Hybrid wing sail-used by Randy Smyth to win Everglades Challenge

Discussion in 'Multihulls' started by Doug Lord, Nov 28, 2017.

  1. Doug Lord
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    Doug Lord Flight Ready

    If you can get access to Professional Boatbuilder, the article by Jim Brown is in the latest issue-Number 170,December/January,
    p49-59.Haven't read the whole thing yet but it is pretty detailed. The rig is being used on the 40' Caliente and will be used on a new 53' cat called Eagle designed by Paul Bieker/Eric Jolley.
    There is a large foiler being developed to use the rig as well.
    The Wing is now patented with several additional patents pending and Fast Forward Composites in Bristol, Rhode Island is now licencing the Wing.

    The Wing, reefed:
    Scizzor 2017.jpg

    The Wing-soft sail removed:
    Scissor 2017.jpg
     
    Cholsson likes this.
  2. ThomD
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    ThomD Senior Member

    Structural differences aside what is the major way in which this is a different concept from any wingspar/sail which splits lift between a spar and a sail?
     
  3. David Cooper
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    David Cooper Senior Member

    The key difference is that the wing can rotate 360 degrees without running into the shrouds (which is why the top part is so narrow and sharp pointed) - in a gale, the rear part of the sail can be lowered and the wing part can be let go at any time to point wherever the wind takes it, completely depowering it.
     
  4. brian eiland
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    brian eiland Senior Member

    This really is a game changing rig design. Congratulations Randy

    I only discovered this a week ago
     
  5. DCockey
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    DCockey Senior Member

  6. brian eiland
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    brian eiland Senior Member

  7. Slingshot
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    Slingshot Junior Member

    Does anybody know what foil profile is used for the hybrid wing or the AC50 wing for that matter. Is it a NACA series?
     
  8. Gary Baigent
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    Gary Baigent Senior Member

    Looks very skinny on Sizzor, guessing 9% chord, maybe even less.
     
  9. Slingshot
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    Slingshot Junior Member

    like a Naca 0009. Is the 63 series any better when symmetrical?
     
  10. Gary Baigent
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    Gary Baigent Senior Member

    Looked again, more likely 10 maybe even 12%, ask Randy, I'm just guessing. Also you're dealing with a slightly flexible foil cross section shape in a sail, not the same as a solid carbon lifting foil.
     
  11. BlueBell
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    BlueBell Ahhhhh...

    9% max
    NACA0009 is okay but there are others that allow for higher speed.
    Dr T Speer would have something to say here if he's watching.
     
  12. DCockey
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    DCockey Senior Member

    Airfoil shape does not "allow for higher speed". Airfoil shape influences the drag vs lift characteristics and maximum lift which can be obtained.

    At transonic speeds (speeds approaching the speed of sound with local speed exceeding Mach 1) the Mach number at which the drag starts to rise due to the presence of shock waves is affected by airfoil shape but boats do not go anywhere close to transonic speeds.
     
  13. BlueBell
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    BlueBell Ahhhhh...

    Yes, less drag for given lift, therefore higher speed.
    You are either completely clueless or you misunderstood my post.
    Either way, I'm not going to argue with you.
     

  14. brian eiland
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    brian eiland Senior Member

    Several things that impressed me about this rig...
    1) Previous fully rotating rigs have required unstayed 'free standing' masts with generous sectional dimensions. Because this hybrid wing's D-spar is already fat, its adaptable for freestanding applications,...already. The athwartships D flat eliminates the need for spreaders.

    2) "compared to my regular rig for Sizzor, the wing has only a fraction of the sheet load. That's why I was able to trim so quickly in those gusts", Randy Smyth
    'the wing exerts about 40% less load at the mainsheet,...the old rig needed a seven-part purchase, but the wing requires only a four-part tackle'.

    3) 'one test was conducted recently by capsizing the 40' Caliente. The wing's buoyancy arrested the capsize at the knockdown position, preventing the boat from turning turtle. The experience suggest the potential for developing wing-equipped self rescuing multihulls.'

    Quotes from this article in Professional Boatbuilder
    Professional BoatBuilder - 170 - Dec-Jan 2018 https://pbbackissues.advanced-pub.com/?issueID=170&pageID=58
     
    Last edited: Apr 12, 2020
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