A quadcopter is a multi-rotor helicopter that is lifted and propelled by four rotors and no tail rotor. It’s the most common form of hobby RC drones.
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3d printed quad frame
With their small size and maneuverability, these quadcopter drones can be flown indoors as well as outdoors. Besides that, at a small size, quadcopter drones are cheaper and more durable than conventional helicopters due to their mechanical simplicity.