SR-71 Blackbird Pilots and RSOs, even with gloves on, couldn’t keep their hands by the glass for more than a few seconds without doing damage
Throughout its service, the SR-71 Blackbird collected intelligence in some of the most dangerous areas around the globe. It was specifically designed to function at extremely high speeds, altitudes, and temperatures. In fact, the SR-71 was the first aircraft made with titanium because the heat generated by air friction at Mach 2.6 would have melted a standard aluminum frame.
The SR-71’s engineering was so advanced that even the equipment required to construct it had to be created from the ground up. There are countless fascinating details about the iconic Blackbird.
For example, the SR-71 cockpit canopy was constructed from solid quartz glass that was 1.25 inches thick. This special quartz glass became so hot during flight that it felt warm to the touch from inside the cockpit!
Military Machine reports that even with gloves, SR-71 Blackbird pilots and RSOs couldn’t touch the canopy glass for more than a few seconds without risking injury. To keep them safe, the crew relied on pressurized suits made by the David Clark Company, which allowed them to survive altitudes that would otherwise be fatal. One such crew member, Col. Richard (Butch) Sheffield, served as the Reconnaissance Systems Officer (RSO) for the Blackbird for eight and a half years.
Let’s look at the SR-71’s windows and the intense heat faced by the windshield at its maximum speeds. Skunk Works engineers determined that solid quartz was the best material for the windshield to prevent blurring or distortion under extreme conditions. To achieve this, they ultrasonically bonded the solid quartz directly to the titanium structure of the aircraft, which also contributed to a quieter cockpit. The exterior of the cockpit could reach estimated temperatures of 600 degrees Fahrenheit.
According to the SR-71 Blackbird website, the double solid quartz camera window required special engineering because extreme external heat (600°F) and a significantly cooler inside temperature (150°F) could cause optical distortion, making the cameras unable to capture clear images. After three years and $2 million, Corning Glass Works developed a solution: they fused the window to its metal frame using a new high-frequency sound wave technique.
Check out the Born into the Wilde Blue Yonder Facebook page for further Blackbird photos and stories.
Photo by Curt Mason, U.S. Air Force and NASA
