To do this, he added four servos on each arm of the quad, giving each rotor collective pitch, just like the tail rotor of a real helicopter. The result is a quadcopter that can fly upside-down ...

[Michael] found a very, very cheap toy quadcopter in his local shop ... These bytes contained the throttle, yaw, pitch, roll, and a ‘flip’ settings, along with three bytes of ‘counters ...

The study focuses on a quadcopter drone system ... These sensors measure states such as roll, pitch, yaw, altitude, and speed, and transmit/send them to the controller. Based on user input ...