A few weeks ago I bought a HK quad PNF kit ( http://www.hobbyking.com/hobbyking/store/__66873__S500_FR4_Glass_Fiber_Quad_Copter_480mm_PNF_Combo.html
) with a turnigy 9x transmitter and some Turnigy nano-tech 2200mah 3s batteries. I replaced the flight controller with a KK2.1.5 and after along time tuning and setting up I'm still having a problem.
When I take off the quad instantly starts drifting to the right quite quickly near impossible to correct if it didn't flip on take off. Can anyone tell me how to fix this the quad seems well balanced in weight and the problem is happening with and without auto-level.
Also are there any better replacement legs I have broken many, ordered more and broke those too.
All help appreciated