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Short dragster wheelbase?

Discussion in 'The Hokey Ass Message Board' started by sgtlethargic, Apr 15, 2010.

  1. sgtlethargic
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    sgtlethargic Member

    Are there reasons not to have too short of a wheelbase on a HAMB dragster?
  2. sgtlethargic
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    sgtlethargic Member

  3. sgtlethargic
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    sgtlethargic Member

  4. lippy
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    lippy Member

    You mean like 50 in or something?:D
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  5. sgtlethargic
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    sgtlethargic Member

    Not that short ... right now I've got 78" mockery.
  6. lippy
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    lippy Member

    How much power are we talking about? Lippy
  7. sgtlethargic
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    sgtlethargic Member

    Souped up Falcon 170 straight-six ... ha ha ... maybe 200 horses?
  8. Yellowrr
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    Yellowrr Member

    I believe that as cars got more motor, they got longer wheelbases to make them more stable and "want" to go straighter off the line. I'll never know how they ran those AA/Fuel Altereds back in the day!!!
  9. Tman
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    Tman Member

    what are you building? A Suzuki Samurai?!?!
  10. lippy
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    lippy Member

    Well, I suppose if it was real straight and had a plug or two fouled it MIGHT go straight. :rolleyes::D I'm trying to visualize two yardsticks long....nope. I don't think launching is a problem, it's wide open in the lights bothers me. :p If it hits a snake turd it'll be a handfull. Lippy
  11. sgtlethargic
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    sgtlethargic Member

    That's what I'm talkin'bout- top end ... maybe a buck, a buck-twenty with a good tailwind.
  12. Tman
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    Tman Member

    Make it at least 100" to open your future possibilities.
  13. sgtlethargic
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    sgtlethargic Member

    And 78" is closer to two meters :D.
  14. lippy
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    lippy Member

    Or as my buddy tells me, you'll have plenty of time to figure out what went wrong in intensive care. I agree, all kidding aside, I wouldn't make it shorter than a hundred either. That's pretty fast for a souped up six. If it was 90 in I'd drive it, but I wouldn't tell anyone else to. :D Lippy
  15. lippy
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    lippy Member

    Isn't there a W.B. rule for HAMB cars? Lippy
  16. sgtlethargic
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    sgtlethargic Member

    No.
  17. sgtlethargic
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    sgtlethargic Member

    There are some short wheelbase race cars that go a lot faster.
  18. sgtlethargic
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    sgtlethargic Member

    ^^^

    Attached Files:

  19. sgtlethargic
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    sgtlethargic Member

    Back to the top end
  20. moparsled
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    moparsled Member

    Not that a HA/GR is NHRA legal but I believe the NHRA minimum WB is 90"

    my rear engine HA/GR is 120" WB, and the driver is pretty cramped.

    If I had the power to pull a direct drive I could probably subtract 10", then if I sat the driver position upright a bunch, I might get close to 100"
  21. Bearing Burner
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    Bearing Burner Member

    The shorter the WB the harder to drive. As stated eariler as HP increased so did WB. Had a Flathead Chasies Research dragster in mid sixties with 120 " WD drove well on rough strips.
  22. sgtlethargic
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    sgtlethargic Member

    The driver has plenty of room the way I have mine mocked up.
  23. sgtlethargic
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    sgtlethargic Member

    What, from a physics perspective, is the concern with a short WB? What would make it want to swap ends?

    It's not going to break loose on the top end from HP. The CG will be low. The worse things I can think of is if a tire blew, the rear locked somehow, or the brakes (rear only) are mashed and/or biased.
  24. Dolmetsch
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    Dolmetsch Member

    92 is about the safe minimum. My senior Dragster is 96 runs straight no problems. !00 is very good. 120 to 125 is enuf for anything. After that it is my rail is longer then yours , sort of like the boat guys. However the longer a rail is the less suspension it needs. That appeals to some and is understandable.
  25. I Drag
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    I Drag Member

    From a physics perspective, the longer the wheelbase is, the more time it takes for it to get out of shape. Visualize a car with a 100 yard wheelbase, it would take a long time for it to get sideways. It really is that simple.
  26. Babyearl
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    Babyearl
    ALLIANCE MEMBER

    Well said.
  27. sgtlethargic
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    sgtlethargic Member

    I agree it's easy to see how a long wheelbase helps. What determines the short limit? If the wheelbase is longer than the track width ...?
  28. sgtlethargic
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    sgtlethargic Member

  29. SamIyam
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    SamIyam Member

    In the new NHRA rule book:

    SECTION 4A – SUPER PRO, PRO, SPORTSMAN
    Page 4.5
    FRAME: 4
    WHEELBASE (1/6/10)
    Minimum 85. Maximum wheelbase variation
    from left to right: 1 inch. Dragsters: 2 inches. Minimum front tread width: 26 inches on
    any dragster.

    I'd make it 90" and call it done.

    90" is short... and when I came up with the rules for the HA/GR cars, the idea was formed around this car that I had seen at the Nostalgia Drags in Fremont back in the 80's... that had a T frame... I was 13-14 years old, and got it in my head that my brother and I were gonna build one.

    Here it is, and I am guessing it is around a 90" wheel base...
    [​IMG]

    Sam
  30. oldskooloutlaw
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    oldskooloutlaw Member

    If you want to find out how a short wheelbase car handles find a 90" VW dune buggy, that should tell you how long yours needs to be. Ask any woman longer is always better.

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