Ha, speaking of gaff sails
flying, we never used to lash the main gaff down, the sail sat neatly in the lazy jacks, with only a slight tug at the leech to tidy it up.
Anyway we thought the weight of the gaff would hold it down and for many years it did, till one day at anchor
in an exposed roadstead in a gale a big gust must have caught us side on, and it blew the sail, gaff and all most of the way up.
Probably a good thing we had a few reefs
in because she took off like a scalded cat, rail underwater and all, canvas
Scared the crap out of us, all below reading or playing cards. Then with a bang she came up hard on the chain at about five knots or so.. .
The 75lb Danforth copy held, but the shock bent the shank (a regular occurance) and one chain link opened up, amazing it didn't let go over the next day or so.
Anyway, since then we've always at least put a quick tie between the gaff and boom.
Ahh, it's fun talking gaff rig, but it's probably not helping the OP much.