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AGM-78 is a derivative of  RIM-66A (SM-1MR block I) with the same airframe and the same MK-27 MoD 4 dual thrust rocket motor. The only thing changed is the AGM-45A-3Aa seeker

RIM-66A (SM-1MR block I) top speed is Mach 1.8 and max range is  32 km.

RIM-66B (SM-1MR Block V) top speed is Mach 3.5 and max range is 46 km thanks to the new MK56 dual thrust rocket motor.

For comparison, max range of AGM-78 is 90 km

But there are conflicting information about its top speed: some source say top speed is Mach 2.5 while some say top speed is Mach 1.8

On one hand, it makes sense that AGM-78 is faster than RIM-66A because it is basically an air launched RIM-66A

On the other hand, kinda strange that they make the replacement AGM-88 slower than AGM-78?.

Do anyone have reliable information about this


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