Looking for some general info

Discussion in 'Outboards' started by AstroTux, Jul 20, 2006.

  1. AstroTux
    Joined: Jul 2006
    Posts: 15
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: United Kingdom

    AstroTux Junior Member

    Hi,

    I'm presently designing my own 30ft Catamaran, and was wondering about how to go about determining the right sized engines for it?

    I've no idea about final all-up weights yet for the boat, but I'd be looking at a couple of tons at least, I'm sure.

    Any recommendations on manufacturer? I'd prefer economy vs. power, and want something very reliable. What sort of cost would I be looking at for new engines (I'd need two)?

    Any recommendations on props?

    Best regards,
    Robin.
     
    AstroTux, Jul 20, 2006
    #1
  2. gonzo
    Joined: Aug 2002
    Posts: 16,819
    Likes: 1,726, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you follow standard design methods, you'll determine a displacement and speed target first. The HP of engines, props, transmission ratios etc. are calculated to attain those targets. You also have to take into consideration, hull fineness coeficient, dynamic lift, hydro and areodynamic drag, etc.
     
    gonzo, Jul 24, 2006
    #2
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