Weight effect on trim

Discussion in 'Hydrodynamics and Aerodynamics' started by jbo_c, Dec 1, 2022.

  1. jbo_c
    Joined: Jul 2017
    Posts: 82
    Likes: 11, Points: 8
    Location: Gainesville, GA

    jbo_c Junior Member

    On a typical flat bottom Jon boat hull as pictured, would a weight placed fore affect the trim more than the same weight placed equidistant of center aft? (due to the change in hull shape/submerged volume)

    Part of me feels like this is a dumb question, but part of me thinks it’s legitimate. I can’t decide. Now I’m thinking probably yes, but maybe not much different unless extremely heavy vs weight of the boat.

    Jbo

    1833D9A5-FC87-42FD-A294-6C1F87E77C64.jpeg
     
  2. gonzo
    Joined: Aug 2002
    Posts: 16,805
    Likes: 1,721, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Yes it would because the waterplane aft is larger. That means that for the same distance it gets submerged, the aft section has more volume. Or to look at it from a different perspective, the aft section needs less immersion to have the same volume (an buoyancy) than the forward.
     
    DCockey likes this.
  3. jbo_c
    Joined: Jul 2017
    Posts: 82
    Likes: 11, Points: 8
    Location: Gainesville, GA

    jbo_c Junior Member

    Thanks. That’s what I really wanted to think, but kept second guessing myself.

    Jbo
     
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