Silent Arrow is a new take on the delivery drone by replacing the common rotors with a duo glider with full-length elevons on all wings. Since there are no propellers, there is no sound, making the Silent Arrow virtually undetectable. The drone has pretty impressive specs with a range of 35 nautical miles, max cargo weight of 1,631 pounds, and a landing accuracy of 100 meters. Silent Arrow is fully autonomous using a modified Pixhawk Cube with built-in GPS, LiDAR, and an FPV camera.