alternative scope formula - SailNet Community
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alternative scope formula

A few (4-6) years ago there was an article in one of the sailing magazines suggesting a scope formula that used a constant plus a multiple of depth be used rather than just a direct multiple of depth (e.g. 100' + 3 x depth vs. 7 x depth), unfortunately I can't remember the formula and I can't find the article in my back issues.

I've search this site and read Alain Fraysse's stuff but what I'm looking for is much simpler.

Does anybody remember seeing that article (or remember the values it used)?

Mark Tilley
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Old 07-03-2008
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I've never heard of a scope calculation formula that wasn't based on the depth of water at high tide + distance to the bow roller. It wouldn't make sense in most cases, since it would leave you anchored at relatively short scope in deeper waters, and leave you with an excessively large swinging circle in shallower waters, depending on what the constant and the multiplier were.

Sailingdog

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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.

—Cpt. Mal Reynolds, Serenity (edited)

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Old 07-04-2008
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The only time short scope seems appropriate to me is when you are anchoring off a ledge which may be at 10-15 feet and you are being blown directly off it over far deeper water. But even there the tidal stream and swell conditions could argue for a different approach.

In anchoring, the short cuts are really few and far between, I think.
Valiente is offline

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