Tyler Wynn
The sound barrier is not an invisible wall, but a term used to describe the drag and shockwaves that form around an aircraft as it approaches the speed of sound. The sound barrier was first broken by Chuck Yeager in 1947, flying at an altitude of 45,000 ft (13.7 km). Since then, several other aircraft have broken the sound barrier, including the Concorde, and there have been recent attempts by NASA to break the sound barrier without creating a sonic boom.
| Characteristics | Values |
|---|---|
| First human to break the sound barrier | Chuck Yeager |
| Date of first human breakthrough | 14 October 1947 |
| Aircraft used | Bell X-1 |
| Altitude | 45,000 ft (13.7 km) |
| Speed | 761.23 mph (1,225.1 km/h) |
| First supersonic airliner | Concorde |
| Year of first supersonic airliner | 1976 |
| Year supersonic flight was banned over land | 1973 |
| Year of first supersonic breakthrough by an object | 150 million years ago (theorised) |
| Object that first broke the sound barrier | Long-tailed dinosaurs (theorised) |
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What You'll Learn
The first person to break the sound barrier
On October 14, 1947, Captain Charles E. Chuck Yeager became the first person to fly faster than the speed of sound. Yeager, a test pilot, flew the experimental Bell X-1 rocket plane, nicknamed the "Glamorous Glennis" or "Glamorous Glenn", at Mach 1.05 and an altitude of 45,000 feet (13,700 m) over Rogers Dry Lake in California's Mojave Desert. As he passed through the sound barrier, a sonic boom was heard across the desert.
There are several other claimed instances of pilots breaking the sound barrier prior to Yeager's flight. German pilot Lothar Sieber was estimated to have broken the sound barrier during a fatal test flight of the rocket-powered Bachem Natter on March 1, 1945, although the speed was not officially measured. In his 1990 book, former Messerschmitt Me 163 Komet pilot Mano Ziegler claimed that his friend, test pilot Heini Dittmar, broke the sound barrier on July 6, 1944, reaching 1,130 km/h in a dive. There is also a disputed claim by German pilot Hans Guido Mutke that he broke the sound barrier on April 9, 1945.
Additionally, there is anecdotal evidence that American pilot George Welch may have broken the sound barrier on October 1, 1947, and again on October 14, 1947, just 30 minutes before Yeager's historic flight. However, the precision instruments used to carefully document Yeager's speed were not utilised during Welch's flights. Yeager himself acknowledged the possibility that someone may have flown supersonic before him, stating that "the sound barrier wasn't something that just one person broke through. It was a series of events that got us through, and each step built on the previous ones."
Regardless of the claims and counterclaims, Yeager's achievement in breaking the sound barrier remains a significant milestone in aviation history. He received recognition for his feat, including the Collier and Mackay Trophies in 1948 and induction into the National Aviation Hall of Fame in 1973.
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The Bell X-1
The X-1's design was the result of a cooperative program between the National Advisory Committee for Aeronautics (NACA) and the U.S. Army Air Forces (later the U.S. Air Force) to develop manned transonic and supersonic research aircraft. The X-1 was powered by a liquid-fuelled rocket engine designed by American engineer James Hart Wyld. The rocket engine was a four-chamber design built by Reaction Motors Inc., with individually controllable chambers to adjust thrust.
On October 14, 1947, the Bell X-1, piloted by U.S. Air Force Captain Charles E. "Chuck" Yeager, broke the sound barrier, reaching a speed of 1,127 kilometres (700 miles) per hour, or Mach 1.06, at an altitude of 13,000 metres (43,000 feet). Yeager named the aircraft "'Glamorous Glennis" in tribute to his wife. The X-1 was air-launched from a Boeing B-29 bomber over the Mojave Desert in California. This historic flight marked the beginning of the supersonic period in aviation history.
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Supersonic flight bans
However, the loud sonic booms associated with supersonic flight led to restrictions and bans. In 1973, the United States banned supersonic flight over land, hindering the advancement of supersonic aviation technology. This ban remained in place for over 50 years, until 2025, when President Trump issued an executive order lifting the restriction. The order requires the Federal Aviation Administration (FAA) to repeal the supersonic speed limit as long as aircraft do not produce an audible sonic boom.
The development of Boomless Cruise technology, which allows supersonic flight without generating disruptive sonic booms, has been pivotal in reconsidering the ban. Companies like Boom Supersonic have successfully tested this technology, demonstrating that supersonic flight can be achieved without causing noise disturbances on the ground.
