Lord Blackadder said:
Of course its speed was its real defense - I don't think that aircraft could be intercepted even today.
Two good books on the SR-71:
- Sled Driver
- Untouchables
Would highly recommend reading them.
BTW, the SR-71 was originally designated the RS-71. Around 1964, then President Johnson incorrectly called it the SR-71. Rather than acknowledge the error, everything including blueprints, diagrams, manuals, etc. were changed to read SR-71 vice RS-71.
The SR-71 was designed to fly MACH 3.2 at 80,000 feet.
If memory serves, in the book Untouchables, Brian Shul mentions that they hit MACH 3.45 at 85,000 feet while flying over Libia.
As for the SAM threat, Russia had missiles that could shoot down the SR-71 while it was still operational. However, by that time, both countries realized that overhead monitoring was a good thing.
Lord Blackadder said:
I don't know. I do know that the flying-wing form factor gives it a very low physical (and radar) profile in the horizontal plane, and it makes use of supposedly more effective radar-absorbant material.
Raw computer power. When the F117A was designed, available computers could only handle the calculations in 2D, hense the flat panels. By the time the B-2 came around available computers could handle the 3D calculations.
BTW, the stealth equations came from the Russians.
BTW2, the majority of titanium for the SR-71 came from the Russians.