Porpoising problem
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Porpoising problem

  1. #1
    Great White North 98xc800's Avatar
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    Default Porpoising problem

    I took my 76 Challenger out for the first time today. I have never driven a jet boat before. When I get it up on plane, about 25-30 mph, it starts to porpoise like crazy. it increases until the hull jumps right out of the water, slapping back down hard. I didn't have the balls to try and power through.

    I have a hydraulic Place diverter, but it wasn't working today (loose connector). Is trimming these things that critical? Or is there something else I should look at?

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  3. #2
    Senior Member DuaneHTP's Avatar
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    Repair your diverter and try it again. You'll be amazed at the difference.

    Duane HTP

  4. #3
    Great White North 98xc800's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    Repair your diverter and try it again. You'll be amazed at the difference.

    Duane HTP
    I already fixed it. It was just a loose connection in the wiring.

    Would raising the nozzle reduce or increase the porpoising? or is it a trial and error deal?

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  6. #4
    Senior Member DuaneHTP's Avatar
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    Trial and error. Each boat is different.
    Duane HTP

  7. #5
    Great White North 98xc800's Avatar
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    Thanks, I will try it again on Monday. I have 2 more weeks here on the Colorado before I have to return to the frozen North.

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