I built this quad about 3 months ago but was uncertain about doing flips and rolls. RC911 Firmware for the KK2.1 has sorted this out and makes it quite safe to launch the quad knowing it will come back to level. Turnigy Talon V2 Frame cut back to 330. KK2.1 flight controller with RC911 Firmware. AFRO 30A ESCs Turnigy 2830 1000kV Motors 2200 4S Turnigy Lipo 9 x 4.7 Triple Blade Propellers