Here is where I got the formula on the Harken site. About 2/3 down the
page:
http://www.harken.com/winches/wnchpower.php

It is also in Brion Toss's Riggers Apprentice on page 42. (Almost
verbatim from the harken site.) OTOH, when you look at the tables a 56
or 64 is the recommended size for a 500 sq ft foretriangle.

I wish to heck I knew what a Newton is. All the really authoritative
modern texts are metric!



--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com