I am currently using a Graupner 12.5 X 7 3 blade prop with my YS .63 on a Great Planes Corsair. It was too much prop running on 15% nitro. I am now using 30% heli fuel and the engine is now quite happy with this prop.

I don't notice any significant engine vibration on any of the props I have used on this engine. All of the props have been APCs.