12 foot powercat

Discussion in 'Powerboats' started by riskmore, Sep 27, 2009.

  1. jonr
    Joined: Sep 2008
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    jonr Senior Member

    The deep Vs in some Hobie hulls (like a H16) are like that for sailing - to replace the daggerboard. I'd use a rounded hull shape - more like a Tornado or H18 sailing catamaran; this will have less drag.
     
  2. rosbullterrier
    Joined: Feb 2005
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    Location: Cornwall, UK

    rosbullterrier Junior Member

    Yes I appreciate what you say jon, which is why it would be waste to use a sailing cat as a power boat.
    The need is discover the specs best suitable for the purpose - a low power equivalent of a catamaran power racer!
    I'm sure a lightweight version of Sabahcats design would be perfect with some mods. It doesn't need to stand pounding from the sea but I understand, according to Froudes law, a longer displacement hull is faster.
    But how long is neccessary?
     
  3. sabahcat
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    sabahcat Senior Member

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  4. monopoly 46
    Joined: Jan 2010
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    Location: lake of the ozark Mo. U.S.A

    monopoly 46 Junior Member

    hey i am looking for a convincer cat 10ft if any one got one or got a hotdog power boat 13ft can you email me at uvcoatings@sbcglobal.net

    thanks!!!!!!
     
  5. rosbullterrier
    Joined: Feb 2005
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    Location: Cornwall, UK

    rosbullterrier Junior Member

    'The deep Vs in some Hobie hulls (like a H16) are like that for sailing - to replace the daggerboard. I'd use a rounded hull shape - more like a Tornado or H18 sailing catamaran; this will have less drag'

    After reading into hull design by Malcolm Tennant, I now understand the concept of least wetted hull area and soft chine or rounded hull. The Tornado seems especially suitable, particularly being a DIY boat.
    How about - making one Tornado hull, cutting it straight along the keel from stem to stern, closing the cut two halves with straight sides and joining the two halves now at the top with bracing?

    Would that not be the lightest cat?
     

  6. jonr
    Joined: Sep 2008
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    jonr Senior Member

    You might take someone's old worn out thundercat/zapcat and replace the hulls with aluminum (say similar to a pontoon boat hull). Or perhaps fix the original hulls just enough to use them as inflatable molds for a fiberglass replacement hull (that might still use air inflation for extra rigidity).
     
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