RE: fixed wing sail
While I think that Dan Kaseler is working on something cutting edge here, I think I have to agree withn Lampi that a 30 foot luff is beyond windsurfing. I could be wrong about this, but the cost margins would most likely exceed pragmatic limits normally associated with windsurfing concepts. Maybe Dan's concepts are more realistic for windsurfing. I've seen this series of photos presented earlier, but it would be interesting to learn more about the later result of Dan's efforts. Some of his earlier prototype concepts were clearly very insightful, particularly the ones replacing carbon battens with inflatible segments. I know that I was impressed with some of his prototype concepts while he was associated with Naish Sails.