Powered by two Lycoming O-435 engines of 220 horsepower (160 kW) each, the TDR-1 used a remarkably simple design, with a steel-tube frame constructed by the Schwinn bicycle company covered with a molded wood skin, thus making little use of strategic materials so as not to impede production of higher priority aircraft. Ĭontrol of the TDR-1 would be conducted from either a control aircraft, usually a Grumman TBF Avenger, with the operator viewing a television screen showing the view from a camera mounted aboard the drone along with the radar altimeter's readout, or via a pilot on board the TDR-1 for test flights. That same month, following trials of the Naval Aircraft Factory TDN assault drone, Interstate Aircraft received a contract from the Navy for two prototype and 100 production aircraft to a simplified and improved design, to be designated TDR-1. Due to the limitations of the technology of the time, development of the "assault drone" project was given a low priority, but by the early 1940s the development of the radar altimeter and television made the project more feasible, and following trials using converted manned aircraft, the first operational test of a drone against a naval target was conducted in April 1942. Fahrney proposed that unpiloted, remotely controlled aircraft had potential for use by the United States Navy in combat operations. The type saw some service in the Pacific Theater against the Japanese, but continuing developmental issues affecting the aircraft, along with the success of operations using more conventional weapons, led to the decision being made to cancel the assault drone program in October 1944. Capable of being armed with bombs or torpedoes, 2000 aircraft were ordered, but only around 200 were built. ![]() The Interstate TDR was an early unmanned combat aerial vehicle - referred to at the time as an " assault drone" - developed by the Interstate Aircraft and Engineering Corporation during the Second World War for use by the United States Navy.
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