David Flynn

I think what you're asking is if there is a way to build extra layer into the leech of the mainsail to help support additional roach. If this is your question the short answer is not really. Additional material itself is not enough to handle the compression loads generated by additional roach. You need batten structure. Vertical battens are not great in compression either, but, they do help support the extra area and allow for addition of some extra area. They also, however, increase the size of the bundle and represent opportunities for wear and tear and jamming. Unfortunately there is not free lunch when it comes to extra roach and a behind the mast or in mast furling mainsail.