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stan
Deckhand

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USA
21 Posts
Initially Posted - 05/04/2005 :  18:18:30  Show Profile
To my fellow boat owners, thank you for your opinions and problem solving acumen.

My question today is : what size mushroom anchor is necessary for a swing keel model?
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cvwall
1st Mate

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USA
56 Posts
Response Posted - 05/05/2005 :  08:27:53  Show Profile
That, like most other anchor questions, depends. if the bottom is mud and the anchorage is protected, 150# with heavy chain should be OK. In a more open anchorage, move up to 250#. Up here, some people use large granite sinkers when the bottom is ledge. These sinkers can weigh several tons. There should be 3-4 X Max depth of heavy chain, with lighter chain to the float, plus a decent length of 5/16" to 3/4" line to the cleats. A lot depends on how tightly the harbormaster packs the mooring grid. Helical mooring systems that are bored into the bottom are the most secure, and are beginning to be required by some harbormasters in storm-prone harbors up here in the NE. Also, I have seen another system of 3 heavy Danforth-type anchors set out at 60 degrees to each other and connected at a central point, from which the chain goes to the float. Do allow for storm surge when calculating the length of the chain; I have seen moorings dragged when the pull from the vessel becomes straight up & down on the mooring and it has been pulled out of the bottom.
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wmkoines
1st Mate

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56 Posts
Response Posted - 05/06/2005 :  15:29:48  Show Profile
I have a 300lb mushroom. I have a fixed keel. Never have had a problem. But I assume that local conditions need to be considered
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.