Aluminium 55' fast cruising trimaran

Discussion in 'Boat Design' started by Two Bob Peter, Jul 8, 2017.

  1. Two Bob Peter
    Joined: Jul 2017
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    Location: Australia

    Two Bob Peter New Member

    Hi All
    New poster, experienced sailor, looking to build a fast cruising trimaran in aluminium. Similar design basis as Chris White Hammerhead 54 or Rapido 60. Plan is to commence construction approx 3 years time. Fabricate hulls at my factory (aluminium fabrication business) in Australia and then do fitout in SE Asia.
    Havent got a huge budget, but from experience I believe I have a good grasp of how much a venture of this size is going to cost. Looking to discuss plans, design etc with architect / engineers that may have done something like this before.
    Cheers,

    Peter
     
  2. JSL
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    JSL Senior Member

    Why not contact Chris white?
     
  3. Alik
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    Alik Senior Member

  4. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    What is your SOR that lead you to dictate the hull form as a Trimaran from the outset?
     
  5. Two Bob Peter
    Joined: Jul 2017
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    Two Bob Peter New Member

    I have been in touch with Chris, still working through his reply. As the Hammerhead is a composite design it will require a completely new approach to build from ally.
     
  6. Two Bob Peter
    Joined: Jul 2017
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    Location: Australia

    Two Bob Peter New Member

    I have owned a cruised a 49' alloy cat with my family on board a few years ago. I enjoyed the fast cruising and reduced transit times between ports. For this next project I don't need as much accommodation, would like to go faster. Also thinking (might be incorrect on this) that a trimaran build might be a bit faster due to the fitout requirements, basically a 55' mono fit out as against a 55' cat fitout. Obviously the amas and supporting structure will take time, but just aluminium hotworks with no fitout requirement. It also suits my build location.
    Cheers,

    Peter
     
  7. Nico Crispi
    Joined: Jun 2017
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    Location: NE FL & SOCAL

    Nico Crispi Junior Member

    Last edited: Jul 17, 2017
  8. petebrown
    Joined: Jun 2016
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    Location: AUstralia

    petebrown New Member

    Hi,

    I'm in Oz also and interested in these types of trimarans - just wondering if you are still pursuing this ?

    cheers
    pete
     
  9. Two Bob Peter
    Joined: Jul 2017
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    Location: Australia

    Two Bob Peter New Member

    Hi Pete
    Been away on other projects. Still interested in this build. Did get some communication from Chris White re the Hammerhead design. Don’t recall the exact text but recollection is that to recreate that particular design in ally is the same as starting with a blank sheet. I recall he was also worried about the weight.
    My previous vessel was a 49’ cat, cruising design with good performance and cruising weight of 7500kg. I still feel with the right design and construction principals ally is a viable option for this size tri, but I am speaking from a non-naval architect / engineer perspective and open to be proven wrong, or right!
    Ive still got research time before I need to start the build, so will keep researching ideas and concepts.
    Cheers,

    Peter
     
  10. Ilan Voyager
    Joined: May 2004
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    Ilan Voyager Senior Member

    All depends of your program.
    Nice amenities or spartan (that can go from the american luxury condo to the monastic cell)? Very fast, fast or simply rather fast? How many people? How many able sailors (solitary to five guys)? long range or short range? for tropics or any latitude? wild mooring or marina? Young children? Pets? There are a lot of factors.

    Yes an aluminium tri is viable, some alu trimarans designs have been built in the 80's in France. The French NA Sylvestre Langevins (retired since many years) designed a few.

    However there are some difficulties which have killed the alu trimarans 30 years ago;
    Absolute necessity of a NA knowing well trimarans and aluminium ship building. Langevin was a very good NA (just one of his activities) but he was also an outstanding engineer of metallic structures. So good that he taught a generation of structural engineers at the Conservatoire des Arts et Métiers of Paris.
    A lot of NA who tried in the 80's to imitate Langevin failed. Too heavy or structural problems. there is a lot surface, it's the main problem of the tris.
    Weight so the engineering must be top, the building must be first class preferably by an experimented aluminium shipyard as very light scantlings will have to be used on a sophisticated structure with miles of welding on thin sheets. It's pretty expensive, but mistakes are more expensive.
    A medium heavy cruising aluminium catamaran is far easier to design and build. more in the abilities of aluminium factory.

    Two examples of totally different alu tris by Langevin, see the pics;
    Djebel Amour, a super luxury floating condo able to sail correctly. The building was very, very, very expensive. 16m x 9.2m. The boat, 30 some years old is now a charter at Madagascar.
    [​IMG]

    [​IMG]


    Découvert, racing tri foiler 15.15mx9m. Always racing 36 years later. I've sailed 30 years ago on its sistership Ker Cadelac, a pleasure. Pretty fast, very seaworthy.

    [​IMG]


    [​IMG]
     
  11. n5pgo
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    n5pgo Junior Member

     

  12. n5pgo
    Joined: May 2014
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    n5pgo Junior Member

    I have been working on this same design in ACAD for years. I also worked in aluminum shipyards in states and Argentina. I have many, many, photos. As for the plans, you can have them. I am now too old and disabled to do this myself. My designs started with the basic Searunner, and scaled it up. The largest was a 70ft. Smallest a 44. My large design was posted on this site ages ago. My 60 used a stand-up engine room with pass thru walkway, semi-vented wings, and ketch rigged sail plan taken from the Creole (with the upside down main and mizzen staysail). Let me know if you want it and I send you the lot.
     
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