Rudder dimensions

Discussion in 'Boat Design' started by Naval architecture, Dec 26, 2021.

  1. Naval architecture
    Joined: Dec 2021
    Posts: 1
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    Location: Algérie

    Naval architecture New Member

    How could i calculat my rudder dimensions for new ship if i got the ship dimensions ?
    Any help please
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    It must be large enough that Ndelta dominates the stability derivatives such that N is always negative for delta not equal to zero and positive for delta identically equal to zero for the hull geometry and all speeds selected. See PNA, Vol 3, Chpt IX of the 1989 edition.

    Really, your question is far too complex for a simple answer, though there are rules of thumb for given vessel size, shapes, and speeds. For the typical cargo vessel start at ~2% of the lateral area.
     
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  3. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    Yup...typically between 2-4%...the upper end on the more slower vessels.
     
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