Waldo, we were extremely pleased (Rick was ecstatic) with the OS .46AX performance on the Twist, 10x7 MAS prop. There was NO trouble with inverted flight , through outside loop, to vertical flight--which was Rick's REASON for changing out the OS .61FX. Though the carb/tank differential with the AX is STILL almost an inch, I had no trouble, almost full tank, getting through that manuever. At nearer an empty tank, it DID flame out, at absolute idle, going inverted, through outside loop, to vertical. But that's asking an awful lot of any engine/airframe combination.

Rick's .46 hovered well and DID pull out of it on demand, but not nearly so fast as the .61/13x4 APC prop combination.

And I'm with Tim about engine size: there has to be an end to it. I wouldn't consider going larger than a .61 on the Twist. What would be the reason? The only time I'm at full throttle with the .61 is when doing inverted spins--and going, when in that spin, from half to full throttle, over and over, produces interesting visual results. I seldom if ever take off at full throttle. Now, the reason for the .61 is obvious: fuel economy, predictable performance, excellent hovers, and power to get me out of trouble when I need it.

Raining here, so it's a fix-up, clean shop day.

Waldo, you see the Super Skybolt is now in an ARF (Tower: $289)? They've only had it in kit form before. I'll have to give up eating for a couple months to be able to afford it, but if it flies ANYTHING like the one they have on RealFlight G3, one of the hottest, aerobatic bipes I've flown on simulator, I want it. I'd put an OS .91 on it--which would mean I'd have to give up drinking, too. Hoo-boy, guess that Skybolt will have to wait.

J