`Can anyone tell me if the older OS FS 70S 4 stroke engine will mount in the Alpha 60 trainer. I have no reason to change out the evolution engine now but I would like to change over to the 4 stroke sometime in the future. 'Also it would be helpful if someone could explain to me how they check their CG ....I understand the physics of doing so ...just wondered if you just pick the plane up in the area of the CG and adjust if necessary or how is this done. Thanks for the help ..


Steve