The SR-71 was built as a military stealth reconnaissance plane that was faster and more agile than the current military rockets, bullets, and even ground-to-air missiles of the time it was developed.
From the beginning of development, the Blackbird was intended to take the place of the Lockheed U-2 Dragon Lady for all recon roles. It was based on the existing XB-70 Valkyrie bomber frame and power plant, and vaguely resembles it.
Black
3.5
2193 mph
2200 mph
Stratosphere
The SR-71 Blackbird was introduced into service in 1966.
It is the Lockheed SR-71 "Blackbird", a reconnaissance aircraft.
If you are refering to the SR71 blackbird, the military plane, it was designed and built by Lockheed Martin. The SR-71 Blackbird was built by the famous Lockhead "Shunk Works" Heading up the team was Clarence L. "Kelly" Johnson one of aviation's most important aircraft designers.
No it just flew very high to avoid radar.
About 3 times the speed of sound. (3 mach)
No it is an advanced, long range, Mach 3+ strategic reconnaissance aircraft.
Boeing