have you ever seen an umbrella turn inside out with a strong wind......dont push your luck eh!

coro fuse is a good idea. you will not get it right on first time and it will have to take knocks.
throttle up and the fuse will move forward pulling the brolly with it, i have decided to make one aswell!
i would have thought the c/g would be about 1/3rd way back from the brolly leading edge( ? )

good luck, get building!