Supersonic Speed Demons: Breaking the Sound Barrier

Bullets. Artillery. Horse whips.

Forty years ago, the Concorde made its first supersonic flight.

(AP Photo)

For a time, they all could do something humans only dreamed of: travel faster than the speed of sound.

But in the mid-1940s, developments in aviation technology soared. And in 1947, fighter pilot Chuck Yeager became the first man to ever exceed Mach 1.

After Yeager's most famous flight, the military continued to break records in airspeed, even developing an aircraft that could travel six times the speed of sound. But it wasn't until years later that Mach-breaking technology moved beyond the military.

On Oct. 1, 1969, the Concorde 001, a joint British-French venture, traveled faster than the speed of sound for the very first time. It was the aircraft's 45th test flight and it held Mach 1.05 for 9 minutes at 36,000 feet and 75 miles from Toulouse, France.

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It wasn't the first commercial aircraft to break the so-called "sound barrier." A few months earlier, the Russian Tupolev Tu-144 became the first commercial airliner to exceed the speed of sound. But unlike its competitor, the Concorde went on to have a relatively long life, carrying passengers across the Atlantic Ocean until it was retired in 2003.

'Sound Barrier' Hype Started in Lead-Up to WWII

"It was terrific," said Bob van der Linden, chairman of the aeronautics division at the Smithsonian's Air and Space Museum, who was a passenger aboard the Concorde's final flight.

Flying at Mach 1 is a little loud, he said, but otherwise it doesn't feel especially different from flying typical airliners.

And as for the entertainment?

"There is no movie," he said. Watching the plane pick up speed is thrilling enough.

"Everyone's eyes are glued to the Mach meter. As soon as it turns Mach 1, everyone applauds. At Mach 2, everyone applauds again," he said. "[Traveling] twice the speed of sound. That's just cool."

The hype surrounding Mach speeds and breaking the "sound barrier" started in the lead-up to and during World War II, said Peter Coen, principal investigator of the Supersonics Project at NASA's Langley Research Center.