Great Multihull Video

Discussion in 'Multihulls' started by Doug Lord, Jan 26, 2010.

  1. HASYB
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    HASYB Senior Member

  2. Doug Lord
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  3. Corley
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    Corley epoxy coated

    A video from the Extreme 40 sailing season. Quite a good race I thought noticed over on crew.org.nz

     
  4. HASYB
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  5. Doug Lord
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    Doug Lord Flight Ready

    Thanks, Hielan!
     
  6. Corley
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  7. Doug Lord
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    =====================
    Thanks-I noticed "le diagonal foils". The boat doesn't appear to have a main daggerboard? I didn't search thoroughly though...
     
  8. Silver Raven
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    Foils wet & dry

    Gooday - I notice that the main-sail has very few battens ??? Makes me wonder ???

    For sure - I don't see a main hull c/b either ! ! !

    I notice the the 'float' foils are - a long way forward ???

    I also seem to see - that the 'float' foil tips have the max cord a long way back & don't seem all that thin at the trailing edge either ???

    Wonder how much they know - that we don't ???

    Greed me - would like some of their budget - to play experiments ! ! ! !

    'Smik-o' looking 'rocket' though. Anyone got a spare $2 mil just to start ???

    Ciao, james
     
  9. Corley
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    I dont think you can draw many conclusions the boat was built in 1988 and is the (old by race boats standards) elf aquitaine ORMA60 trimaran. As Doug has pointed out in other threads ORMA was very much a development class so the boats evolved radically over the years. The curved boards replaced angled float foils when ORMA60 platforms went square and they had to fit the foils within the beam limit. I agree, it's interesting I cant see a daggerboard either it may be in a half height case inside the boat but theres no evidence I can see from the photos of a daggerboard slot in the deck.
     
  10. Corley
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    Whats not to like about groupama2? That boat just hauls and fast! I cant see the video in the thread but correct me if I'm blind.

     
  11. Silver Raven
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    Gooday Corley - - I went into 'google' - got the video up - full screen (& that for me is 540 mm x millions of pixels (medical analysis level) & BP 3 sure has a lot of WOW factor.

    Suppose you want us all to keep buying lots of lotto tickets - so you might get one of those to replace your 40' Hughes - eh ??? What a grand idea ! ! !

    It sure is one heck of a 'flying machine' - golly gosh - bungy seat-belts - so you don't go over the back of the boat. Ooops when up-side-down though. Thanks for posting so much serious 'boat ****' - keep it coming eh. Ciao, jj
     
  12. Silver Raven
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    Gooday Corley - - I went into 'google' - got the video up - full screen (& that for me is 540 mm x millions of pixels (medical analysis level) & Groupama 2 sure has a lot of WOW factor.

    Suppose you want us all to keep buying lots of lotto tickets - so you might get one of those to replace your 40' Hughes - eh ??? What a grand idea ! ! !

    It sure is one heck of a 'flying machine' - golly gosh - bungy seat-belts - so you don't go over the back of the boat. Ooops when up-side-down though. Thanks for posting so much serious 'boat ****' - keep it coming eh. Ciao, jj
     
  13. Gary Baigent
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    Gary Baigent Senior Member

    Corley is on the money about the old Elf Aquitaine tri, designed by (predominately) cat designer and Muliplast builder Gilles Ollier - and that is why this renamed version has the high buoyancy floats (like a cat) and flat tubular beams (I think originally they were alloy), also, like a cat, this tri had vertical daggerboards in the floats and no central main hull board. The new curved foils may have been shifted forward.
     
  14. HASYB
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    Well, I like it a lot but having watched the video a couple of times I just keep thinking that boat wants and can go faster (IMHO) but is restricted in speed by:
    to much foil?,
    a ventilating foil?,
    lacking a foil on the stern?
    a balance/weight thing?
    BP5, if there is any comparison possible, looks at speed much more balanced
    http://www.youtube.com/watch?v=AP985PjMGts
    A pity they don't show the recovery of BP5 after they dump the jib.
    Just armchair musing.

    What do you think?
     

  15. Corley
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    Well Groupama2 won the last 5 ORMA championships and was easily the best ORMA of it's generation they prevailed against some strong competition so they must have arrived at a pretty good solution. The boat trims towards the rear which appears to be the prefered method when running foil assistance. It keeps the bows out and the boat resting on the rear full transoms with the bows providing plenty of reserve buoyancy. BP5 has over twice the waterline length to utilise, ORMA restricted boat length to 60' overall so you would expect the rearwards trim to be more noticeable with the shorter LOA. If I recall correctly some of the ORMA teams did try rudder or additional rear T foils but they were not a success.
     
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