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stan
Deckhand

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USA
21 Posts
Initially Posted - 05/04/2005 :  19:55:41  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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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 05/04/2005 :  21:45:26  Show Profile
You mean for establishing a (semi)-permanent mooring ?

(That's the only thing I've seen mushroom anchors used for on any boat larger than a rowboat)
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ilnadi
Captain

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452 Posts
Response Posted - 05/04/2005 :  22:56:41  Show Profile
Well, depends on the size of the mushroom
from the US Lighthouse Society (http://www.uslhs.org/index.html)
"<i>One unique attribute of lightships is the large mushroom anchor (weighing 6,500 lbs.), which extends out from the bow. This anchor allowed the vessels to maintain their station in all states of weather, even when other vessels sought safe haven during gales or hurricanes.</i>"
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sweetcraft
Admiral

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USA
816 Posts
Response Posted - 05/04/2005 :  23:14:12  Show Profile
I used an oil drum full of concrete for my 79 SK with a 20' 3/8ths inch chain only because our club had a float with a winch that could lift it and move it. Our lake could blow up a summer wave that cause the drum to be pulled over from a standing position. Later with a lot of experience we started using drier drums full of concrete with a galvanized eye in the center top. We could roll it with the chain attached down the ramp and our boats with the jib winch could lift it with hull protection (carpet) and place it out in the lake. This size worked in really tough weather. The float was designed like thoses used in the Northwest, a tire mounted wheel with a pipe sleeve welded in the center. They were painted white with a blue stripe and the boat name on the top edge. Some of us designed a swivel on top that would follow the boat around and the mooring lines did not twist nor did the chain to the drum. Hope this helps with our experiences. The chains lasted for five years as our lake is a desert lake which is alkaline. They were checked at the start of each season.
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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.