I bought the h9 540 edge, installed the Mokie 210, placed the elevator hinges in the rear. reinforced the landing gear area and the motor mount bulkheads. Do not exceed the throws in the manual for the elevators. On high rate the plane has a very nasty tendecy to snap when doing a loop. and on landing the power has to be on. A friend did the same thing only with a bisson 3.2 gas. It was so eractic that he traded the plane for an unfinished Balsa Nova. After 10 flights, I have had to repair the landing gear 6 times because it snapped on landing. I do not think this is a plane for a new flyer. I am going to get rid of mine because it is to hot for me to handle.