Hey mate i would also suggest running a 2 banger on your trainer. Personally im running a LA46 on mine which is about 6 years old and she runs great all the power you would need for a trainer. The question you have to ask is do you want to take this motor out for your next plane? If this is the case i would recomment the 46AX as this engine has some power to play with.'

oh u got it already, nice choices