Using hydrofoil for race kayak stability

Discussion in 'Hydrodynamics and Aerodynamics' started by rallyhybrid, Sep 14, 2018.

  1. BlueBell
    Joined: May 2017
    Posts: 807
    Likes: 88, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    If this idea doesn't give sufficient roll stability, a small flap could be added to the strut, near the bottom.
    Connected to the levelling servo arm for additional roll correction / control.
    This arrangement would act as a canard, like in the WaveBike ( YouTube ).
     
  2. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    BlueBell, I've looked for a "canard" in the video and couldn't find it. What time in the video is it shown?
     
  3. BlueBell
    Joined: May 2017
    Posts: 807
    Likes: 88, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    It's shown throughout but you can't see it, it's in the water silly!
     
  4. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Ah, I see-an invisible canard...makes sense-I just don't see how? Oh, well...
     
  5. BlueBell
    Joined: May 2017
    Posts: 807
    Likes: 88, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Well, what do think is holding the riders up?
     
  6. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Well,if it wasn't the invisible canard then it was probably buoyancy.....
    The whole truth and nothin but the truth, more or less:

     
    Last edited: Sep 27, 2018
  7. Blueknarr
    Joined: Aug 2017
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    Location: Colorado

    Blueknarr Senior Member

    or Photoshop

    The riders don't respond to bounces and the craft doesn't respond to the riders steering.
     
  8. BlueBell
    Joined: May 2017
    Posts: 807
    Likes: 88, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    The handle bars go directly to the canard.
    It has the same balancing affect as riding a bike.
    I spoke with the builder some time ago.
    As you can see, it worked well.
    Photoshop? Did you see how old the video is?
     
  9. johnhazel
    Joined: Jun 2008
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    Location: Michigan

    johnhazel Senior Member

    There's a pragmatic side of roll damping in kayaks. Roll damping slows a capsize. A slower capsize allows the paddler more time to get his blade in the water and brace to prevent a swim. Even a boat that is technically unstable can be kept upright if the roll is damped enough to give the paddler sufficient time to react.
     

  10. Steve Clark
    Joined: Jul 2004
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    Location: Narragansett Bay RI

    Steve Clark Charged Particle

    5E6DD4E6-BB1C-40EB-B1CB-087A25330395.jpeg

    Attached is picture of a foil I have been developing for single sculls.
    It is mounted under one of the riggers, can pivot 360 so it won’t steer the boat.
    Trailing wand adjusts AOA as needed to provide up or down force as needed.
    Having foil on one side only allows for normal handling/ docking of shell.drid
    At 3m/second it provides a bit more than 1 kg force.
    Probably pretty close to what Rallyhybrid envisions.
    I’m seeking IP protection and partners to commercialize it.
    SHC
     
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