I just did the maiden flight today on my Twinstar with two Thunder Tiger GP-28 2-strokes. Very, very nice sound!!!!! It flew nicely - well behaved, handles easily, no bad habits. Rolls, loops, and inverted flight are no problem. It lands a little on the fast side. The flight characteristics are good but nothing special. It is exactly what Hobbico says - a twin trainer.

On the third flight I lost an engine shortly after takeoff. I went to full throttle and tried to fly on one engine and correct with rudder but I was low and slow and didn't have good control. So I throttled back and landed off field in some tall grass. No damage.

The GP-28s are plenty of power. Flight time is OK - I'd say 10 minutes with some reserve. I can see that flying a twin will be a learning experience - I will be getting very intimate with these engines.

I expect that mounting four strokes will be tricky. The GP-28s were a snug fit. You may need to cut off the engine compartment cheeks to make room. The throttle linkage may take some creativity.