The dynamic pressure of going Mach 2.6 at 61,000 feet is equivalent to 450 knots at sea level—quite a bit less violent than what Udell endured, shockwaves and t

The dynamic pressure of going Mach 2.6 at 61,000 feet is equivalent to 450 knots at sea level—quite a bit less violent than what Udell endured, shockwaves and temperature extremes notwithstanding.