RE: TWIST 40 and .61 engine?
I flew a Pizazz, very similar in size/weight with an OS61. I used a 13-5 with good results. It would hover around 2/3rd throttle. I am curious if a 61 2 stroke would turn a 14-4. I Didn't discover the APC 14-4W until I got a Saito .82