MultiCopter
A multi copter is a mechanically simple aerial vehicle whose motion is controlled by speeding or slowing multiple downward thrusting motor/propeller units.
This is a quadcopter is the simplest type of multi copter, with each motor/propeller spinning in the opposite direction from the two motors on either side of it (i.e. motors on opposite corners of the frame spin in the same direction).
A quadcopter can control its roll and pitch rotation by speeding up two motors on one side and slowing down the other two.
The copter can turn left or right by speeding up two motors that are diagonally across from each other, and slowing down the other two.
Horizontal motion is accomplished by temporarily speeding up/slowing down some motors so that the vehicle is leaning in the direction of desired travel and increasing the overall thrust of all motors so the vehicle shoots forward. Generally the more the vehicle leans, the faster it travels.
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