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#1
07-03-2008
 MarkTilley Junior Member Join Date: Jul 2008 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 0
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)?

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#2
07-03-2008
 sailingdog Telstar 28 Join Date: Mar 2006 Location: New England Posts: 43,290 Thanks: 0 Thanked 14 Times in 12 Posts Rep Power: 14
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.
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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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#3
07-04-2008
 Valiente Senior Member Join Date: Jun 2006 Location: Toronto Posts: 5,491 Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 10
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.

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