The Radioplane BTT, known as RP-71 by the company, was a family of target drones produced by the Radioplane Company, and later Northrop.
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Radioplane was bought out by Northrop in 1952 to become the Northrop Ventura Division, though it appears that the "Radioplane" name lingered on for a while.
Required to be jet-powered to provide the most reallistic training, the contract for the development of the drone was given to the Radioplane Company, later a division of Northrop.
The Radioplane XKD4R, known by the company designation RP-70, was an American target drone developed by the Radioplane Division of the Northrop Corporation.