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post #171 of Old 08-15-2012
Maine Sail
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Re: Let's talk about anchors some more

Quote:
Originally Posted by Minnewaska View Post
Minor correction, but it can make a difference in shallow water. If you anchor in 10 feet of water with a 4 foot freeboard, you put out 98 feet, not 70. Or said differently, if you only put 70 feet out, you only have a roughly 5 to 1 scope.
Now imagine not adding bow height and anchoring and setting scope for 10' but also forgetting to add a 12' Maine tide.... Seen it a few times, often not pretty when the wind blows...

That 70' of scope you thought had you at 7:1 now needs to be 182' for 7:1 and you're now really at 2.7:1 scope when the tide comes in. Less than 3:1 is a long way from the 7:1 you thought you had..

It would be even worse if you initially set for 5:1..

10' @ 5:1 = 50' (forgetting g bow and tide height)

26' to bow chock at high tide = 1.9:1 scope from what you thought was 5:1....

Watched a guy on a remote Maine island lift his anchor right out of the bottom and his boat just drifted away. As the water got deeper his anchor was not even touching the bottom. I tried to save it in my dinghy but did not have the power into the wind. Luckily a lobsterman came along and we towed it back. My guess is he set for 2:1 at MLW then went for a hike on the island and never accounted for the bow height or the 12' tide that day.....

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-Maine Sail / CS-36T


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