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Ha I tried one of them, flap things too, ended up with 500m nylon wraped and twisted up around the thing, the book I got the info from, didn't say FA about not using it if there is a bit of a rip.

I think unless you get perfect conditions, its not going to work, Its as tall as it is wide, think it will end up upside down, if you get any kind side wind or wave or water on one side or the other,...