I had a problem with my OS91FS surpass 1 in my UCDo-46, I would really struggle to maintain an idle and eventually the engine would load up and cut out, made landing with the engine running just about impossible.
Anyways i was going to get a regulator when i decided to try an on-board glow on the beast, now the engine can idle forever without cutting out.
One area i am battling with at the moment is knife edge, I cannot get this plane to hold a decent knife edge without it trying to pull out, are there any tricks to make the KE work