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  1. #1
    KC Blue Thunder's Avatar
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    The porpoising thread

    I'm trying to get a feel on how many guys are experiencing porposing with the new Riva open loop plate. I had the 1.5 wedge on and removed it as i was told that it wouldnt be needed anymore and it would only make the porposing worse. My couch never did this before. I realize that there are some aftermarket Blockoff out there like Rivas Pro, the R&D Blockoffs and the ones that JD1 sports which may hit the market soon. I'm sure there will be a general consensus as to which is the best. Is the porposing inherent to Rivas design on the plate or are there other factors coming to play here. Thanks for your input guys.
    Last edited by Blue Thunder; 10-09-2009 at 12:42 PM. Reason: spelling


  2. #2
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    Title fixed

    Try block off's first, then shim the rear of the plate after that...

  3. #3
    KC Blue Thunder's Avatar
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    Quote Originally Posted by Danny View Post
    Title fixed

    Try block off's first, then shim the rear of the plate after that...
    Thanks for fixing the title Danny. Did you install the new plate too, and did you experience the same thing?

  4. #4
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    I'm running Jim's plate, not Riva's...My hull is a little skewed from normal (mods), but I don't porpoise...

  5. #5
    KC Blue Thunder's Avatar
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    Yea I'm just trying to identify why when I had the wedge it wouldnt porpose at all but now that I have the new plate it does. almost tempts me into installing the wegde back just to see what'll do. I know of two other skis here in north Florida that are experiencing the same symtoms.

  6. #6
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    You can try, but note your speed before/after in the same conditions...if it does smooth out the ride, it will probably do so while slowing you down...

    Meanwhile, where's this write up about your heat exchanger experience?

  7. #7
    JFizzleJR's Avatar
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    Are you saying it didn't porpoise with the wedge AND Riva plate, or just the wedge and the stock plate?

    The porpoising is from (1) the angle the rideplate has and (2) the speed you're going. Some stock RXPs have bad porpoising. It's just the way the hulls are...It gets worse the faster you go. The 3-seat hulls don't have it as bad because they're heavier, planted in the water, and slower. You changed all of that with the rideplate mod. If the block-offs don't help then you'll have to shim the rear of the rideplate as Danny mentioned.

    Then add a 3Rude to see if the porpoising comes back

  8. #8
    KC Blue Thunder's Avatar
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    Meanwhile, where's this write up about your heat exchanger experience?


    I thought I added to your post already, Its worked flawlessly, Im very happy.

  9. #9
    KC Blue Thunder's Avatar
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    Quote Originally Posted by JFizzleJR View Post
    Are you saying it didn't porpoise with the wedge AND Riva plate, or just the wedge and the stock plate?

    The porpoising is from (1) the angle the rideplate has and (2) the speed you're going. Some stock RXPs have bad porpoising. It's just the way the hulls are...It gets worse the faster you go. The 3-seat hulls don't have it as bad because they're heavier, planted in the water, and slower. You changed all of that with the rideplate mod. If the block-offs don't help then you'll have to shim the rear of the rideplate as Danny mentioned.

    Then add a 3Rude to see if the porpoising comes back
    Wedge and stock plate James.

  10. #10
    JFizzleJR's Avatar
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    I wouldn't add the wedge back, but that's just me. I'm sure a couple of Corona in the front bucket would help with the porpoising
    Disclaimer: In no way am I advocating drinking and boating

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