yes i balanced the aircraft laterally. yet it still rolled to the left..why? i think it has to do with several factors: the prop wash coming back over the fuselage, engine torque, etc..
now what do you do when a combat plane (with only aileron and elevator) rolls to the left? well you add right aileron and hope it recovers. but what does that do? the left aileron goes down and tries to increase the angle of attack of the left wing, and what does that do in a stall? ..makes the stall deepen and yer screwed...unless you have rudder control and can capitalize on the prop wash.
i think that even though i balanced the aircraft laterally, there were still enough differences in it's symmetry to help it roll left.
i have read that the curtiss P-40 warhawk (my combat plane) was a ***** when it came to torque effects. maybe this is a design flaw...damn! i knew i shoulda built a p-51B mustang!