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Porpoising Issue

Thread in 'Motors & Props' started by h20 addict, Jun 19, 2019.

  1. h20 addict

    h20 addict New Member

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    Hey Guys,
    I have a 06 901 CDX with 200 optimax with 10" fixed jack plate, in anything but
    calm water I have to trim all way down to keep from porpoising on me. Flat water
    no problem, trim up and run 60 mph. Can anybody help ?
     
  2. jerry shack

    jerry shack Well-Known Member

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    Try lowering your jack plate 1/2" at a time and see if that helps. It sound like it's to high and also what type of prop?
     
  3. h20 addict

    h20 addict New Member

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    hey Jerry, thanks for the reply, I was thinking it was too high, and I am running a tempest
    plus 23 pitch
     
  4. jerry shack

    jerry shack Well-Known Member

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    That prop is a surface piercing prop so it has a lot of bow lift and what type of jask plate is it who makes it. because some have a different degree of angle.
     
  5. h20 addict

    h20 addict New Member

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    Jerry, thanks again for your input, the jack plate is a slide master as far as I can tell, not
    many markings on plate, but it is fixed. If were to invest in an adjustable one, any one
    come to your mind. Would have to be manual budget won't go for other
     
  6. jerry shack

    jerry shack Well-Known Member

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    The one you have should be adjustable via a long adjustable rod in the center and also a bolt on both sides to loosen the 2 plates. if not sure send a pic of it.
     
  7. h20 addict

    h20 addict New Member

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    Jerry, thanks for your input, I lowered my motor to about 3" below pad, I think that helped
    a good deal. Waster conditions not the best to really tell. My jack plate is not movable, I know
    what you are talking about, with the rod in the middle, mine does not have such an animal.
     
  8. jerry shack

    jerry shack Well-Known Member

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    The rule of thumb is for every 1" of setback go 1/2" up. So your jack plate has a 10" set back so you measure from the pad with a straight edge and measure from the bottom of the cavitation plate to the straight edge. That's a good starting point. You can get a adjustable jack plate for around 300-500 bucks depends on the set back
     
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