I decided to build a basic quadcopter sometime back with the following idea of scale. 1) Build a prototype with basic maneuverability (2 years) 2) Scale it up to carry bigger loads (Year 3) 3) Extend range and add First Person viewer controls so that I can send it out on missions (Year 4) 4) Use a scaled larger model for crop dusting on my farm using GPS co-ordinates and a pre- programmed path (Year 5) I spent a few months reading up and brushing up on aero-modelling, propeller theory, etc and also procuring raw material for the build. I wanted to share my experiences with everyone for two purposes. 1) Help and advice 2) Keep me motivated. The fact that I put this thread up should put enough pressure on me to finish it Some wiki gyan first Quadcopter Schematic of reaction torques on each motor of a quadrotor aircraft, due to spinning rotors. Rotors 1 and 3 spin in one direction, while rotors 2 and 4 spin in the opposite direction, yielding opposing torques for control.