Power cat with sail hulls

Discussion in 'Multihulls' started by 2farnorth, Dec 18, 2008.

  1. Ernie Travers
    Joined: Feb 2009
    Posts: 10
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    Location: Auckland, New Zealand

    Ernie Travers Junior Member

    Hello 2farnorth,
    I did not read your Specifications before I answered.
    I am an older guy with a good marine education and an amazing amount of experience.
    I am not flash on the computer as my hands on skills are in more demand.
    Running a boatbuilding operation, I have had to do everything in the factory at some time from being a managing director, all office work and all building trades work.
    I had to design new hulls when needed and the result was spectacular. It took me by surprise.
    None of us know everything and we all know something. Cooperation will get us everywhere.
    Good luck with your project. I would like to follow it with interest.
     
  2. masalai
    Joined: Oct 2007
    Posts: 6,823
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    Location: cruising, Australia

    masalai masalai

    To power you need a long and skinny hullform say 40ft loa and 2 ft 3 ins max beam wl on a similar draft, chines below the wl will give a displacement MAX in the vicinity of 5 tonnes (about 11000 lbs) and Rick Willoughby may help you to optimise it for efficiency....

    Remember do not EVER overload the design as cats are critical on weight issues... google and download a copy of freeship / delftship free of the russian version (stable) from here http://freeship-plus.pisem.su/indexEN.html - then click on <support> then <downloads> and choose one that is beyond "test" (ver 2.95) and enjoy the learning experience...
     
  3. 2farnorth
    Joined: Oct 2008
    Posts: 38
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    Location: Stillwater, Mn, USA

    2farnorth Junior Member

    Ernie, I would be interested to see the hulls you designed. If you all want to see what I am shooting for, compu craft down in Australia has several designs that I like, check out the C-C 38/40 power cat at this web site http://www.ccplans.com/index.cfm?Do=View.Page&PageID=41 , but I do not have $8500 laying around, I figure if I can get some hull plans for under $1000 I could do some modifying to suit my needs.
     
  4. 2farnorth
    Joined: Oct 2008
    Posts: 38
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    Location: Stillwater, Mn, USA

    2farnorth Junior Member

    Masalai, Thanks for the reply. I like to here from you guys down under as it seems catamarans are the norm down there. I am not a designer so I guess I am just looking for the hull design that you are talking about. 40' LOA and narrow at the water line.
     
  5. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 121, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    Or else go for the one I am building (boats are a compromise of wants and needs) - - click the link at the bottom of my post "My little piece" in hyperlink blue and underlined.... there is a changed underwater line powercat range as well to look at.... Pay 2 or three people to help you build and you are away for about Au$300,000.00 if you build in Aussy
     
  6. Ernie Travers
    Joined: Feb 2009
    Posts: 10
    Likes: 1, Points: 0, Legacy Rep: 30
    Location: Auckland, New Zealand

    Ernie Travers Junior Member

    Helo 2farnorth,
    I didn't read your thread properley before I answered and haveonly just found the forum again.
     

  7. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 121, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    2farnorth, My initial kit cost about AU$60,000 + Au$6000 for build plans & rights for one boat - the difficulty is in the z-press which is water heated to set the 'techniglue' and on a 30deg celsius day ambient can do a join every 20 minutes - 8ft side of an 8' x 4' routed panel - 4 kits will fit inside a 40' standard container, and all the panels on a pallet weigh 1100kg and the other pallet has all the chemicals and rolls of glass etc. there is also a set of build frames that should last the 4 builds if used carefully. you would need a 'true' leveled concrete floored shed about 30ft x 50ft for comfort and a sea-container as your tools lockup along with corded powertools of a jigsaw with metal cutting blades (glass destroys the others too quickly) a 4" anglegrinder with sanding disks, a belt sander (small and not expensive), an aircompressor for powering the "helicopter" sanding tool for fairing the large flat surfaces (all must be bogged and sanded back after removing the peelply and painted inside with at least "flowcoat" and externally with 2 part marine paint and specialist underwater coat... and for the curves 4-6 handheld small sanders (find extra volunteers to help in this "painful" but necessary task) oh and a cheap electric drill to mix the epoxy and stuff and a pair of cheap electric screwdrivers - I am sure I have missed several things, but is is fun and visually rewarding... Including tools and sundry other costs and help - AU$75K so far...

    There is a powercat version of this boat - slightly skinnier and different underwater lines - in-keeping with current displacement high speed power design here in Aussy

    Then comes the hard fiddley part of fitout and rigging etc....:D:D:D:D
     
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