how deep should prop be

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  • bmd8991@aol.com
    Junior Member
    • Jun 2021
    • 24

    #1

    how deep should prop be

    Friends
    I put this old boat back together and made a lot of decisions on my own without knowing a lot about boats. Now that I have had it on the water many times, it seems that it takes a few feet before the prop really gets the boat going and it is skimming really fast on the surface like I want. In other words, once the nose is down, the prop is closer to the surface and it goes fast.
    So I think the outboard and prop is too deep.
    Take a look at the pics. The water line is above the wooden mount with the hole in it.
    How deep should the prop be from the surface?
    Thanks for suggestions
    Brian
    Attached Files
  • LibertyMKiii
    Senior Member
    • Dec 2018
    • 126

    #2
    I am by no means a boat building expert, but it is very normal for the boat to be sluggish initially until it planes.
    There are various prop designs that do better at acceleration and low speeds, but there will always be some of this behavior until the boat gets up out of the water.

    A general rule of thumb is to have the center line of the prop inline with the bottom of the hull or sponsons.
    Attached Files

    Comment

    • bmd8991@aol.com
      Junior Member
      • Jun 2021
      • 24

      #3
      Thanks Liberty, that gives me an idea where to start

      Comment

      • 1coopgt
        Senior Member
        • Feb 2019
        • 417

        #4
        I think Liberty nailed it. Then adjust up or down angle from there.

        Comment

        • Wayne Walker
          Junior Member
          • Jul 2022
          • 3

          #5
          That work for a cat hull, how does that work on a mono hull?

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