Loose foot allows
for easier, more uniform sail shape throughout the range. I just switched sails after six years and went that rout. I did stick with just the top 2 battens being full length, but all battons are tapered now. I went with UK's pentex and tapedrive to minimize stretch. With traditional dacron, full battons all the way down would probable reduce the stretch problem.I do note that I'm now about even with the S2's with oversized mains that last year were pulling away from me. I'll be sharing info on my articulated bow sprit (version 4) shortly.