Randy:
What is the upper limit of plane size (competitive pattern ship) that you would recommend for your PA 40 UL ?
Wing span and area wise..
What is total weight of engine, pipe & header package ?
HI Allan
The motor would pull an Impact as well as any OS VF does, it will turn the exact same prop faster in a 4 cycle, however the almost 4 ounce differance in weight might upset the balance of a plane that large
People are already using the engine in 700 plus sq in ships, USA-1 and Super Ares are pulled easy by it.
I however would use it in a 510 to 640 size airplane. It work very well in most all Classic ships. Do you have a specific plane in mind?
Randy