ORIGINAL: 150flyer
Built mine last week and have about eight flights so far. I agree the roll rate it super-charged (about four rolls per second on high rate). There is a huge range for the recommended CG. Right now, I am in the middle of the range and the plane handles much better than my original full forward range. I will continue to shift the CG aft until I no longer care for the flight characteristics.
The engine is an OS .75 AX. It has great vertical and pulls out of a hoover easily. I still have a few more flights before I lean the engine for full power but for now I'm extremely happy with this engine for this plane.
The other Reactor in the picture with two is a friends who mounted a Zenoa G20 with a 17 inch prop. It flys a little heavier but has impressive speed and vertical climb-out.
150flyer
I flew an aircraft today with a buddies OS .75 AX and was impressed with the power! I like the way you side mount it with the muffler on the bottom spewing the exhaust "mess" on the underside. I've got an OS .91 four stroke, which (according to a posting here) will bolt (mount + engine) right on this bipe's firewall after removing it from my U-Can-Do, but appreciate the "simplicity" of 2 strokin even tho it's a bit messier.