RCnuter, Go with the 4 stroke, the 2 stroke doesn't have the tork necessary for hovers. the Saito 82 has the best power to weight ratio, but for unlimited verticle in a 46 you may want to consider the OS 91. you may run out of aileron though due to high torque. Kevin, trim to level flight then put it into a knife edge and see which way she goes, (to the belly or the canopy.) if it goes to the canopy, you are nose heavy, if it goes to the belly, you are tail heavy. in knife edge flight you should be able to hold it with little or no elevator. make sure your incidence is correct before adjusting center of gravity.

T-Man