Heinkel HD 15
| Industry | Aerospace |
|---|---|
| Products | Aircraft |
Design
The Heinkel HD 15 was a single-engine biplane seaplane featuring a central hull and constructed entirely from wood. Its design included a biplane wing arrangement and was powered by a single engine mounted in a tractor configuration. The fuselage housed three separate open cockpits: the foremost compartment, designated for the pilot, was notably positioned ahead of the lower wing's leading edge and directly beneath the propeller, while the two aft cockpits were intended for either passengers or postal cargo.
Development
During the 1920s, Heinkel received a request from the Imperial Japanese Navy to develop a steam-powered aircraft catapult for the battleship Nagato. This innovation aimed to enable reconnaissance seaplanes to be launched directly from the ship’s deck, significantly reducing the time compared to traditional crane-based sea launches.
This research also drew interest from leaders of the Reichsmarine, Germany’s navy at the time, though they were restricted by the Treaty of Versailles from formally adopting new military technologies. In 1927, however, the Ministry of Transport issued specifications for an aircraft designed to streamline mail delivery on transatlantic shipping routes. The plan involved equipping large passenger liners with catapult systems similar to those used in military applications.
The HD 15 prototype was constructed within that year alongside a compatible catapult installed aboard the transatlantic liner TS Bremen, operated by Norddeutscher Lloyd and registered as D-1237. Flight tests were conducted briefly toward the end of 1928; however, the HD 15 never entered active service. Despite remaining a prototype, it served as the foundation for the Heinkel HD 55, which subsequently saw operational deployment with the Soviet Navy.