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  1. #1
    Connecticut CrazyA's Avatar
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    GPR Trim Tab Question

    I know there's been tons of questions on this, but I'm still a little confused.

    Does shimming the trim tabs add speed by itself?

    What I mean is, if you're chasing down a handling problem and/or bucking or whatever, then I can see where correcting/trying different combos can help greatly.

    But, if you take a ski that is riding and handling perfect, then shim the tabs, does the act of shimming of the tabs add speed alone, all other things being equal??

    Thanks.


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  2. #2
    Moderator Insanediego Joe's Avatar
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    no it does not.

  3. #3
    Connecticut CrazyA's Avatar
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    Thank you Joe... now I know.



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  4. #4
    Hydrotherapy's Avatar
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    what if it still keeps him in and within the sweet spot/balance point he has, but generates a little more lift giving slightly more speed.

  5. #5
    Moderator Insanediego Joe's Avatar
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    IMO, shimming the tabs down allows for a steeper angle on the plate preventing porpoiseing. Shimming the back of the tabs down will help keep the nose down in the rough stuff. Running with no tabs will be the fastest but good luck on the handling.

  6. #6
    Hydrotherapy's Avatar
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    only asked as i wont learn unless i chew the fat with the big boyz

  7. #7
    Moderator Insanediego Joe's Avatar
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    Quote Originally Posted by Hydrotherapy View Post
    only asked as i wont learn unless i chew the fat with the big boyz
    shit, hehe. You better go ask WFO, fercho,yudluz or hydrotoys cause half the shit I post I am just guessing anyway!

  8. #8
    Moderator OsideBill's Avatar
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    Quote Originally Posted by Insanediego Joe View Post
    shit, hehe. You better go ask WFO, fercho,yudluz or hydrotoys cause half the shit I post I am just guessing anyway!
    The other half he posts he knows completely nothing about

  9. #9
    Happily Self-Employed WFO's Avatar
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    Its all about a balancing act, and keeping the intake grate in the water. Depending on the hull, the shoe height in the boat, the ride plate angle, which grate you use, how much fuel you run, what type of water you ride in, bla, bla, bla.

    Usually a boat in the low 70s wont need the tabs shimmed. The faster a boat goes, the more lift or the higher it rides in the water. Thats usually when you need to shim the tabs. A boat that is bouncing when you hit a ripple wont gain anymore speed, so you drop the nose by shimming the tabs and plate. If you ride superman you usually have to drop the tabs more to compensate for the extra bow lift.

  10. #10
    Hydrotoys's Avatar
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    ...and mech tabs allow a GPR to seem like a much, much longer craft in rough water, while not losing any speed in smoother conditions.

    If you can find some...

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