I built a Greatplanes P-51 and mounted a Saito 72 inverted and it just flew awesome. It is still flying fantastic. This plane was built for a friend and it is one of his favorites. It will hydro lock if you are not careful. It's just one of those things you have to get used to . He knows how to start the engine and very seldom gets hydro lock anymore. I highly recommend it....... as it is the only way to get some planes to look just right.