RE: OS 1.60 for a 2x2
My flying buddies use to use the OS 160, the only thing is it is an on/off engine, no torque below half throttle, so you need full power for pretty much all verticals, and if the maneuver is huge it might lack power, it also depends on the airframe, they used on a Camodel Eclipse and Epsilon. Prop APC 16x13 and 17x12 if I remember correctly.
Best regards
Alejandro P.