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  1. #1
    Hydrotoys's Avatar
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    Time to rock your world Ultra folks... stand by.

    2.8mm-3mm


    I'll have a visual in about 3 minutes....


  2. #2
    Site Admin Green Hulk's Avatar
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  3. #3
    Hydrotoys's Avatar
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    Okay, so here is what you need to know to add 5mph to your ski, and MORE THAN LIKELY screw up the handling so bad it can't be fixed....

    Are you game...?

    I would like to be the first to welcome all you new Ultra owners to the world of RXP and RXT, and the collusion of the manufacturers to keep you under 65mph...or damn near to it.

    The following picture is optically trash. Sorry, but the black hull is a bastage while trying to hold a straight edge. I'll save your eyes some trouble and explain.

    You see.... Kawi has built in a 2.5-3.0 -+1mm lip in the rear of our hulls... that right, a speed limiter....

    Now before you break out the sanding blocks, you might want to go find out how badly the RXP and RXT handles after you kill the lip.

    That straight edge is sitting on the rear lip, and is about 18inches long. In the middle of that straight edge is a big ol' gully of about 3mm. THAT is why 250hp won't move this ski, and why it handles sooooo damn good.

    Back to your regularly scheduled program.
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  4. #4
    Banned User
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    For the what its worth deparment I think it will be a good thing and have a hunch its why the stxr wanted to kinda swap endes with ya at certin times.
    the old stx could pick up 1 to 2 right here most times with better accerlation as well.

  5. #5
    Hydrotoys's Avatar
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    Good point! I did not know the STXR had the hump as well. Looks like it starts about 8" from the rear of the ski, and heads south...quickly.

  6. #6
    Fast1's Avatar
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    can any other owners confirm that their hull is a replica of Hydros?

  7. #7
    jscottmsc's Avatar
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    Quote Originally Posted by hydrotoys View Post
    Now before you break out the sanding blocks, you might want to go find out how badly the RXP and RXT handles after you kill the lip.
    Does sanding the lip = hull truing?
    How bad does an RXT or STXR handle after the rear lip is sanded off?

    Does it matter is it was done at home in the garage vs by a professional?

  8. #8
    BERMY_BOY's Avatar
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    Hull Modification Have Fun!!!!

    why would you want to sand that out the hull is made like that for a reason. If You alter that wrong the whole attitude of you boat is gona be SCREWED!!! Wish you all the best!!!!!!!

  9. #9
    Hydrotoys's Avatar
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    Quote Originally Posted by BERMY_BOY View Post
    why would you want to sand that out the hull is made like that for a reason. If You alter that wrong the whole attitude of you boat is gona be SCREWED!!! Wish you all the best!!!!!!!
    EXACTLY!

    This wasn't an accident, and we have no way to determine what it effect, but I can tell you that there is major speed taken away...AND it explains why the holeshot is super-predictable EVERY time.... This ski has permanent trim-tabs in the down position. This makes the turning so precise, and explains why in every shot, the comment is made about "plowing."

    I would let some brave, or stupid souls sand theirs out and report back. This is NOT something you just want to play with. Furthermore, if you were just BOUND and determined to remove it, I'd take it to a body shop that does glass repairs so that they could map it out, before touching it. That way when you find out it's a total failure, you can pay them $1000's plus to repair it. Otherwise, they will have NO idea what you are talking about.

  10. #10
    BERMY_BOY's Avatar
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    Ok I see where you was saying now thanks for clearing it up. If that is the case with that piece of hull acting like a trim tab in the down position it makes sense in how the boat acts.

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