Yes Rolf, Bethwaite's book is excellent, and he is (or was) also a competition glider pilot, he mentions that there are very many similarites between wings and sails. I'm still trying to figure out how to build a "soft" (collapsable) hard wing type sail. Maybe with inflateable battens or something? Like the C class cats but with kevlar and mylar instead of a hard wing.
Last edited by Timbo; 08/04/06 08:37 PM.