I had a TT pro 46 in my trainer and I used a evolution 10x6. It was a pretty good screamer with that prop on 15% nitro, but in my opinion, it was a great combo. Mine would roll 20 and take off at a really steep angle at full throttle. If I left it on the ground to build speed it would go striaght up much farther than a trainer should be able to! On landing it it slowed down enough to make it managable on apporach. I tried a 11x4 and 11x5 on it as well and it slowed the plane down quite a bit in flight and helped slow the plane even more on approach. I just didnt like the lack of top speed with the lower pitch prop. Again it is my opinion but I really liked the 10x6 evolution for this engine on a 40 size trainer. Good luck!