hi i was flying my trainer with an 11x6 graupner prop and after having crashed it and rebuilt it im nearly ready to maiden her again!!.ive read lots of things about prop sizes and now im wondering if this prop was the right size?,would i be better with an 11x5 or a 10x6 or something else?.anyone know which would give me the best prerformance?.im taking off a grass runway and sometimes she takes a long time to get airborn would a 10x5 give me more speed on take off?.