Drone Physics




Image Source: Alaska Adventure Charters




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The Flight Physics of Quadcopter Drones

Physics
The Rotors on the quadcopter drone act like wings. They create lift by rotating at fast speeds, which pulls the air downwards and pushes the quadcopter drone in the air.

If the lift cancels out with the acting force of gravity, then the net force becomes zero and the quad hovers in midair.

A directional thrust makes the quadcopter to move in that direction.

A decrease in lift makes the Drone to lower its height.

Drone Flight Setup:
- Two adjacent motors rotates in the opposite direction.
- Two opposite motors rotates in the same direction.
 
For example, motors 1, 3 rotates Clockwise. While motors 2 and 4 rotate counter-clockwise. The reason behind this is that physics claims to be that the stability of the net force acting on a body should be zero.

Thus, if all the rotors were to rotate in the same direction, the result would be a net Torque causing the complete Quadcopter drone to rotate.




Image Source: Wired

Terminology
The terminology of drone movement is the exactly the same as used when describing naval movement. I will use these terms to explain the motions of our drone.




Image Source: Hackernoon

Roll: Moving to left or right with respect to the front of the drone. (The drone moves side to side.)

Pitch: Moving the drone forward or backwards.

Yaw: Pivoting or turning from the left or right. (The drone rotates around the center.)



Image Source: Quadcopterflyers

 Take Off
In order to take off the ground, you need a net upward Force. The motors generate lift that is greater than the force of gravity, making the drone take off.