RE: Os 91fx enough for a Funtana 90?
Smokey
The Funtana that I have now was formerly powered by an OS 91fx. The guy I bought it from could hover it just fine. He was running an APC 16-4W. I am running a YS 91AC in it now and it is unlimited vertical with the same prop. Hovers at 1/3 throttle. I think the previous owner said it would hover at 1/2 with the OS on 30% heli fuel.
Rich