I used a Frame_class-9 for coax copter and built a prototype, everything was fine with ground test but the copter did not takeoff and hover, it always flips over.
I placed the battery in bottom centre and cg is balanced.
If someone has any suggestions or solutions please share.
Could you please share some photos of your design, and, if possible, flight logs and videos?
Myself, I am currently tuning my seventh coax, and I am also helping another person with their coax too, so why not more designs and more data?