Anchor lifting bouys

Discussion in 'Projects & Proposals' started by valvebounce, Apr 16, 2017.

  1. valvebounce
    Joined: Dec 2010
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    Location: manchester uk

    valvebounce Senior Member

    Haha,I think Gonzo is a technocrat,but a very handy technocrat to know never the less.
     

  2. leaky
    Joined: Sep 2008
    Posts: 107
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    Location: nh

    leaky Senior Member

    Old thread but in practice there is more to it than the weight of the anchor/chain/gear versus buoy, since you have friction and the shape of the anchor involved too. I do this at least 100 times per season in depths 100 to 400 ft.

    Typically what someone sees when pulling an anchor via buoy & ring is at first the buoy remains fairly in place and the anchor/line travels up through the ring, as everything starts to stretch out the buoy and anchor are getting dragged by the boat, now the anchor might be actually be exerting a force well beyond it's weight attempting to dive down to the bottom, while at the same time the ball is being planed to the top, a buoy can get pulled under in some circumstances prior to the anchor reaching the surface.

    In practice for a danforth style anchor that is ~20 lbs with 50 feet of 5/16 chain (50 lbs on the high end of weight), I use a #4 sized ball, which is a 22 inch diameter ball producing 120 lbs of buoyancy.

    Jon
     
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