Rudder dimensions

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

  1. Naval architecture
    Joined: Dec 2021
    Posts: 1
    Likes: 0, Points: 1
    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
    Posts: 3,788
    Likes: 1,181, Points: 113, Legacy Rep: 2040
    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.
    bajansailor likes this.
  3. Ad Hoc
    Joined: Oct 2008
    Posts: 7,807
    Likes: 1,703, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Yup...typically between 2-4%...the upper end on the more slower vessels.
    bajansailor and jehardiman like this.
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.