The repeal of the supersonic flight ban in the United States has significant implications for the aviation industry. It unlocks the potential for faster travel, with companies like Boom Supersonic aiming to bring the benefits of supersonic flight to a wider range of travellers. Additionally, it encourages innovation in high-speed aviation, with the promise of faster, quieter, safer, and more efficient air travel.
While the ban has been lifted in the United States, international regulations on supersonic flight vary. The Secretary of Transportation and the Administrator of the FAA are engaging with the International Civil Aviation Organization and foreign partners to seek global alignment on supersonic regulatory approaches and ensure the safe international operation of supersonic aircraft.
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The sound barrier is not an invisible wall
The sound barrier is not a physical barrier, but rather a term used to describe the difficulties in aircraft design and performance when approaching and exceeding the speed of sound. The term "sound barrier" was coined due to the challenges and risks associated with aircraft attempting to fly faster than sound. As an aircraft approaches supersonic speeds, it encounters a sharp increase in drag and shockwaves, which can lead to significant flow separation and create a "barrier" to further acceleration. This phenomenon is often referred to as a "wall" that needs to be "broken" through.
The sound barrier has been broken by multiple aircraft since Yeager's historic flight, including the Concorde, which operated as a commercial supersonic airliner from 1976 to 2003. However, breaking the sound barrier remains a challenge due to the technical difficulties and the loud sonic booms created by supersonic flight. These sonic booms have led to restrictions and bans on supersonic flight over land, with engineers working to minimize their impact.
Despite the challenges, there have been recent advancements in breaking the sound barrier. NASA, for example, has been working on the X-59 aircraft as part of its Quesst mission to enable commercial supersonic travel over land by reducing the intensity of sonic booms. Additionally, companies like Boom Supersonic are developing new technologies and aircraft, such as the XB-1, which successfully completed a supersonic flight in February 2025, as captured in an incredible NASA photo.
While the term "sound barrier" evokes an image of an invisible wall, it is not an accurate representation. It is a figurative expression used to describe the technical and physical challenges of achieving supersonic flight. Breaking the sound barrier involves overcoming these challenges and reaching speeds greater than the speed of sound, which is approximately 761-768 miles per hour (1,225-1,234 kilometers per hour) under normal conditions.
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The human body can move without injury at the speed of sound
The sound barrier refers to the difficulties aircraft face when attempting to exceed the speed of sound. The term originated during and after World War II, when aircraft designers and aerodynamicists discussed Mach 0.7 as a dangerous limit to exceed. The sound barrier was first broken by Chuck Yeager in 1947, flying at an altitude of 45,000 ft (13.7 km). This achievement proved that the human body could move at the speed of sound without injury, paving the way for future space exploration.
Before Yeager's feat, conventional wisdom held that humans could not exceed the speed of sound. Bullets and cannonballs had been travelling faster than sound for years, but it was thought that humans could not. The sound barrier was thought of as an invisible wall, a notion that was dispelled by Yeager's successful flight.
There have been other claims of breaking the sound barrier before Yeager. Hans Guido Mutke claimed to have broken the sound barrier in 1945 in a Messerschmitt Me 262 jet aircraft. However, this claim is widely disputed, even by pilots in his unit. In 1999, Mutke enlisted the help of Professor Otto Wagner of the Munich Technical University to run computational tests, but accurate data was lacking. George Welch also claimed to have broken the sound barrier on October 1, 1947, but his flights were not properly monitored and are not officially recognized.
Since Yeager's historic flight, there have been continued efforts to improve supersonic flight. The Concorde, a faster-than-sound airliner, operated from 1976 to 2003. NASA has also been working on enabling commercial supersonic travel over land through projects like the Low Boom Flight Demonstrator and the X-59. These projects aim to minimize the loud sonic booms that led to the banning of supersonic flight over land in 1973.
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Frequently asked questions
The sound barrier is the sudden increase in aircraft drag as it approaches the speed of sound. This is caused by shockwaves forming in the accelerated flow over a wing. It is not an invisible wall.
Yes, the sound barrier was first broken by Chuck Yeager in 1947, flying the Bell X-1 at an altitude of 45,000 ft. Since then, the Concorde, a supersonic airliner, has also broken the sound barrier.
Yes, bullets and cannonballs have exceeded the speed of sound for years. There is also a theoretical claim that certain long-tailed dinosaurs may have been able to flick their tails at supersonic speeds.
Breaking the sound barrier creates a sonic boom, a loud noise that has led to supersonic flight being banned over land. NASA is currently working on a project to reduce the intensity of these booms.
