RE: O.S 120 AX cooling question
We have no advice. Anything that will provide cooling air to your engine is good. Usually, making baffles in the cowling will do the job nicely without having gargantuan holes in the cowling. Adding another motor and fan setup will take up valuable space and add weight, but you can certainly try it. Just make sure the cooling air actually passes THROUGH the fins of the cylinder and cylinder head.