Extra floatation to avoid full capsize

Discussion in 'Multihulls' started by trip the light fandango, Oct 9, 2019.

  1. gonzo
    Joined: Aug 2002
    Posts: 13,528
    Likes: 365, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    The problem with mast top flotation devices is that they do not prevent capsizes. They may prevent the boat from completely turning turtle. However, in the sea conditions a cruising cat capsizes, and the speed at which it does it, the flotation device would have to be very large and deploy very fast to be effective. Shortening sail and self-release sheet clutches are better ways of preventing capsizes. Of course there is nothing better than good seamanship.
  2. TANSL
    Joined: Sep 2011
    Posts: 5,686
    Likes: 172, Points: 73, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    You are right to say that mast top flotation devices is that they do not prevent capsizes. But it is also true that some of the best navigators in the world have overturned with their ships. That is why to prevent capsizing, something else is needed.

  3. trip the light fandango
    Joined: Apr 2018
    Posts: 278
    Likes: 48, Points: 28
    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    Thank you those that added to this thread, before it gets covered over by more current threads there's some points that it are probably worth making..low volume floats are slower but safer.. but by the time you've added cruising extras some added volume can be compensated .. somewhere around 95 to 120% is likely.,this is extra load on structure, fast trimarans like to be light. If a float was designed like Dolfimans proposal and the top of the float was designed to foil/drive to the surface when most of the lee hull is submerged, increasing the volume could be safe[r],.. as long as the trimaran doesn't lose too much forward momentum. No particular order,..just for the acronym..ha

    Floatation in the head of the sail.
    Extra floatation contained in hulls to counter swamping.
    A short strong mast,low volume floats
    Reserve buoyancy midship a gunwale height
    Extra diligence ,reef early
    Don't cleat main in gusty weather when pushing hard
    Last edited: Oct 16, 2019
Similar Threads
  1. sigurd
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.