Small Surface Piercing Trimaran Foiler

Discussion in 'Multihulls' started by Doug Lord, Jan 15, 2014.

  1. rcnesneg
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    rcnesneg Senior Member

    I love your project! I'm hoping maybe sometime I'll make a foiling trimaran! Until then, i'll have to be happy with my non-foiling trimaran. Had you considered a anti-pitchpoling bow like on some surfskis for the Vaka? If the top edge will plane its way upward, it shouldn't have as much problem, although it might still bury the lee float, I don't know.

    Here is what I'm talking about:
    [​IMG]
     
  2. rcnesneg
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    rcnesneg Senior Member

    I found something of potential interest to you, You are probably aware of the Hydroptere prototype that was made, probably around 20 feet long as I recall. There are two quick shots of it foiling in this video about 15 seconds in: https://www.youtube.com/watch?v=MdUyLxVa6xQ There seems to be a massive lack of information on that prototype, but I heard it went to some museum somewhere. If you have any other info, I'd like it.
     
  3. Gary Baigent
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    Gary Baigent Senior Member

    Go to the French site: http://foils.wordpress.com/
    Fred Monsonnec has all the information on the Hydroptere 20 foot proto, he even cleaned the boat up for various displays.
     
  4. Doug Halsey
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    Doug Halsey Senior Member

    Craig : It's been 6 months since your last post. Do you have any more activity to report?
     
  5. rcnesneg
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    rcnesneg Senior Member

    Gary, is there any info on that website? All I saw was a quick blog post about it in a display. Not much in the way of technical information.
     
  6. Gary Baigent
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    Gary Baigent Senior Member

    Here is some information - I have more but will have to hunt it down.
    LOA - 6,45m
    LHull - 6.09m
    BOA - 7.75m
    mast - 9.5m
    foils - 1.95m
    weight - 135 - 150 kgs
     

    Attached Files:

  7. rcnesneg
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    rcnesneg Senior Member

    It looks to me like there are actually two old Hydroptere prototypes.

    The first one I think uses a Tornado main hull, and is associated with Bernard Deguy and Eric Tabarly around 1976, possibly to do with the Trimaran Paul Ricard, pictured here: [​IMG]

    The second, which I'm more interested in, seems to be Alain Thebault's project, and seems to be 1988-1992 ish, Possibly with an A class or Tornado main hull. Apparently it is a 1/3 scale prototype of Hydroptere.[​IMG]

    This link seems to mention some stuff about it.
    http://hydroptere.free.fr/frames/historique/history.htm

    Doug Lord also posted this video in the Hydroptere thread. It shows both, at 0:26 is the 1976 one, and at 0:50 is the 1991 boat. https://www.youtube.com/watch?v=xdVl4TVVAXw

    Any technical info would be appreciated. I'm interested in building one, using the main hull from my Trimaran as a base. It was originally designed with this in mind, and it only weighs about 40 pounds, a lot less than a tornado. I'm sure Craig(Kotuku) and Doug(Broomstick) have lots of ideas, and probably a fair amount of resource information they have acquired.
    Here is the my Tri, Velocity.
    [​IMG]
     
  8. Gary Baigent
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    Gary Baigent Senior Member

    The original basic version was Tabarly's, and Thebault worked with him; I'm sure it is the same boat with Tornado main hull but Thebault's was more developed, new floats, different rudder setup, bow sprit, trampoline and so on. However could be wrong. The display and fast sailing shots are Tabarly's original.
     
  9. rcnesneg
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    rcnesneg Senior Member

    There appear to be videos of both, the orange/wood version and the white/composite version. There are also displays of both, so maybe they had two hulls of the tornado and basically everything was duplicated by that point so they have two displays?
     
  10. rcnesneg
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    rcnesneg Senior Member

    Do we have any technical info on Kotuku and Broomstick?
    Namely, I'm after the following:
    LOA
    Beam
    Mast height
    Weight
    Sail Area
     
  11. Doug Lord
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    Doug Lord Flight Ready

  12. Doug Halsey
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    Doug Halsey Senior Member

    Also, if you can't find what you want to know, just ask. You can post here, or send me a PM.

    I don't think the mast height is given anywhere. For the usual, smaller rig it's 20' 8" above deck. For the rarely used, larger rig, it's an old Hobie-14 mast with about 10" cut off.
     
  13. upchurchmr
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    upchurchmr Senior Member

    A Hobie 14 rig is only 22' 3".

    Cutting 10' off leaves you very little.
     
  14. Doug Halsey
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    Doug Halsey Senior Member

    I cut off ~10 inches, not 10 feet.

    Cutting off 10' would have been pretty extreme:)
     

  15. rcnesneg
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    rcnesneg Senior Member

    Thanks Doug!

    I was wondering about the mast height. The hydroptere prototype mast is 31 feet... I bought a 22 foot mast (wing shape, top is tapered) and I was thinking it's too small but I feel a lot better knowing broomstick has one about that long too.
     
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