There is no such thing as stupid question: Just stupind people si the saying go's.

I was big into heli's and I no longer fly heli's however I do fly planes and I have tons of heli engines. Mt question is there any way to convert these engines to ero or is the only difference the head? Idle carb and all the ither stuf similar, I forgot the exhaust mount, I would have to have custom tuned pipes made. With that said any want to swap some heli engines? The engines I have new in the box are

OS PS 91
Westons all sizes
Webras All sizes
YS all sizes
Novarossis 50
os 50 sz hyper
36 os
32 os

Any wat to convert these to plane use, the mufflers would work on an inverted mount.