Mason Blake
The sound barrier is the point at which an aircraft equals or surpasses the speed of sound, also known as exceeding Mach 1. As aircraft approach the speed of sound, they experience a sharp increase in aerodynamic drag, which can make it difficult to continue accelerating. This phenomenon was first observed during World War II, when pilots of high-speed fighter aircraft experienced adverse effects that seemed to impede flight at speeds close to the speed of sound. The sound barrier was officially broken in 1947 by pilot Chuck Yeager in the Bell X-1, although there are unofficial claims that it was broken earlier during World War II. Today, the development of supersonic aircraft continues, with companies like NASA, Boeing, and Lockheed Martin working on overcoming the challenges of supersonic flight for passenger travel.
| Characteristics | Values |
|---|---|
| Definition | The sound barrier is the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or other object when it approaches the speed of sound. |
| Speed | Mach 1 (about 767 mph or 1,125 ft/s) in dry air at 20 °C (68 °F). The speed varies with altitude and temperature. |
| History | The term "sound barrier" came into use during World War II when pilots of high-speed fighter aircraft experienced adverse effects that seemed to impede flight at speeds close to the speed of sound. |
| Challenges | Increased drag, airflow disruption, control issues, structural stress, and instrument malfunctions. |
| Breakthroughs | Chuck Yeager in 1947 with the experimental Bell X-1 jet; Felix Baumgartner during a freefall in 2012; F/A-18 Hornet in 1999. |
| Supersonic Flight | Achieved by the Concorde, which travelled at twice the speed of sound, and military aircraft like the Lockheed Martin SR-71 Blackbird. |
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The speed of sound
The concept of breaking the sound barrier, or achieving supersonic speed, became particularly relevant during World War II with the development of high-speed military aircraft. Pilots of these aircraft experienced a phenomenon known as "compressibility" or "Mach tuck", where changing airflow over the wings altered the wings' centre of pressure, causing the aircraft to pitch downward. This, along with other adverse effects, created a barrier that made faster speeds very difficult or impossible. Despite these challenges, there were several claims that the sound barrier was broken during World War II, although most of these have been dismissed as instrumentation errors.
It was not until 1947 that the sound barrier was officially broken by pilot Chuck Yeager in the Bell X-1, which he nicknamed "Glamorous Glennis". Yeager achieved a speed of Mach 1.06 (approximately 700 mph) at 43,000 feet. Since then, aircraft have been designed specifically for supersonic flight, and the speed record for a manned aircraft has been continuously pushed higher. As of 2025, the record is Mach 6.72 (4,535 mph), set in 1967 by William J. "Pete" Knight in an experimental rocket-powered aircraft. However, unofficial speeds may have exceeded this record, and supersonic passenger air travel is still being pursued by companies such as NASA, Boeing, and Lockheed Martin.
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Mach speed
The sound barrier or sonic barrier refers to the sharp increase in aerodynamic drag and other adverse effects experienced by an aircraft approaching the speed of sound. This barrier made faster supersonic speeds very difficult or impossible for aircraft that were not specifically designed for supersonic flight. The sound barrier was first theorised by British aerodynamicist W. F. Hilton in 1935 and became a significant concern for aircraft designers during World War II.
Mach number is a measure of the compressibility characteristics of fluid flow, which can be a gas or a liquid. It is named after Austrian physicist and philosopher Ernst Mach. The Mach number is a dimensionless quantity as it is defined as the ratio of two speeds. Mach speed is typically used to refer to speeds above the speed of sound, or supersonic speeds. Mach 1 is the speed of sound, and the speed required to break the sound barrier.
When an aircraft exceeds Mach 1, it creates a large pressure difference just in front of it, known as a shock wave. This shock wave spreads backward and outward from the aircraft in a cone shape, known as a Mach cone. As the speed increases, the cone becomes more narrow. This shock wave is what causes the sonic boom heard when a supersonic aircraft passes overhead.
