that is a very nice link...but there are no details on all the concepts...
It is very interesting, just curious why is not being used anymore...I know that the AA record sail was also a prototype but not sure if it was a wing sail or some asymmetric profile.
I understand though that the development is not that cheap and that getting the money back is nearly impossible.
Post more...it is an inrteresting reading!
PA 86 & eVo 100 (with S-1); iS 101 & 122 & 144 (with Overdrive)