TOP-TEN SIMILARITIES OF THE XB-70 AND XR-12 - What did these two exotic aircraft have in common?

Built nearly 20 years apart, both these Air Force aircraft were the fastest ever flown for their size and powerplants. Two of each type were built, with the second prototype being lost in an accident, and many other similarities are covered as well. Links to other videos mentioned are:

XB-70 Accident: https://www.youtube.com/watch?v=Cn_Ulu6H4y4&t=10s
Republic XR-12 History: https://www.youtube.com/watch?v=ZTy0zyfP6KI
North American XB-70 History: https://www.youtube.com/watch?v=00fzinTHoE8

Видео TOP-TEN SIMILARITIES OF THE XB-70 AND XR-12 - What did these two exotic aircraft have in common? канала Celebrating Aviation with Mike Machat