> I've been pondering for a quite awhile whether one can knife
> edge a Robin 2160... the main thing that has been on my mind
> has been the ventral fin. It's a rather flimsy affair (as I
> remember, a hollow composite skin, possibly riveted on, and
> has no internal rigidity).
I thought these sort of things were added to prevent spin/aid spin recovery? Would they get a lot more loading in that situation than in knife edge?