Great little airplane but not a trainer. Mine took a brass spinner nut to balance with a Saito 30. I built it per plans and had no problems with anything except the gear. After I broke the blocks out on a hard landing I fixed it by continueing the structural load path forward to the leading edge. This took care of it proven by several flights with some rough landings. I also wasn't real fond of how they did the compound curved turtle deck. It does cute loops, barrel rolls, stall turns and inverted flight.