more questions on powercat design

Discussion in 'Powerboats' started by northerncat, Apr 16, 2007.

  1. northerncat
    Joined: Jan 2007
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    Location: australia

    northerncat Senior Member

    is it easier to drive an assymetric catamaran or a panga longboat that have identical beams?
    sean
     
  2. northerncat
    Joined: Jan 2007
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    Location: australia

    northerncat Senior Member

    well i built a scaled down version of my 6m cat to serve as a dinghy and to see what if anything i might like to change, at the moment im thinking of adding a foil to it to see whether i would gain any performance increase would this be worthwhile do you think? if i do are there any opinions on how wide the length of the foil ie skinny or wide also is it better to go witha symmetric foil like a naca 12 or to use a more of an aeroplane wing shape?
    some photos here
    http://www.hostmybb.com/phpbb/viewt...&postdays=0&postorder=asc&start=0&mforum=easy
    sean
     
  3. yipster
    Joined: Oct 2002
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    Location: netherlands

    yipster designer

    my take is long strong triangled beams plus all the above ( and asymetric hulls ;-)
    edit: added some bulkheads pics alla shuthleworth
     

    Attached Files:

  4. Bullshipper
    Joined: May 2008
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    Location: Mexico

    Bullshipper Bullshipper

    We need a lot more information to even attempt to answer these questions.

    A lot depends on
    Whether the hull has a cabin or is a CC.
    Total weight to figure panel loading
    Distance between centers on frames running port to starboard
    What ply are you using, what is the layup schedule
    Motor size, top speed expected.
    Floor thickness and glue/putty system, stringer type and centers under floor boards
    Spacing, size on stringers to form box inner under gunwhales from bow to stern, linered or unlinered gunwhales
    tunnel width, beam, planning sponson, height between tunnel and deck? Are there any steps on the deck?
     
  5. masalai
    Joined: Oct 2007
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    Location: cruising, Australia

    masalai masalai

    Oh for the love of it? You are in the home of performance powercats - why not BUY one? sharkcat, powercat, plus a dozen or so more manufactured and ready to go - even with survey to commercial standard - used by coastguard and a lot of other folk who have proven the design.... a home build powercat, I think, will not be usable in Australia. check current design rules.... there are changes.... Sail boats are still left to amateur builders not power...
     
  6. northerncat
    Joined: Jan 2007
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    Location: australia

    northerncat Senior Member

    actually for the moment im just chasing info for a foil for the dinghy, so this is where im coming from will i get a performance gain with a foil given im only powering it with a 3.6hp and if so how long should i make the foil etc
     

  7. northerncat
    Joined: Jan 2007
    Posts: 170
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    Location: australia

    northerncat Senior Member


    actually it is for the love of it that i would build one(that and the fact that it would work out significantly cheaper for me (3000) to build than buy) i have looked into the new boating plate and this is part of the reason for going to 6m, theirs a few hoops to jump through now for a powerboat but its not insurmountable(means i dont need to calculate bouyancy), sharkcat is going to cost in the region of 30-40000 and thats probably just the hull
    sean
     
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