Naval Aircraft Factory TDN
Early U.S. Navy assault drone, never used operationally.
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The Naval Aircraft Factory TDN, known in its time as an "assault drone," was an early unmanned combat aerial vehicle built by the U.S. Navy’s Naval Aircraft Factory during World War II. It was tested in 1942 and 1943, showing moderate promise, but newer drone designs pushed the TDN-1 into secondary roles. None ever saw combat.
By early 1942, radar altimeters and television technology made remote-controlled bomb or torpedo aircraft feasible. In January 1942, the Naval Aircraft Factory got orders to start work, with prototype construction approved the next month. A contract for 100 aircraft followed in March, and John S. Kean managed the project.
The TDN-1 could use either television or radar guidance. It was mostly made of wood, had fixed tricycle landing gear, and could swap its guidance gear for a conventional cockpit during test flights. To avoid slowing higher-priority projects, the last thirty units were built by Brunswick-Balke-Collender Company, a Michigan firm known for bowling balls and billiard tables.
All 100 TDN-1s were ordered in March 1942. Though designed to be simple and low-performance, and despite promising tests, the drone was deemed too complex and costly for actual use.
The improved Interstate TDR was chosen instead. Most TDN-1s ended up in testing, liaison, and training roles, with some used as aerial targets. The TDN-1 is often noted as the first U.S. drone to take off freely from an aircraft carrier (the USS Sable), though an Airspeed Queen Wasp had already been catapulted from HMS Pegasus in 1937.
Variants included the XTDN-1, four prototypes with Franklin O-300 engines, and the TDN-1, the production version of which 100 were built. The only operator was the United States Navy.
Background
The development of the radar altimeter and television in the early 1940s made remotely guided bomb- or torpedo-carrying aircraft a practical proposition. In January 1942, the Naval Aircraft Factory was instructed to initiate the development of such an aircraft, with a go-ahead for prototype construction being given in February. A production contract for 100 aircraft was issued in March, with John S. Kean being assigned as TDN-1 project manager, with the aircraft being designed to be capable of using either television or radar guidance. Constructed mainly from wood, the TDN-1 had a fixed tricycle landing gear, and could be fitted with a conventional cockpit in place of its guidance equipment for test flights.
In an example of the use of companies traditionally uninvolved in the aviation industry to reduce interference with higher priority projects, production of the final thirty aircraft was licensed to the Brunswick-Balke-Collender Company, a Michigan-based manufacturer of bowling balls and billiard tables. One hundred production TDN-1 aircraft were ordered in March 1942. Despite being specifically designed to be a simple, low-performance aircraft, and despite proving promising in testing, the type was considered to be too complicated and expensive for use operationally. The improved Interstate TDR was selected for development as an alternative, the majority of TDN-1s being used in the test, liaison and training roles, with some being expended as aerial targets.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Naval Aircraft Factory TDN (CC BY-SA 4.0).
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