Foldable Drone Flies through Narrow Holes for Rescue Missions

Inspired by birds that fold their wings in the air when space is limited, researchers from the University of Zurich  and EPFL have developed a new foldable drone. The researchers designed the quadrocopter with four independently rotating propellers. The propellers are mounted on mobile arms that can be pivoted around the main frame with the help of servomotors. The control system regulates, in real time, each new position of the arms and adjusts the propeller speed depending on the center of gravity. The drone's default configuration is X-shaped, but it can adapt into H, O, and T shapes.