I've had one of these. I had a Thunder Tiger .91 4-stroke on mine.

I was flying at 6000' elevation with a 14-6 prop turning about 8500--9000RPM. Can't remember the exact numbers. It's been about 5 yrs.

The plane flies great. I think the .91 is the way to go. The plane flies very similar to the 4*60.

I wish I still had it.

I was flying it at a fun fly event one Sunday at the club. We were doing the limbo. (String some crate paper across the runway and support it on a couple poles. Everyone flies under the paper one time and then the paper gets lowered. Everyone takes a turn again. Lower the paper again. And so on.)

All was well untill my 4th or 5th pass. The paper was about 4' off the runway and I decided to show off and do it inverted.

I got it lined up and was coming down the runway. Full throttle inverted. I was about 6 or 7 feet off the runway when I got over the end of the runway. Plane was sinking very slowly. I just let it sink and it was coming in perfect. I was just starting to push the elevator and level it out when I got about 100' from the paper and was about 2' off the runway.

Unfortunately--I didn't push quite hard enough on the stick.[X(] I pancaked it into the runway right as I crossed under the paper. It tore the cylinder head to kibbles and bits. Cracked the fuse in half--right behind the wing saddle. Basically ruined the plane and the engine. DOH!!

Worst part was that there were about 100 people watching. I still get hassled about that.[&:]

91 4-stroke is a sweat combo for this one.