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post #9 of Old 04-01-2006
AlainPOIRAUD
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Quote:
Originally Posted by abstrait
Seems this depends on type of anchor, chain vs rode, conditions, and situation
YES and.. NO..

Any anchor will be the most efficient with an horizontal pullling rode..
which means an infinite lenght..

As soon as the line is shortened.. the efficiency will be reduced:
- to 85% for a 10/1 scope
- to 55% for a 4/1 scope
- etc..
Due to the catenary and the weight of a chain rode, a part of it will be lying horizontaly on the bottoms. When the wind will be building up, the rode will progressively straighten itself, up to the point where the last link of chain will no longer be horizontal and the shank of the anchor will take an angulation to the sea bed, loosing some of its efficiency.

You should always, when possible, adapt the rode lenght in order to keep the last chain link horizontal, which is quite easy to perform, using the right formula ( http://alain.fraysse.free.fr/sail/ro...hesis/synt.htm)
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