Paul, I would correct you on the Batten configuration.. When I did the final rebuild of that sail I removed the Tabs that protruded from the Luff of the Sail Body and refitted them Flush with that edge, which in turn lead to the shortening of the Battens and removal of the Cams. The Battens clear the mast when Fully Sheeted, the Tensioners are still used to stretch the sail flat all shape gained from the design of the battens..
What I forgot to discuss on the Forum is that with the Cams in place the Battens became a pain in the Rectum when a turn or change of wind direction dictated the reversal of the foil to be changed. The Cams caused me too much grief..
However something that would be nice to try is and Older Hang Glider Sail halved, the Airfoil should be nearly perfect.. Any ideas??
Ron
PS Sorry US772 for the Hijacking job BUT>>>> There should be some good info' for you for the future.
In that case I buggered if i know how you are managing to get a good shape in the sail.
10 points to ya mate