A quadcopter or quadrotor[1] is a type of helicopter with four rotors.[2]

A DJI Phantom quadcopter drone in flight
Typical racing quadcopter with carbon fiber frame and FPV camera

Although quadrotor helicopters and convertiplanes have long been flown experimentally, the configuration remained a curiosity until the arrival of the modern UAV or drone. The small size and low inertia of drones allows use of a particularly simple flight control system, which has greatly increased the practicality of the small quadrotor in this application.

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This article uses material from the Wikipedia article Quadcopter, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.