This is something about my hobby to see things fly on the sky. I have seen many people fly their rc planes or helicopters and thought it was very cool and thrilled sometimes when they performed a 3D fly – loops, rolls, flips – with their heli above the ground for a few meters. I also bought one 4ch heli to play long time ago but found it very hard to control because it always drifts. Later, I realized that it has only one gyro sensor to compensate for the yaw motion, no control on the roll and pitch. Moreover, the heli I bought was the 4 channel one, so again, there is no way to manually adjust the roll motion. Then I found the multicopter is quite interesting, simple to build so I made up my mind to build one.