Re swing-wing v. delta for SST,
True, Boeing's initial design for the 2707 used a swing-wing, great numbers on paper but the hardware to secure and move 'em weighed something like 40,000 pounds- they never did get the weight under control, went with a more conventional delta in the redesign prior to its cancellation.
I talked with a fellow that was on Pan Am's SST selection committee who told me that his favorite was the Lockheed design for that reason...in the end Boeing's was quite similar to Lockheed/Tupolev/BAC-Sud Ouest. At least the engines were completed, really impressive numbers, something like 67,000lb st w/reheat/AB
Shame it was never built, I suppose if the US hadn't wasted so much money in 'Nam it might have been a reality. Hats off to the Anglo-French alliance for seeing it through!
TT