Longshot trifoiler

Discussion in 'Sailboats' started by bcv99, May 8, 2007.

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  1. bcv99
    Joined: May 2007
    Posts: 11
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    Location: Germany

    bcv99 Junior Member

    New speed sailing crafts

    Seems like there are some new designs aiming speed sailing record based on hydrofoils, like e.g. Sylphe, Absolute Wind Records and Project Dared. Information can be found here.

    Absolute Wind Records, Project Dared (scroll down):
    http://foils.wordpress.com/

    Projekt Sylphe:
    http://www.ecole-navale.fr/fr/irenav/groupes/hydrodynamique/publications/workshop_voile/PDF-2004/A4Sylphe.pdf

    These approaches are probably inspired by the recent success of Hydroptere.

    Does anyone have some more information on those very interesting projects? What do you think of the approaches? Is the hydrofoil development (the latest research work seems to be focused in France) so far progressed that a new attempt for the absolute speed record is possible? Will they use supercavitating foils? Or maybe swept supcavitation one?

    Really curious what you think about that!

    cheers, Bernd
     
    bcv99, Jul 16, 2007
    #16
  2. tspeer
    Joined: Feb 2002
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    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    I'm really surprised that none of the foilers seem to recognize the need for sweep. It could significantly extend the range of subcavitating operation.
     
    tspeer, Jul 21, 2007
    #17
  3. Doug Lord

    Doug Lord Guest

    Doug Lord, Jul 21, 2007
    #18
  4. tspeer
    Joined: Feb 2002
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    Likes: 303, Points: 83, Legacy Rep: 1673
    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    Yes, but with more taper and a higher aspect ratio.
     
    tspeer, Jul 21, 2007
    #19
  5. TTS
    Joined: Jul 2007
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    Location: New Hampshire

    TTS Senior Member

    Doug,

    What I can add to this is that Jay took possession of a modified and rebuilt Waterat A-Class from me on 7-13-2007 for use in this project. Conceptually it is an interesting approach, but I think it will take some time to work out the inherent bugs in the design and approach. One of the issues that will come up is probably a hobby horsing effect with forward and rear airfoils competing against each other for stability. Beyond that I can not say more, but those interested in the project or who think they might want to assist him can reach him at is email XYPTX@aol.com

    Tom
     
    TTS, Jul 23, 2007
    #20

  7. Doug Lord

    Doug Lord Guest

    Thanks, Tom!
     
    Doug Lord, Jul 23, 2007
    #21
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