An 11-6 is NOT the correct size prop for that engine. It would be just fine for a .46 FX or AX, but it is like throwing an anchor over the side with the LA. If an 11" prop is needed, it can turn an 11-5 acceptably, but not with excessive enthusiasm. It spins an 11-4 with authority.

Martno1fan, the plane will certainly fly with an 11-6, but the engine is dragged well below its torque peak by the prop. You may think that it has plenty of power with the 11-6, but there is noticeably more to be had with a flatter pitch prop.