Kurt
I fly mine with the OS.91FX and it is a real mover. With the changes OS has made to that engine it is very relieable now. The 14x6 APC prop is quiet but I love the sound you get from the Master Airscrew 14x6 and Bisson Pitts muffler. The plane sounds like a 1/4 scale gasser as it flys buy with that combo. Heads turn at the field. Let me know what you think.