Stumbled over these and kinda stubbed my toe.
http://www.arvelgentry.com/techs.htm
Sorry evil one, I gave up at the titles. Can you give a quick rundown on what is in the papers?????[}:)]
Spent hours reading through those, good stuff!
Found this one www.onemetre.net/design/Circulat/circulat.htm
that explains the need for static sail twist which is also interesting if you like technical explanations :-)
