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post #10 of Old 08-04-2006
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Originally Posted by solent
Reading theses posts explain why at some achorages yachts are swinging into the position of other yachts. There is a certain amount of rode required depending on the depth of water. The anchor is not what holds the boat, it is the water pressure pressing down on the surface of the rope as the boat pulls on it.
This answer is so wrong in so many ways.... Actually the water pressure has nothing to do with it... Water pressure on the rode is effectively neutral, as almost as much water is pushing down on the water as is pushing up on the water. There is some buoyancy, which works against the rode sinking, but with an all-chain rode, this is minimal, with an all-rope chain it is still not really a factor. You might want check your facts before posting again.

The scope is what determines what angle the rode will pull at. With an all chain rode, the scope can be shorter, as the weight of the chain will cause it to hang in a catenary curve, and the part of the chain near the anchor will be close to parallel with the bottom. With a combination rode or an all-rope rode, the scope has to be greater, as the line does not have the weight to hang in a catenary curve, against the tension caused by the boat, which is being pushed by the current and/or wind. The closer to parallel that the rode pulls on the anchor, the less likely the anchor is to pull free as a general rule.

The anchor, and in the case of an all-chain rode, the weight of the rode, are what hold the the anchor and rode against the bottom initially, but are not what hold the boat in position. Most anchors do not depend on the weight of the anchor as the sole factor providing the holding power. Spade, plow, fluke, and next generation anchors, like the Rocna, Buegel, and Bulwagga, all depend on burying into the holding medium to provide the bulk of the holding power.


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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

óCpt. Mal Reynolds, Serenity (edited)

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Last edited by sailingdog; 08-04-2006 at 10:02 PM.
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