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Thread: how deep should prop be

  1. #1
    Join Date
    Jun 2021
    Location
    IL
    Posts
    18

    Default 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
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  2. #2
    Join Date
    Dec 2018
    Location
    TX
    Posts
    122

    Default

    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.
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  3. #3
    Join Date
    Jun 2021
    Location
    IL
    Posts
    18

    Default

    Thanks Liberty, that gives me an idea where to start

  4. #4
    Join Date
    Feb 2019
    Location
    NY
    Posts
    385

    Default

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

  5. #5
    Join Date
    Jul 2022
    Location
    FL
    Posts
    3

    Default

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

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