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el Radioplano BTT, conocido como RP-71 por la compañía, como WS-426/2 por la Armada de los Estados Unidos, y como WS-462/2 por la Fuerza Aérea de los Estados Unidos, es una familia de drones de objetivo producidos por la Radioplane Company (más tarde una división de Northrop).

MQM-57 Halconero: A variant of the BTT designated the RP-71, also known as the SD-1 Observer and later redesignated MQM-57 Falconer, was built for battlefield reconnaissance, with first flight in 1955. The Falconer was similar in appearance to the Shelduck, but had a slightly longer and stockier fuselage. It had an autopilot system with radio-control backup, and could carry cameras, as well as illumination flares for night reconnaissance. Equipment was loaded through a hump in the back between the wings. Although it only had an endurance of a little more than a half-hour, making it of limited use, about 1,500 Falconers were built and the type was used internationally with several different military forces, remaining in service into the 1970s. Over 73,000 BTT targets were built in all, and the type was used by at least 18 nations. Some may still be lingering in service.

Fuente: Radioplane BTT en Wikipedia