Awang se said:
did F-108 have a range to escort the bombers? i thougt it is F-15.
It did, but the plane was deemed unnecessary as the XB-70 was cancelled.
It would have been an interesting combination. IIRC the F108 was substantially quicker than other escort aircraft of the period.
On the other data, there is some available if you look at the F-15 and F-14 history sites. I am going off memory here as I once did a paper on high speed interceptors from the 60's and 70's.
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In 1955, USAF launched the program of LRIX (Long-Range Interceptor Experiment), that the fighter was to be capable of March 3 performance and could destroy attacking Soviet bombers over the poles before they could get near U.S. territory. As it was also to be the escort fighter for the XB-70 bomber that was built by North American Aviation, the company also was issued a contract for two prototypes which designated F-108A Rapier. The F-108A was designed as a large delta-winged aircraft, powered by a pair of after burning turbojets. A mockup was inspected in January 1959 with planned first flight in 1961. However, by mid 1959, the threat from Soviet Union was perceived to be its intercontinental ballistic missiles instead of its force of long-range bombers. Against the ballistic missiles, F-108 would be completely useless. The program was cancelled on September 1959.
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It was mach 3 capable, so it would have moved along fairly well.