Equations/Fromulas

Discussion in 'Boat Design' started by monrosm@shrewsb, Nov 7, 2006.

  1. monrosm@shrewsb
    Joined: Apr 2006
    Posts: 50
    Likes: 1, Points: 0, Legacy Rep: 20
    Location: England

    monrosm@shrewsb Junior Member

    Does any one know any calculations or formulas concerning propellers. As in does any one know the equation for thrust of a propeller or the water displaced by 1 rotation of a propeller.
    Any equations welcome
    Thankyou
    Stefan Monro
     
    monrosm@shrewsb, Nov 7, 2006
    #1
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    T=1/8*rho*pi*D^2*(Pn-Va)^3

    ....assuming invisicid irrotational perfect flow.

    However the question is too unspecific and the answer above is most likely incorrect as a test answer. Get your hands on any basic Naval Architecture text from about 1890 on and you will get the current theory de'joure. Modern theories can be broken down into lifting line, lifting surface, and energy methods....pick your posion.
     
    jehardiman, Nov 7, 2006
    #2
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