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Thanks for the info. I appreciate the physics knowledge applied to quadcopters. That answered my question(s). Due to the masses involved, I see that i may need to use some ancillary yaw control. I don't anticipate adjusting yaw at the same rate as a quadcopter, but a stable and authoritative...

Please read on.. Boeing has sponsored a competition (GoFly) for the private sector for submitting ideas and working full size models for a personal flying machine. Points are awarded for various aspects (size(has to fit in a 8.5' cube), noise, flight time(longer the better), speed, has to fly...

Thank you very much for your explanation. Now suppose i have 4 rotors all spinning at the same speed. Cw in front, ccw in back. Can i use pitch control only to change yaw, pitch, roll etc, assuming that my control system properly translates the motor speed variations into the corresponding...

I appreciate your reply, but it doesn't tell me why it has to be so.... As an engineer, I need to know why....

I just started planning to build a quad rotor as model for an even larger one. In an "X" configuration- each opposing rotor spins in the same direction. Does it matter if the two forward rotors spin CW and the aft rotors spin CCW? Eventually I plan to power the rotors with a single gas engine...