It will not be impossible but difficult to find a pusher prop for that size engine, so getting a 24 inch propeller for that engine will be easy. I do want to caution you that if you don't know anything about gas engines for aircraft, you may want to get someone that is more knowledgable to help out. A simple mistake could land you in the hospital.
ORIGINAL: digger57
Can some one tell me if you fiqure this out from the cockpit or from the front of the plane. I know in a car it is from inside the car. Need to know so I can buy a prop for engine. And we not sure who made it but we think it is 70cc and was already converted. Any help will be great. JIM