Historical multihulls

Discussion in 'Multihulls' started by Gary Baigent, Feb 26, 2012.

  1. Skip JayR
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    Skip JayR Tri Enthusiast

    VPP for Formula 40...

    Interesting... I didnt know about that in the 80ths they used computer aided velocity prediction programs (VPP) *) for Formula 40 boats.

    I think the programmes in the market, e.g. French programme WinDesign or AeroHydro's AHVPP started 25 years ago or TechSail'sSailfish Yacht Analyzer came lately 2000 into the market.

    At least you can tell which two Formula 40 Cats/Trimarans had been tested... :) And: Was the test series part of an America's Cup campaign ?
    _________________________

    *) The first VPP was developed at the Massachusetts Institute of Technology during the early 1970s when Commodore H. Irving Pratt funded research to predict the performance "of a sailing yacht, given knowledge of its hull, rig and sailplan geometry".
     
  2. Gary Baigent
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    Gary Baigent Senior Member

    A B24 I doubt is faster than the 28 or 33 - but it is certainly a high end performance design for its time, and its size and even today. We altered B24 Miranda, angled float foils, no main hull dagger, longer stern floats - but very pointed, lengthened main hull in stern sections, reduced the rocker, (most important) new rudder, rotating small foil mast, changed rig to 7/8ths - so it was definitely a more performance version than stock - also was kept light (but haven't got figures), floated high.
    That boat has sailed many miles and the only time we ever looked to be getting into trouble was when close reaching two handed with shy spinnaker, the halyard jammer let go and the kite flew out to leeard but remained sheeted ... so the boat reared up, buried lee float, lifted main hull out until sheet was eased and halyard cranked back in. I thought we had reached the point of no return but really, although we pulled the right strings, the B24 saved its own self. Buoyant floats, light weight and lifting angled foil would also have contributed.
    Check out the clean wake.
     

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  3. Skip JayR
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    Skip JayR Tri Enthusiast

    (Smaller) Alternatives to 97 Foot length...

    Yes, IDEC is a very nice "big boat". Here rarely British and French designers worked together: Nigel Irens & Benoit Cabaret. Regularly they are in concurrence to each other.

    A 97 Footer is huge... highly production costs...

    What do you think about the concept for the smaller Trimaran ANEO sailed by female French skipper Anne Caseneuve...
    [​IMG]

    For me this Trimaran has one of the most harmonic movements going through rough sea... not one of these aggressive "knife cutting through butter" racers.
    https://www.youtube.com/watch?v=Yxi5pSG1HUc


    Interesting that Trimaran ANEO (built in 2001) was combining the design quality of two trimarans: main hull of Fujicolor (60ft.) originally designed by Nigel Irens plus the amas coming from Franck Cammas' Groupama 2 (60ft).


    Would be interesting to know a Trimaran with Schooner rig, indeed...

    Mainly I have seen Ketch rigs... e.g. free standing masts on 55 ft. Juniper 2 (built in 1989) designed by Chris White which just was sold for 200,000 US dollars.

    [​IMG]

    Any Trimarans rigged as schooner ?
     
  4. oldsailor7
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    oldsailor7 Senior Member

    Thats a wonderful picture of a "tweaked" B24. :cool:
    Note how the bows are extended at deck level, and the sterns at water level, giving the benefits of extra float length without excessive increase in weight.
     
  5. Skip JayR
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    Skip JayR Tri Enthusiast

    Cavalier, you cant imagine to cruise on a F40 Trimaran ? :)
     
  6. rogerf
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    rogerf Junior Member

    What is your budget Skip? There is a 40' Cabon tri going for €50K
     
  7. Skip JayR
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    Skip JayR Tri Enthusiast

    Any vid of this pimped boat ? :) Looks from distance beautifully...
     
  8. Skip JayR
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    Skip JayR Tri Enthusiast

    I know, I know, I know... still waiting for some pictures under deck... I am in direct contact with the designer. So lets keep silent for now ! ;-) But I dont have big hope, rogerf. As it is already warned: only for people less taller than 6'. As I have at least 6.07 with shoes I'd get some backbone and neck muscle tensions over time.... not very healthy. :)
     
  9. Skip JayR
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    Skip JayR Tri Enthusiast

    Am I making troubles ??? haha.... thats new. Good to know... its not always bad to be a "trouble shooter". ;-)
     
  10. cavalier mk2
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    cavalier mk2 Senior Member

    Actually I could but it is back pack cruising for sure. And I'd want a smaller rig. The 2 masted option is one also used by that rascal Newick, some of his boats had it as a cruising set up. But then the Nicol is really comfy, dry and embarrasses newer boats and can carry more. Gals like it, it takes care of you.

    One thing to remember in the whole diagonal debacle is that it is much more important on wider boats than narrow ones. The skinny ones carry much more of the down forces on the main bow and stern with the amas getting side loads. The wide lever that comes with big beam demands bows and sterns on the amas that can cope with the loads.

    Right now coast guard choppers are cruising back and forth overhead and I hope someone hasn't gotten into trouble.
     
  11. cavalier mk2
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    cavalier mk2 Senior Member

    I should mention that a couple 35' Nicol Wanderers capsized. They had short floats but went over sideways in big wind, unattention scenarios. The Wanderer then got the longer Vagabond/ Cavalier style amas. The only thing I'd do to mine is similar to the Bucc Gary showed and add a stern ama stem extension instead of the small transoms for less immersed drag.
     
  12. Skip JayR
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    Skip JayR Tri Enthusiast

    There is a thread about the rebuilding of a Nicol Hedley Trimaran...
    http://www.boatdesign.net/forums/multihulls/hedley-nicol-trimaran-plans-31877-18.html#post596093

    [​IMG]

    Some pictures here, too...
    http://trimaranproject.blogspot.de/p/triwanders-hedley-nicol-cavalier.html

    And about the plans...
    http://www.boatdesign.net/forums/multihulls/hedley-nicol-trimaran-plans-31877-6.html
     
  13. Skip JayR
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    Skip JayR Tri Enthusiast

    Nice term.... learnt something new today. :)

    Same old boring story.... luxury girls shall keep home and wait. Luckily there are some out with a healthy brain having understood that comfort isnt eveything in life.

    https://www.youtube.com/watch?v=CkaH_UUH0Ek


    You should look for the right girl in the right place... :)

    You know skipper Karine Fauconnier ?
    [​IMG]

    She was professional skipper till 2010 (then becoming mother at the age of 38), before she skippered a 60 Footer, the Tri Sergio Tacchini (Orma 60)...
    [​IMG]

    ... and sailed the one design D35 Catamaran
    [​IMG]
     

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  14. Doug Halsey
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    Doug Halsey Senior Member

    Norm Riise in California also developed a VPP for predicting catamaran performance at about the same time. I'm not sure when it was 1st operational, but there was an article about it in the April, 1975 issue of Sail magazine. And I have a copy of a letter that Norm wrote in 1972, describing some results from it.
     

  15. Skip JayR
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    Skip JayR Tri Enthusiast

    Tks.... do you know when VPP was used first time for Trimarans ? :)
     
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