how would this affect for instance a hangar 9 j3 piper cub with an SK 50 2 stroke...I broke the engine in realizing that the prop was a 12x6 NOT the recomended 11x6...plane has 2 succesful flights on it with the 12x6 zinger prop...am I hurting the engine ?(am I doing any damage to it with the 12x6 (wood) prop on it)?...it has great torkie-like acceleration and takes off quickly...cruises nicely @ 1/2 throttle...anyhow , getting kinda' long-winded here...would the motor benefit from an 12x5 vs. the 12x6 prop...how would a 11x10 prop behave in my cubby?