The Focke-Achgelis Fa 330 "Bachstelze" (Water Wagtail) was a 1942 German towed, single-seat unpowered autogyro kite, used by U-boats for aerial reconnaissance. It was deployed behind surfaced submarines, allowing observers to spot targets up to 53 kilometers away, compared to just 10 km from the conning tower. Key Technical and Operational Details: Design & Deployment: Constructed with a three-bladed rotor and steel tube frame, the 330 could be disassembled in minutes and stored in water-tight t