I had an OS FX .91 in mine when it started life, but I had so much trouble with that engine (outlined elsewhere) that I bought the Saito.

It IS a great, stable flier, and I'm getting it dialed in to the point that I can hover it for longer periods of time, but like you Dave, it is practically impossible to do a waterfall! I have tried mixing elevator and flaperons to kick it over sharper, but it just won't tumble. It might be it's long moment preventing it.

Anyway, great fun and lots of flights with this plane. I still despise the covering, but it might be a good winter project to recover it with MonoKote.

Take care,

Dave