Quadcopter Drone (or Spider-Drone)

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A quadcopter or quadrotor is a type of helicopter with four rotors. The small size and low inertia of drones allow the use of a particularly simple flight control system, which has greatly increased the practicality of the small quadrotor in this application. Drones can go places that humans can't access, so they are an ideal solution for dangerous search and rescue efforts, as well as for delivering emergency supplies to remote locations and disaster areas.And, since a quadcopter has fixed wings, it gives it the ability to reach higher altitudes with ease.