which one? single leg I strut or diverging leg V strut propeller bracket

Discussion in 'Boat Design' started by dirkpitt, Jan 30, 2014.

  1. dirkpitt
    Joined: Sep 2006
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    Location: turkey

    dirkpitt Junior Member

    can anyone help me about twin screw propeller brackets choice?

    which criterias important about choice of propeller brackets that will be I strut or V struts. Because i saw lots of sail yacht, motor yacht (not high speed), motor sailers with different propeller brackets. can anyone explain this?

    - motor sailer -----some i saw v brackets and also naca foil I strut.

    - sail yacht----- naca foil I strut or sail drive

    - motor yacht and trawlers----- diverging leg V strut also I struts

    also i couldn't find any documents about ---which type of boat, which type of propeller bracket---.
  2. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    It is all a mixed bag.

    But it ostensibly revolves around 2 issues
    1) Drag
    2) Strength.

    1) 2 legs have more WSA ie more drag, also more frontal profoile drag.
    2) 2 legs have more stability i.e. strength especially for grounding or impacts with submerged objects.

    There is of course a difference in cost between 1 leg or 2.

    Thus what are the risks and how are they mitigated.
  3. Easy Rider
    Joined: Oct 2009
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    Location: NW Washington State USA

    Easy Rider Senior Member

    The potential for a single leg strut to resonate to hull vibrations would seem greater. Just a thought but I'd go w the V strut.
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