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  1. #1
    Resident Jicky Jack Jeff C's Avatar
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    Possible theory on Porpoising

    Just want to throw something out............


    I hear different people saying that their ski porpoises at high speeds.

    I wonder if that might be due to the scoop type intake grates.

    I just put on a Riva grate. Had a stocker on there before. I notice that is will want to porpoise much easier than before.

    The scoop must be catching more water and throwing it upwards to load the top of the pump better.

    As the front of the ski comes back down on the water the scoop progressively catches more and more water, thus pulling it down more and more as the pressure on the scoop increases.

    It does definately keep the pump loaded better than the stocker, I did notice more porpoising. I can quickly eliminate the porpoising by moving a bit forward, and is not a problem..........

    I wonder how many of you that have porpoising problems, ALSO have the Riva or some other type of sccop style grate?


  2. #2
    Resident Jicky Jack Jeff C's Avatar
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    nobody wants to comment?

  3. #3

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    It's a combination of things.
    The faster you go the harder it is to control.

  4. #4
    Got Boost? psycho rxp's Avatar
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    Buy the RC enginering Block offs.... they almost eliminate it completely!! I can now do full superman position on the low fuel buzzer, and no porpoising. @ 77+

  5. #5
    Site Admin Green Hulk's Avatar
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    i cant wait to get out on the water with my RE blocks. I wish i had an extra set to put on Careys ski.

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    i'd like to know if any of these block offs will work on my RXT... if i go in superman i porpoise bad on glassy water. i need to get in a certain position on the ass end of the seat to get my best speed with no porpoise.

    any way we can take measurements and see if Riva or RE block-offs will work on the 3-seaters?

    i might have to go give Brendan or Rafi a visit in jersey and swipe the block-offs off their machines late at night and see if they work

  7. #7
    Been there and back! BDNJ's Avatar
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    Shibs: I tried to put one of my RE's on Mxl's Dad's (Mike) Rxt, but the current shape/size DOES NOT FIT. It's not even close. Maybe Jerry could make some calls and have them work up a special set to test.

  8. #8

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    how would block off help that. thats first herd that.

  9. #9
    Been there and back! BDNJ's Avatar
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    Quote Originally Posted by seadoolover
    how would block off help that. thats first herd that.

    Seadoolover: The ones talked about in this thread are more than simple blockoffs. They fit flush with the hull and extend the hull anywhere from 2-5". They really help stabilize the ski for better hookup/reduced porpoising. Especially at better than stock speeds!

    Try a set from a friend if possible; you might be sold as well.

    Brendan

  10. #10
    BlackHawk's Avatar
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    Quote Originally Posted by psycho rxp
    Buy the RC enginering Block offs.... they almost eliminate it completely!! I can now do full superman position on the low fuel buzzer, and no porpoising. @ 77+
    Okay okay...what the hell is a full superman positon...I got no clue

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