Quadcopter Drone

Overview

A quadcopter is a rotary-wing aircraft lifted and steered by four fixed-pitch propellers arranged at the corners of an X-shaped frame. With no swashplate or tail rotor, it controls itself purely by varying the speed of its four motors, which makes it mechanically simple and highly maneuverable. This class carries a stabilized camera on a motorized gimbal, GPS for position hold, and a radio link back to a ground controller, the configuration used for aerial photography and inspection.

How it works

Lift comes from four Propulsion Arm units, each a carbon tube carrying a brushless motor, an electronic speed controller, and a propeller. Two rotors spin clockwise and two counter-clockwise so their torques cancel in steady hover. The aircraft maneuvers by differential thrust: speeding up one pair and slowing the other rolls, pitches, or yaws the craft without any moving control surfaces.

Coordinating all four motors is the Flight Controller, which fuses readings from an inertial measurement unit and a barometer hundreds of times per second to estimate attitude and altitude, then commands each speed controller to hold the craft stable. The GPS Module adds absolute position so the drone can hover in place or follow a waypoint route against wind. Pilot commands arrive over the Radio Link link, which also streams telemetry and a video feed back to the operator.

Power for the entire vehicle comes from the LiPo Battery, a lithium-polymer pack whose high discharge rate feeds the motors during aggressive maneuvers. Imaging is the payload's purpose: the Gimbal Camera mounts the sensor on a three-axis motorized gimbal that actively counter-rotates against the airframe's motion, isolating the camera from vibration and tilt to keep footage level and smooth. The Airframe ties these subsystems together while keeping mass low enough to maximize flight time.