MM,

What the hell are you even talking about. The 505 carries a bolt footed
main. There is no Shelve. The center curve of the sail can be reduced
by using a Vang to curve the Boom and pull the center section of the
sail flatter. A free footed main does not responded in the center of the
boom bending properly. A increase in bending a boom on a free footed
main will bag the main.

By the way Muffy, did you see the crew on a trapeze fighting heeling?

A very ignorant example for this discussion