Ive got a LT40 ARF with an O.S 46fx on it. Being the beginner in glow that I am, I snapped it on its last flight. I had a 11x6 which is what O.S recommends. Would a 11x5 work ok? I have one and thought "well might as well use it" I can solo so Im at least that far along. Also have a 11x7.5 but I thought that was a little much, or is it?