What height should I set the cavitation plate on this boat?

Discussion in 'Hydrodynamics and Aerodynamics' started by suprathepeg, Oct 16, 2015.

  1. suprathepeg
    Joined: Jul 2015
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    Location: Winnipeg, Canada

    suprathepeg Junior Member

    Old 3 point, it has three flat planing surfaces the front two are about 4" lower than the main hull. Should the cavitation plate be mounted at the transom height or the height of the front planing surfaces?



  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    It will be all trial and error to get it dialed in, and will depend on the exact motor, load, prop, speed, where you sit, how you plan to use the boat etc.
  3. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    It's a ventilation plate and it should be approximately an 1" above the bottom of the transom bottom, on the centerline, if the keel line was extended directly aft. The actual placement will depend on how she performs, so typically a jack plate is used to find the sweet spot, which could be about anywhere across a few inches.
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