I would seriously hold off on the 4 stroke in a trainer for two reasons:


One you're getting into a lot of money on a motor for a .40 sized engine, when reality is most people want a .60 sized sport plane for #2.....

Two, you're getting into a lot of money on a motor that you're quite likely to break at some point. EVERYONE crashes a trainer, and if it's a good hard nose hit, a cheap two stroke is both more survivable, and cheaply replaced, than the 4 stroke.

Look at the sait 1.00 for a 4* or tiger 60. I maidened mine out yesterday, and it flew beautifully. Pulls off the runway at half throttle, and will fly around at half throttle faster than your trainer will, but puts the brakes on more quickly than my hobbistar ever did(almost stalled it on approach the first time, I wasn't expecting that at all......)