Design principle of triangular rudder planform

Discussion in 'Sailboats' started by Nachtvlinder, Jun 11, 2021.

  1. Nachtvlinder
    Joined: Oct 2014
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    Location: Netherlands

    Nachtvlinder Junior Member

    Recently saw a Cape North 43 on the hard (a design from Ted Brewer) with an interesting rudder planform. More designs from that era seem to have a rudder with a chord widening going further down, however mostly not this extend:

    https://sailboatdata.com/storage/images/sailboat/drawing/cape_north_43_drawing.jpg

    Does anyone know the design principles of planforms like this? What are the advantages compared to more rectangular designs and what insights led to stop designing planforms like that?
     
  2. Doug Halsey
    Joined: Feb 2007
    Posts: 528
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    Location: California, USA

    Doug Halsey Senior Member

    It might make more sense to consider the rudder and the skeg it's attached to as a single unit with a quadrilateral planform, with the rudder itself acting like a very large flap.
    TriangularRudder.jpg
     
    JotM likes this.
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