I have tried this several times with my 85" Yak. I can't get it! I get a couple of rotations (if I am lucky) in the knife edge spin and it drops right into an inverted flat spin.

Too much power? Not enough power? Too much elevator? Once it gets into the spin I'm staying off of the ailerons. *shrug* On sims I can do this manuever with 3 different entries and transitions into other manuevers but get a real plane up and I botch it every time.