Homebuilt small Foiler well executed

Discussion in 'Boat Design' started by rwatson, May 6, 2019.

  1. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    Just watched this very cleverly done small boat fitted with Hydrofoils, getting around 32 kph on a 5 HP motor.
    It seems this guy was a former pilot. The workmanship shows a really professional approach.

     
    Dolfiman, Doug Lord and Dejay like this.
  2. Dejay
    Joined: Mar 2018
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    Location: Europe

    Dejay Senior Newbie

    That's amazing. Also probably the best hydrofoiling video ever recorded :D
     
    rwatson likes this.
  3. Squidly-Diddly
    Joined: Sep 2007
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    Location: SF bay

    Squidly-Diddly Senior Member

    interesting that he uses foils for steering and roll control. be nice to have some video from a distance of this in addition to "selfie" shots.
     
  4. sharpii2
    Joined: May 2004
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    Location: Michigan, USA

    sharpii2 Senior Member

    He should get impressive range for his speed. I calculate 40 to 50 mpg. The real number might be even higher.
     
  5. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    I am a sucker for technical books.
    Following up on that small Foiling Boat, I found this source of "how to build a foiler", and bought the book from Amazon.
    This guy has a unique sales pitch, telling you not to buy his book.

    For goodness sake, someone talk me out of building a small foiling power boat, please !

     
  6. Dejay
    Joined: Mar 2018
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    Location: Europe

    Dejay Senior Newbie

    Ok, that's easy. THE BOOK EXCLUSIVELY USES THE IMPERIAL SYSTEM!!! ;)

    The other thing that annoys me about the book is the lack of tables or appendix for foil shapes and lift / drag / reynolds values.
     
  7. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    Damn. Is there a better book than this that you have seen ? :-(
     
  8. Dejay
    Joined: Mar 2018
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    Location: Europe

    Dejay Senior Newbie

    The book is good otherwise! It's just an annoyance. I thought we were being ironic here :D

    There is "Hydrodynamics of High-Speed Marine Vehicles - Odd M. Maltinsens" with a chapter on hydrofoils, but it also doesn't have tables and the ray velinga book is more accessible. I haven't finished reading either yet.

    I don't quite understand the difference between the theory in the book and theoretically achievable values for lift and drag and real life values. It all seems too good to be true if you start to play around with javafoil (or x-foil)
     
  9. sharpii2
    Joined: May 2004
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    Location: Michigan, USA

    sharpii2 Senior Member

    OK. I'll try. Build a large one.
     
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  10. upchurchmr
    Joined: Feb 2011
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    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    Nice find.
    Nothing really new, but seems to be well done.
    And well integrated together.

    I'd like to see you do one, Watson.
     
  11. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    ------
    I think it is, without a doubt, the best book on designing and building small power foilers and it has some good stuff on the Moth. It thoroughly covers the basics. There is not another book that I've found that even comes close!

    PS-----Build the boat!! But you'd enjoy it more if it had sails.........
     
  12. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    =====================
    It seems to me that you don't have to design a new foil from scratch when there are perfectly acceptable foil sections already available like the H105 and the 63412.
     
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  13. Dejay
    Joined: Mar 2018
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    Location: Europe

    Dejay Senior Newbie

    Thanks Doug. Seems I have found my problem, I looked up the 63412 and when I put it into JavaFoil I seem to get way too high values compared to airfoiltools. Must be a bug in JavaFoil since I never make mistakes ;)
     
  14. messabout
    Joined: Jan 2006
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    Location: Lakeland Fl USA

    messabout Senior Member

    this appears to be the same person as the one in the OPs link. This time it's a canoe.
     

  15. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    That was about two years earlier from what I could tell.
    I don't know that I could stick some bolts into such a pristine timber canoe. Maybe that's why he built the later boat.
     
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