Can sr-71 blackbird go to space?

Answer 1

No it didn't, but:

With a service ceiling service of 85,000 ft (25,900 m) the crews faced two main problems:

* Maintaining consciousness at high altitude

* Surviving ejection.

With a standard pressure demand oxygen mask, human lungs cannot absorb oxygen quickly enough above 43,000 ft (13,000 m). The pressure difference inside the mask versus the cockpit pressure on the chest also makes exhaling extremely difficult.

Ejection at Mach 3.2 would expose the pilot to an instant heat rise of approx 450 °F (230 °C) as a result of the air flow.

To solve these problems, the David Clark Company was hired to produce protective full pressure suits for the A-12, YF-12, MD-21 and the SR-71 aircraft.

The suits were later adapted for use by crews on the Space Shuttle.