44 Amp. pulse at 30,000 volts, (typical race engine ignition voltage, I would guess) then you have 1.3 Megawatts. A stick welder would be about 1740 watts at that amperage.

    I hereby give permission to use the terms "ignition puts out short pulses of over 1 megawatt." Now isn't that more impressive. Chuckle.

    .
    Last edited by flyguy; 11-11-2011, 00:04.

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    • #3
      Re: The definition of acceleration!

      I have been shocked by ignition systems more times than I care to admit. A NORMAL ignition system will curl your toe nails and turn them black. A MEGAWATT of power would blow your whole lower body into orbit after it turned it into a charcoal briquet!
      Hank

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      • #4
        Re: The definition of acceleration!

        I remember in my youth that great fun could be had zapping unsuspecting people with an old crank telephone generator. Not megawatts, but nonetheless effective.
        EAA 93346 TF #863
        1946 BC-12D N96421
        currently a collection of parts

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        • #5
          Re: The definition of acceleration!

          Megawatts is for you home, the spark is measured in Joules...the electrode from the plug is gone in 2-3 seconds of running at full power....Just like your welder....Tim
          N29787
          '41 BC12-65

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          • #6
            Re: The definition of acceleration!

            Originally posted by astjp2 View Post
            ....
            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....
            What about the UK Bloodhuond (I had to spell it this way, otherwise Miss KelliBelle shows her picture):

            "By the time the missile has just cleared the launcher it is doing 400 mph. By the time the missile is 25 feet from the launcher it has reached the speed of sound (around 720 mph). Three seconds after launch, as the four boost rockets fall away, it has reached Mach 2.5 which is roughly 1800 mph"

            Considering the missile was 25 feet long, it equates to standing start to supersonic in less than 50 feet. Not to mention 0-1800mph in three seconds.... Not bad for the mid-fifties.


            Or the US Sprint; 0 to Mach 10 in under 5 seconds. Go to 1:37. 10 years in development, formally active for 1 day before decommissioning started. It and other projects were victims of SALT, where the US and USSR could effectively defend only one object each.


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            • #7
              Re: The definition of acceleration!

              Commie proproganda!
              N29787
              '41 BC12-65

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              • #8
                Re: The definition of acceleration!

                Joules? Oh, sounds like that fancy sophisticated scientific stuff. I don't know anything about that.

                Where could I get one of those Joule meters? It sounds like a pretty handy thing to have around.

                DC
                Last edited by flyguy; 11-11-2011, 15:04.

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                • #9
                  Re: The definition of acceleration!

                  I was helping my cousin work on his 69' camaro. We had just removed the old dual point distributor and coil and replaced it with a modern MSD ignition system(electronic distributor & coil). He started it up and I was trying to fine tune the timing which is supposed to be done at 2500rpms, when one of the plug wires just above my hand came loose from the distributor cap(same one I had the timing light hooked to). The wire fell onto the top of my hand and the next thing I knew my cousin was shaking and screeming at me as I was laying flat on my back 20 feet from the car. From his point of view, he said I stood straight up,quivered,then kicked myself loose from the car. All I remember is seeing the plug wire hit my hand then laying in the middle of the hanger floor. My right arm was numb for an hour or so,my nerves were twitchy for hours, and my right arm twitched and hurt for days. The doctor told me that I would suffer no long term affects and that I was lucky because it could've very easily stopped my heart.
                  Last edited by crispy critter; 11-11-2011, 05:49.
                  Kevin Mays
                  West Liberty,Ky

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                  • #10
                    Re: The definition of acceleration!

                    Now thats what I call acceration!



                    Originally posted by crispy critter View Post
                    I was helping my cousin work on his 69' camaro. We had just removed the old dual point distributor and coil and replaced it with a modern MSD ignition system(electronic distributor & coil). He started it up and I was trying to fine tune the timing which is supposed to be done at 2500rpms, when one of the plug wires just above my hand came loose from the distributor cap(same one I had the timing light hooked to). The wire fell onto the top of my hand and the next thing I knew my cousin was shaking and screeming at me as I was laying flat on my back 20 feet from the car. From his point of view, he said I stood straight up,quivered,then kicked myself loose from the car. All I remember is seeing the plug wire hit my hand then laying in the middle of the hanger floor. My right arm was numb for an hour or so,my nerves were twitchy for hours, and my right arm twitched and hurt for days. The doctor told me that I would suffer no long term affects and that I was lucky because it could've very easily stopped my heart.
                    "I'm from the FAA and we're not happy, until your not happy."

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                    • #11
                      Re: The definition of acceleration!

                      Glad your still with us.
                      L Fries
                      N96718
                      TF#110

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                      • #12
                        Re: The definition of acceleration!

                        A Joule is called a watt / second therefore 1 joule = 1 watt for 1 second
                        this means that our old magnetos have abou 20,000 volts @ 1A for ~2ms which gives us 24mJ
                        MSD 6 has primary 450V @.8 amps per 1000 rpm, givea a secondary of 40,000 volts up to 20* of crankshaft rotation. 100mJ
                        MSD44 magneto primary 500V@ 44A, gives a secondary of 50,000 volts for 26* of crankshaft rotation = 1 joule

                        Who'd Thunk, I am not even an enginerd!!!!!
                        N29787
                        '41 BC12-65

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                        • #13
                          Re: The definition of acceleration!

                          For some reason mother nature doesn't like me, I have as a tower crane operator been hit by lightning 9 times and once on my lawnmower. In each case you wouldn't believe how fast people can run away from me-my daughter still gets the giggles when she recalls how fast my wife took off and left me when the lawnmower took a hit and you wouldn't believe how fast 20 rodbusters can leave the top deck on a building when I get hit--talk about acceleration!

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                          • #14
                            Re: The definition of acceleration!

                            Does not sound like you are getting paid enough for operating a crane, no matter how much you are getting paid. Marv
                            Marvin Post TF 519

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