On 2008-08-09 21:06:04 -0400, "Roger Long" said:

The performance difference between the 150%
and the working jib (about a 110% overlap) even in light air and on reaches
was much less than the difference in sail area would indicate.

Upwind, the difference is pretty much the difference in length about a
foot or so behind the luff, where the power comes from. There's some
benefit from less drag in the smaller sail, too.

--
Jere Lull
Xan-à-Deux -- Tanzer 28 #4 out of Tolchester, MD
Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/