Light gimbal for class 250. Weight is only 126g with Mobius, controller and motors. Based on this project: http://www.msh-tools.com/ardrone/gimbal.html. Motors are http://www.myrcmart.com RCX 1804 2400Kv. The motors are 9 stator / 12 magnet poles. They must be rewound. I used 0.1 mm wire; 120 turns per tooth, both motors. Controller is HMBGC Micro Brushless Gimbal. My H250 slim (http://www.thingiverse.com/thing:890062) with this gimbal and 2200mAh 3S battery weight 695g, flight time about 8min.