I need to break in my new .55AX, and I will probably do so on my Alpha 40.

I agree that the Super Tigre 45 probably won't be a big performance increase - but it sure will sound a lot faster . I have one on a Bel Air 40 bipe, and it is a very powerful engine. It just might not be the upgrade you a looking for.

I really liked the looks of that Alpha with the flat wing. I may try that some day.

And I never fly mine without at least 14 rubber bands.

Good luck