The F-106X (Model 8-28/8-29), a 1956 Advanced Delta Dart design study envisaged an interceptor with a canard layout powered by a JT4B-22 turbojet fed by two Rectangular Air Intakes, envisaged as an alternative to the Lockheed YF-12 (later SR-71) to have a fire control system with "look-down, shoot-down" capability fed by a 40-inch radar dish. The F-106X concept was extremely advanced for its time with Mach 5 performance envisaged. The project was later re-designated F-106C/D, with "C" being the single-seat version, the "D" being the two-seat version. At one time the Air Force had considered acquiring 350 of these advanced interceptors, but the F-106C/D project was cancelled on 23 September 1958. Following the cancellation of the Model 8-28/29 project, two production F-106A's; 57-0239 and 57-0240, were modified to test the new radar housing with a five-foot nose extension. They were re-designated F-106C. Only 57-0239 actually flew, and made ten flights with this new nose in 1959. The plane was later destroyed in fatigue tests. 57-0240 eventually reverted to standard F-106A configuration


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