paddle wheel

Discussion in 'Propulsion' started by michael smith, May 12, 2019.

  1. michael smith
    Joined: May 2019
    Posts: 9
    Likes: 0, Points: 1
    Location: nova scotia

    michael smith Junior Member

    Hi, I built a 9ft x 2ft punt. Like to use hand powered paddle wheel, 8 blades set at 45d, 7 inches long 5inches wide with 1inch of blade in the water. Any advise? Would be grateful. Hope it's the right forum.
     
  2. BlueBell
    Joined: May 2017
    Posts: 678
    Likes: 64, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Yes, put more than 1 inch of blade in the water.
     
  3. michael smith
    Joined: May 2019
    Posts: 9
    Likes: 0, Points: 1
    Location: nova scotia

    michael smith Junior Member

    hi blue bell thanks
     
  4. michael smith
    Joined: May 2019
    Posts: 9
    Likes: 0, Points: 1
    Location: nova scotia

    michael smith Junior Member

    Hi, wondering would 10 blades be better than 8? Going put 2inch in the water. Should the blades be sandwiched between two wheel cocverings or is blades just attached to one wheel?
     
  5. gonzo
    Joined: Aug 2002
    Posts: 13,347
    Likes: 325, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It is a very narrow punt. The wheel and mechanism to make it turn will likely bring the center of gravity up. You will have a serious lack of stability problem.
     
  6. BlueBell
    Joined: May 2017
    Posts: 678
    Likes: 64, Points: 28
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Not entirely sure what you mean.
    Can you post some pictures and a diagram?
    I see many issues here, stability, as Gonzo says, is one of them.
     

  7. jehardiman
    Joined: Aug 2004
    Posts: 2,405
    Likes: 183, Points: 63, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    I don't think you have it right. For best powering, there should be approximately the same blade area in the water at all times. With the quoted geometry, the next paddle is 1.5 " above the water when the loaded paddle is at maximum depth. So you need to lower the axis of the wheels 1.5". (edit) assuming a non-feathering wheel.
     
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