Very Silly Question

Discussion in 'Boatbuilding' started by Woodser, May 20, 2004.

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  1. Raggi_Thor
    Joined: Jan 2004
    Posts: 2,457
    Likes: 64, Points: 0, Legacy Rep: 711
    Location: Trondheim, NORWAY

    Raggi_Thor Nav.arch/Designer/Builder

    Crude speed estimate in knots = 3 to 4 x (HP per ton) ^ 0.5
    If you boat weighs one ton (total) and you have 25HP you can estimate speeds like 3x5 = 15 knots to 4x5 = 20 knots.
     
    Raggi_Thor, Feb 27, 2007
    #16
  2. Lew Morris
    Joined: Jun 2001
    Posts: 124
    Likes: 4, Points: 18, Legacy Rep: 92
    Location: Pismo Beach, Ca

    Lew Morris Industrial Designer

    Unseen...

    Sorry, I'm not an naval architect/engineer.

    But front the link to the 20' PT built by Jim Treleaven...

    "...it has a 5 foot beam and is powered by a 35 hp Jet Ski engine."

    At 20%, you are talking about a 16 foot hull... I'd think you could stuff a "jetski" plant into that length.

    Build light; cold molded plywood and epoxy!
     
    Lew Morris, Feb 27, 2007
    #17
  3. unseencasper
    Joined: Feb 2007
    Posts: 5
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    Location: egypt

    unseencasper Junior Member

    ...i wanna know which engin u prefer..marine nitro or gas engin,,
    or electric motor..
     
    unseencasper, Mar 1, 2007
    #18
  4. SamSam
    Joined: Feb 2005
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    Location: Coastal Georgia

    SamSam Senior Member


    I know this thread is almost 3 years old, but I think this is the sort of boat he was asking about. Does anyone know of any plans for something like this that you might be able to put a car or truck on? Sam
    [​IMG]
    [​IMG]
     
    SamSam, Mar 2, 2007
    #19

  6. unseencasper
    Joined: Feb 2007
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: egypt

    unseencasper Junior Member

    i need information about hydrofoils,,the material used in it...length limitation...ect..plz help
     
    unseencasper, Mar 6, 2007
    #20
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