Structural Design of 18' Skiff

Discussion in 'Powerboats' started by Crashcart2, Feb 23, 2024.

  1. Crashcart2
    Joined: Feb 2024
    Posts: 2
    Likes: 0, Points: 1
    Location: Virginia

    Crashcart2 New Member

    I'm currently working on the design of an 18' skiff with a design waterline of 8", full load displacement of ~ 1800 lbs. This boat is meant to be powered by a 115hp outboard on a standard 20" transom height. Max speed around 40 knots most likely. A lightship weight in the ballpark of 750lbs (hull only) is expected.

    Looking for advice on how to design the boat's stringers/bulkheads and transom structures without overbuilding. This boat would be built as a one-off using composite core materials and glass. The transom would most likely be of a coosa board core.

    I've read Gerr's book, any other recommendations?

    Does anyone know how to factor in the additional loads of a jack plate on a transom as well? Thanks !
  2. fallguy
    Joined: Dec 2016
    Posts: 7,643
    Likes: 1,688, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    If you follow Gerr, you'll overbuild.

    I recommend you buy a plan and if nothing else use it for guidance. A lot of people want to design and build their own boat, but building is enough trouble and has a low enough success rate.

    Here is one you could modify to 18' and core changes. Just make sure to not use light 4# foam. That is a totally different animal.
    bajansailor likes this.
  3. Crashcart2
    Joined: Feb 2024
    Posts: 2
    Likes: 0, Points: 1
    Location: Virginia

    Crashcart2 New Member

    I appreciate the advice!

  4. TANSL
    Joined: Sep 2011
    Posts: 7,378
    Likes: 706, Points: 123, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    It could help you in your project with the calculations you request and with other aspects such as stability, etc. If you wish, send me information about what you have already done and what you want to achieve.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.