I was surprised to read the XB-70 takeoff speed was 180 kt on what looked like a lightly loaded mission. Wonder what the takeoff speed is at max gross weight.
It's incredibly interesting comparing the XB-70 production with that of the Concorde. The XB-70 was produced about five years earlier, and presumably was more powerful, faster, and less of an engineering nightmare than the Concorde -- though they had similar ranges and gross weights. Never have quite figured out the details.
On another tangent, I wish someone would do some websites or books showing the INTERIORS of exotic military bombers. For example.. I've always heard that the XB-49 Flying Wing had crew berths in the wing.... sure wish I could see how they arranged all this and what it looks like. Wonder what the XB-70 has inside.