34th America's Cup: multihulls!

Discussion in 'Multihulls' started by Doug Lord, Sep 13, 2010.

  1. Corley
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    Corley epoxy coated

    The boat seems to trim nicely on it's foils impressive to watch makes you wonder whether they will worry about building another boat or stick with this obviously well developed platform.
     
  2. gypsy28
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    gypsy28 Senior Member

  3. Doug Lord
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    Doug Lord Flight Ready

  4. Doug Lord
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

  5. Doug Lord
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    Doug Lord Flight Ready

    I did this sketch based on the video. Has anyone seen the tip of the inboard portion of the foil yet?

    click on image- I think the picture shows the foil tip-maybe. Click on it,expand it and click on it again to enlarge sufficiently:
     

    Attached Files:

  6. Timothy
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    Timothy Senior Member

    Doug You have taken a lot of flak over the years for your unbridled enthusiasm for lifting foils . I for one am now a believer . It is a revolution.
     
  7. HASYB
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    HASYB Senior Member

    Yeah, look what you done: the whole world want to foil, happy now!
     
  8. Doug Lord
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    Doug Lord Flight Ready

    34th AC on Foils!

    I'm overwhelmed by what TNZ has done with the 72 and to a lesser extent what Oracle has done with the AC 45. I think it will benefit all of sailing, particularly multihulls but monos too as we all learn more. Just incredible stuff!
     
  9. redreuben
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    redreuben redreuben

    You can foil some of the people all of the time, and all of the people some of the time, but you can not foil all of the people all of the time.
     
  10. HASYB
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    HASYB Senior Member

    I'm just amazed how slick, easy, effortlessly it looks.
     
  11. Roger Six
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    Roger Six Surge Protector


    Brilliant! Absolutely brilliant.
     
  12. cavalier mk2
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    cavalier mk2 Senior Member

    It looks most like an endplate, the surface piercing just happens with larger amounts of lift.
     
  13. P Flados
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    P Flados Senior Member

    Doug and other foil nuts,

    A curved dagger foil with L tip matching your sketch could have several different "lift distribution" profiles.

    Choice A: Curved section and straight section (bottom of L) both have positive AOA and produce vertical lift. Due to canting angles, the straight portion provides WRONG direction side force and the curved section must produce enough correct direction side force for both the Wing/sail side force and the foil straight section side force.

    Choice B: Curved section has positive AOA and produces vertical lift. Straight section has negative AOA and pulls down. Due to canting angles, both provide correct direction side force. Sounds like it would be hard to fly both hulls like this unless the straight section is actually pretty close to vertical.

    Choice C: Straight portion is more of an end plate with neutral AOA.

    Choice D: We are all dummies and this thing does somenthing really hard to out guess.
     
  14. cavalier mk2
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    cavalier mk2 Senior Member

    I'll stick with a combination....endplate that performs as such for the curved foil and provides daggerstyle leeway resistance....which is closer to choice C, though I won't put money down till we get better spy sketches.
     

  15. Silver Raven
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    Silver Raven Senior Member

    Gooday Cav. If what you're saying is what Doug drew - then you got it right. If not - then send large amounts of money - for Gary to rent - big hp speed-boat to go out & chase them & take some magnified pics so you can get a better look. Would think s-boat would need to do over 50 kts though.

    Hey chaps - notice the rotation of the wing - WOW - now I'm impressed - that's what I've been waiting to see. Great stuff - fab pics. SUPA 'boad' eh ! ! ! Bit quick for - cruisin' up the inside passage though - would sure get around the island in a hell-of-a-hurry though ! ! ciao, james
     
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