New power cat - help please!

Discussion in 'Powerboats' started by foxfish, Aug 2, 2008.

  1. Guest625101138

    Guest625101138 Previous Member

    There is a lot of detail in designing any boat. Hopefully a good designer/builder has sorted most of the problems so there is advantage in getting good plans.

    Thinking about designing a boat should make you a more astute observer so it is not wasted effort to do the homework.

    You should try to get test rides in particular boats as well. Often it is cheaper simply to buy the finished product than all the trouble of building.

    Rick W.
     
  2. Seagem
    Joined: Jan 2009
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    Location: Cayman Islands

    Seagem Junior Member

    Sounds good for a catamaran...

    I am in the process of putting together a design for a pocket catamaran cruiser able to range the entire Caribbean and the Sea Knife concept might work well, since fuel efficiency at 22/25 knots cruising speed is of paramount importance...

    http://www.boatdesign.net/forums/mu...r-catamaran-design-recession-times-25620.html

    I'd like to know more about it and your views as to its suitability for a catamaran...

    My last sailing boat was a catamaran I sailed with wife and 10 years old daughter from France to the Cayman Islands: while the Atlantic crossing was reasonably fast in 14.5 days compared to previous passages in a monohull, it was very tiring without an experienced crew to rely on: my next boat will be a medium displacement 45' monohull with centreboard, unstayed mast and a modified Aerorig or Dyna rig...
     
  3. foxfish
    Joined: Jun 2008
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    foxfish Junior Member

    Hi guys I am back with more questions :)
    I have been given a phantom 21' power boat, the boat only has a 5'6'' beam.
    I was thinking about cutting the boat in half right down the length & adding a center piece to in effect turn the mono hull into a catamaran!
    Is this feasible?
    Thanks Fox.
     
  4. rasorinc
    Joined: Nov 2007
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    rasorinc Senior Member

    How DEEP is the hull? you will be raising the sole way up and will need to raise the sides. you need a tunnel at least 18" above the water. Sounds like a lot of work to do on an inexpensive hull.
     
  5. foxfish
    Joined: Jun 2008
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    foxfish Junior Member

  6. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

    How do you plan on holding the 2 half hulls together? What materials?
     
  7. f250
    Joined: Feb 2009
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    f250 Junior Member

    This is a nice design that you would like i think.
    We saw this at the Belgian boat show yesterday.
    Resque cat that can lower the front mid section for boarding .

    Greetz Alain.



    Sorry for the bad English.
     

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  8. Frosty

    Frosty Previous Member

    You dont need to build a boat yourself in this fiscal climate. There must some good deals all over.

    Build your own and you could very well end up with a dog,--a worthless dog too.

    Buy at least a professional hull and it will sell when you want to. keep to specs and you will know for sure what performance you are going to get.

    Cats are worse, they can be a disaster.
     
  9. f250
    Joined: Feb 2009
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    Location: belgium

    f250 Junior Member

    low weight

    Maybe you can use som surplus tubes from henshaw to be modified to be used in your project?

    There is some good software to analyse cat designs from aero marine research.

    Greetz Alain.



    Sorry about the bad english.
     

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  10. foxfish
    Joined: Jun 2008
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    foxfish Junior Member

    Frosty, you may well be right but I have now cut the phantom in half, straight down the length with a motor powered 9'' diamond blade disc cutter!
    I have cut away the transom too so I now have two pieces 19' long, they are being delivered to my house later this week.
    I have previously built two cats neither of them worked very well but I have learnt a lot from their builds, this is my hobby I just cant wait to get stuck in.
     
  11. f250
    Joined: Feb 2009
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    f250 Junior Member

    Foxfish wat will de beam be if you ad a midsection of 1m?
     
  12. foxfish
    Joined: Jun 2008
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    foxfish Junior Member

    The phantom hull measured 5'6'' at the transom, I will make a 2' tunnel so the finished boat will be 7' 6'' x 19'.
    I will post some pics very soon.
     
  13. f250
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    f250 Junior Member

    Still no pics or progress ?
     
  14. Jimboat
    Joined: Feb 2002
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    Jimboat Senior Member

    foxfish - looks like a fun project! you may want to check out "Tunnel Boat Design" material here.
     

  15. foxfish
    Joined: Jun 2008
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    foxfish Junior Member

    Well yes in fact I finally had the two halves delivered yesterday!
    I have been starring at them all day!
    After revising & thinking about how to build the center tunnel I still haven't made up my mind, there seems to be a few options like glassing over ply or making a mold - going to give it plenty of thought...
    Pics tomorrow.
     
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