I'm going to run a OS.61 on a TF Piper Arrow that I built. Some thoughts were that engine is underpowered for that plane. In your opinion can you use a different size prop to make up for an engine that may be underpowered for a plane? I oringinally had a 11x5 prop but after reading through this thread that may be way to small both in pitch and dia. Tell me what you think as well.
Thanks

chopper