I've had most of the Cox planes and cars, all of them worked and ran great. They may have not been very stunt-able, but they flew. My favorite flying Cox plane was the Messerschmitt Stunter(I think it was called) foam symmetrical wing, flew real good! I don't remember much about it, it was around 1976! That one would be the only possible R/C conversion that might work, but more trouble that it's worth. Better yet, get an old Cox motor, and one of the Ace Simple series planes, the S400 works great, even though it's designed for electric power,and flies fast too!