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Rudder Alignment

Discussion in 'Technical Discussion' started by Crglmb, Mar 11, 2008.

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  1. Crglmb

    Crglmb New Member

    Joined:
    Sep 15, 2005
    Messages:
    10
    Location:
    San Diego
    Need help with rudder alignment, on a 56' Sport yacht, Top speed 35knts.
    Are there any marine architect's out there, that have experience in this area.
    I have heard so many conflicting opinions toe-in or toe-out? Which is it and why. Thank you.
  2. CODOG

    CODOG Senior Member

    Joined:
    Jan 25, 2007
    Messages:
    399
    Location:
    Bournemouth, southern England
    What sort of deadrise does she have aft ?
    Any sprayrails that run all the way aft to the transom ?
    Do you have prop tunnels ?
    How far forward from the transom are the rudders....say to the trailing edge ?
    What sort of distance do you have from the prop blades to the leading edge of rudder ...say as a fraction of prop diameter ?
    Do you have any running trim issues, such as excessively flat, or excessively stern down at speed ?
    What sort of rudders are they....totally flat plate, aerofoil section or wedged section ?
    Do they have cavitation plates ?

    You could see some lift at the stern at speed by toeing the rudders out on leading edges, depending on a few factors, and conversely see the stern sink down slightly at speed by toeing the rudders in on leading edges....Answering the above will allow a more considered answer:)
  3. Crglmb

    Crglmb New Member

    Joined:
    Sep 15, 2005
    Messages:
    10
    Location:
    San Diego
    Have pics of boat out of water

    I have some pictures that I can email to you, my email is crglmb@cox.net
    Craig