FPV Quadcopters or Quads is an unmanned aerial vehicle (UAV) or drone with four rotors, each with a motor and propeller. A quadcopter can be manually controlled or can be autonomous. It's also called quadrotor helicopter or quadrotor. It belongs to a more general class of aerial vehicles called multicopter or multirotor.

Small quadcopters are easy to build because of low cost, low inertial force and simple flight control system. Quadcopters provide stable flight performance, making them ideal for surveillance and aerial photography. Other application areas include delivery, land surveys, crop assessment, weather broadcasting, and more. Quadcopters exist in many sizes, from palm-sized ones to those that can carry passengers or heavy cargo.

Below List of Categories I found useful for getting my first Quad.

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