<div>I have an OS 61 FX and found it to be sluggish compared to my Escapade. It will do large loops, and some vertical but stalls out eventually in a vertical climb. I will be putting a OS 95 AX in this plane next week, mostly I will fly it on half throttle and just have the boost for vertical climbing, plus the engine will last longer without having to run it full throttle all the time.</div><div></div><div>TB</div>