| Caspar U.1 | |
|---|---|
 | |
| U.1 under test by the US Navy | |
| Role | Submarine-launched patrol seaplane |
| National origin | Germany |
| Manufacturer | Caspar-Werke |
| Designer | Ernst Heinkel |
| First flight | 1922 |
| Primary user | Reichsmarine |
| Number built | 3 |
The Caspar U.1 (sometimes known as the Caspar-Heinkel U.1) was a 1920s German patrol seaplane designed by Ernst Heinkel and built by Caspar-Werke. [1] The U.1 was designed to fit into a cylindrical container to allow it to be carried, then launched from a submarine. [1]
The U.1 was designed to meet a requirement to fit inside a cylindrical container 7.40 metres (24.3 ft) long with a diameter of 1.70 m (5 ft 7 in); this allowed the aircraft to be carried by a submarine. [1] To reduce the time to launch the aircraft, it was built as a cantilever biplane to remove the need to rig struts and wires on assembly. [1] The U.1 had two single-step floats and was powered by a front-mounted 55-horsepower (41 kW) Siemens radial piston engine. [1] The pilot had an open cockpit behind the upper wing which gave a clear view forward. [1] It is claimed that during tests, four men could remove the U.1 from the container and erect it in 1 minute 3 seconds. [1] Two aircraft were bought by the United States Navy for evaluation; [1] these were delivered to Naval Air Station Anacostia in late 1922, and were tested during 1923; one of the aircraft was damaged beyond repair whilst mounted on a truck for a parade. [2]
Germany 
United States Data from Flight, June 1923 [3]
General characteristics
Performance
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