My friend just got a Hobbistar select RTF. It didn't come with a prop. Recommended break-in prop for the OS .65LA is a 12x6. I have a spare 11x6. Would this allow the engine to over rev and / or not have enough pitch to properly fly the plane? We would just use it for initial flights and trimming out until we can get to the LHS. I sure don't want to start him out in the wrong direction.