Need a 29' OFFSHORE CAT design

Discussion in 'Multihulls' started by Shamaalah, Aug 29, 2011.

  1. Shamaalah
    Joined: Dec 2010
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    Shamaalah Junior Member

    hey folks

    Im looking for someone to put my ideas on paper for a 29ft offshore cat? The KD860 is almost what Im looking for but I think I can make better space out of 29ft hulls.

    1. I want a fuller bridgedeck forward for more berth space? some netting is good? bowsprit?
    2. An open style deck with separate entrances for both hulls facing aft? come up out of the hulls walk straight in the water? ala wharram woods
    3. flybridge style hard top? for 360 views? about 6' high from deck
    4. steps on hull transoms? ala everybody
    5. single engine nacelle center deck? ala waller etc
    6. long foldable single rudder aft of engine center deck? ala ?
    7. wheel steering center deck? ala mono hull
    8. curved ")" deck transom aft of wheel? I want very little 90 degree angles through out ? ala fusion etc
    9. access to front of boat thru center of deck with notched flybridge for head clearance?

    Ive basically took ideas from different cats and am trying to squeeze them into one small package and keep hopefully performance. I only need a penciled illustration at the moment any good illustrators out there to volunteer services? or small fee? the KD860 is the base for the drawing..... thanks!
     
  2. Dryfeet
    Joined: Aug 2010
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    Dryfeet Junior Member

    Okay, I'll bite but first a couple questions.

    Why 29'? Not 28, not 30 but gotta be 29.... why?

    Why a central rudder?

    Btw, Chris White did a 29' central rudder type design not too far out from your parameters. Check out his book, it's in there.
     
  3. Shamaalah
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    Shamaalah Junior Member

    Well im just using the KD860 as a guide. I will take any convincing argument on why I should go smaller? Trying a minimalist approach? more with less?

    a central rudder because i dont want twin rudders the interfere with the transom steps? Any pics of the Chris White design?
     
  4. Shamaalah
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    Shamaalah Junior Member

    just wanted to add that a 29' cat is actually 58 ft total length... thats alot of boat by any standards.

    PS looking for a mild hull flare with minimum wetted surface
     
  5. CatBuilder

    CatBuilder Previous Member

    If it helps any, rudders are quite narrow on cats - especially of this size. The rudder is only 2-3" wide, plus whatever cassette you put around it.

    If you do a kick-up rudder, you can still walk up your steps on either side of it.
     
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  6. Dryfeet
    Joined: Aug 2010
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    Dryfeet Junior Member

    Bob Oram is also an advocate of a single rudder on one side only. Might be better than a central rudder. Central rudders are both surface piercing and kelp, damage and sculch collectors. Brian E, however is an advocate of centralized foils on cats. Personally, I'm leaning towards the only symmetry being the hulls but with all foils (including rig) in one hull. (Nope, NOT quite a proa advocate and won't go there)

    There are also a variety of other ways to permit stern access with outboard rudders such as cutting away the inboard side of the hull at the last 3-5 feet of length.

    Sorry, no pics of the Chris White 29'er.
     
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  7. rberrey
    Joined: Oct 2010
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    rberrey Senior Member

    Look at some of the 8m micro class cats, scale them up 10%. Lot,s to look at, Roberto Barros bora bora? Ed Horstmans 27pc and on and on.
     
  8. Shamaalah
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    Shamaalah Junior Member

    yeah been looking at horstmans for years
     
  9. Corley
    Joined: Oct 2009
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    Corley epoxy coated

    John Shuttleworths 31' cat seems to meet most of your criteria except the centre mounted rudder, hardtop (could still use a bimini) and rear facing companionways. Its only 2' longer with lots of offshore passages to it's credit. You could fit wheel steering behind the mast step, any reason why you want wheel steering? Most of the time on a boat like this you would have the autopilot on while cruising most autopilots also have a remote http://www.john-shuttleworth.com/Fossailing-story.html
     

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  10. Shamaalah
    Joined: Dec 2010
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    Shamaalah Junior Member

    woooow love it thanks
     
  11. Shamaalah
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    Shamaalah Junior Member

    thanks for that
     
  12. rayaldridge
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    rayaldridge Senior Member

  13. jamesl
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    jamesl New Member

  14. Howaya
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    Howaya Junior Member


  15. jamesl
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    jamesl New Member

    Not the most handsome design is it?
     
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