planning planing hull?

Discussion in 'Boat Design' started by previah, Mar 2, 2004.

  1. previah
    Joined: Mar 2004
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: van hasseltlaan

    previah Junior Member

    Hi all,

    For the school project I have to design a patrol boat with cruising speed 12 kn and maximum speed of 30 kn. In the preliminary design I came up with the waterline length of 41 m. From this It's easy to calculate the displacement speed: 1.34*LWL(feet)^0.5 = 15.5 kn. If I stubborn enough not to lengthen my original length (thus 41 m), is it means that I'm forced to design (semi) planing hull instead of displacement hull?

    thanx in advance,
    -previah-

    PS: I came across in the internet the formula to include the effect of displacement in the hull-speed formula (http://potter-yachters.org/manyways/hullspeed/). With this I can rise the hull speed considerably. But still with LWL = 41m, It can't go faster than 30 kn.
     
    previah, Mar 2, 2004
    #1
  2. CDBarry
    Joined: Nov 2002
    Posts: 824
    Likes: 57, Points: 28, Legacy Rep: 354
    Location: Maryland

    CDBarry Senior Member

    Google "kamen" AND "fishmeal" for a planing boat calculation program.
     
    CDBarry, Mar 2, 2004
    #2
  3. SailDesign
    Joined: Jan 2003
    Posts: 1,964
    Likes: 151, Points: 73, Legacy Rep: 650
    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    CDB - What happened to Fishmeal? I haven't "seen" him around for a while anywhere...
    Steve
     
    SailDesign, Mar 2, 2004
    #3
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