Foil Design- Inverted Stacked Tee Foil-High Speed Goal

Discussion in 'Hydrodynamics and Aerodynamics' started by DouglasEagleson, Sep 23, 2016.

  1. DouglasEagleson
    Joined: Nov 2015
    Posts: 79
    Likes: 2, Points: 0, Legacy Rep: -10
    Location: Gaithersburg, MD

    DouglasEagleson Junior Member

    Here is a design concept for extending the speed range of a sailing hydrofoil. It just uses a smaller high speed foil about 2 feet below the low speed foil. As speed goes up the larger foil leaves the water leaving only the lower high speed foil in the water.

    I use my blogspot as a reference because of lack of internet abilities.

    http://douglaseagleson.blogspot.com
     
  2. Doug Halsey
    Joined: Feb 2007
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    Location: California, USA

    Doug Halsey Senior Member



    That's not exactly a new idea. Here's Alexander Graham Bell's version of it over 110 years ago!
     

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  3. tspeer
    Joined: Feb 2002
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    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    Mk 105 minesweeping sled:

    [​IMG]
    [​IMG]
     
  4. Gary Baigent
    Joined: Jul 2005
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    Location: auckland nz

    Gary Baigent Senior Member

    Frog.
     

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  5. DouglasEagleson
    Joined: Nov 2015
    Posts: 79
    Likes: 2, Points: 0, Legacy Rep: -10
    Location: Gaithersburg, MD

    DouglasEagleson Junior Member

    To all commenting on the age of the technology of stacked foils. I did say it is "old technology". I posted it because it did not appear in this forum as a used technology. It is mandatory for altering the top speed of a sailboat on foils.

    It is common knowledge and therefor NOT patentable. But if I can make a change of substantial nature I could get a patent as a derivative of this class of foil design.

    The drag of a single foiler could be altered dynamically by other means such as using aircraft flaps on a water foil. But this is complex machinery. MY patent is just a fine point in foil hydrodynamics giving maybe a few knots of free speed.
     
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