I am finishing up my Avistar now. I am using an OS 46AX engine. What would be a good prop size to start with? I have an 11x4 and a 10x7 in my box now. Would it be ok to run in the engine with the 11x4 or a 10x4? I want somthing that will keep the speed down but have a lot of thrust. Also would wood or the Master Airscrew props be better? Thanks