The speed of sound is not constant and changes with the temperature of the surrounding air. In dry air at 20°C, the speed of sound is 343 metres per second or about 767 miles per hour. At an altitude of 11,000 meters, the speed of sound decreases to 295 metres per second or 659.9 miles per hour.
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Supersonic flight
The term "sound barrier" refers to the sharp increase in aerodynamic drag and other adverse effects experienced by an aircraft as it approaches the speed of sound. These effects made faster speeds extremely difficult or seemingly impossible, thus creating a "barrier". During World War II, pilots of high-speed fighter aircraft experienced these effects, which included severe buffeting, stability difficulties, and loss of control. As a result, aircraft designers debated whether piloted airplanes could ever safely exceed the sound barrier.
The sound barrier was officially broken for the first time in 1947 by Chuck Yeager, who flew at supersonic speed in the Bell X-1 "Glamorous Glennis". However, there were unofficial claims of breaking the sound barrier during World War II, and some disputed reports suggest that certain long-tailed dinosaurs may have been capable of supersonic speeds.
Since Yeager's achievement, several aircraft have exceeded supersonic speeds, including the Concorde, which could fly at twice the speed of sound, and the Lockheed SR-71 Blackbird, which is capable of sustained speeds exceeding Mach 3. In addition, Austrian skydiver Felix Baumgartner broke the sound barrier during a freefall skydive in 2012, becoming the first human to do so without being strapped into a vehicle.
Despite the achievements in supersonic flight, there have also been notable crashes and disasters associated with breaking the sound barrier, such as the 2000 crash of an Air France Concorde that killed all passengers and crew on board. Additionally, the development of supersonic passenger air travel has faced challenges, including high operating costs and the need to overcome the loud noise of the sonic boom. However, companies like NASA, Boeing, and Lockheed Martin are still working on advancing supersonic technology for future use.
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Sonic booms
The sound barrier or sonic barrier refers to the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or any other object when it approaches the speed of sound. The speed of sound is about 767 miles per hour or 1234 kilometres per hour in dry air at 20 degrees Celsius.
As an aircraft approaches the speed of sound, the pressure waves or sound waves it creates outpace the aircraft and spread out in front of it. Once the aircraft reaches the speed of sound, these waves are unable to get out of its way and form strong local shock waves on the wings and body. This results in an unstable airflow around the aircraft, leading to severe buffeting and serious stability issues.
When an aircraft exceeds the speed of sound, it creates a sonic boom. A sonic boom is a loud, booming noise similar to an explosion, thunder, or a cracking sound. It is caused by the formation of shock waves as the aircraft travels faster than the speed of sound, resulting in a ripple effect in the air pressure waves. The power or volume of the shock wave depends on the quantity of air being accelerated and the size and shape of the aircraft. The boom's intensity can potentially harm one's hearing if they are too close to its source.
The characteristics of the sonic boom, including its lateral spread and impact area, are influenced by factors such as the aircraft's altitude, flight path, length, and speed relative to the speed of sound. The higher the aircraft flies, the greater the horizontal distance the sonic boom will cover. Additionally, the aircraft's length affects the "length" of the boom, with longer aircraft creating less powerful booms that spread out more than those of smaller aircraft.
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Breaking the sound barrier
The sound barrier is the point at which an aircraft equals or surpasses the speed of sound, also known as exceeding Mach 1. The speed of sound is approximately 767 mph (343 meters per second) at sea level and 68 degrees Fahrenheit. As an aircraft approaches the sound barrier, it experiences a sharp increase in aerodynamic drag and other adverse effects, making it difficult to accelerate further. This phenomenon, known as "compressibility" or "Mach tuck," occurs due to the formation of shock waves on the aircraft's wings and body, leading to unsteady airflow and severe buffeting.
The first official breaking of the sound barrier by an aircraft occurred in 1947 when Chuck Yeager piloted the Bell X-1, nicknamed "Glamorous Glennis," to a speed of Mach 1.06 (700 miles per hour) at 43,000 feet. This achievement marked a significant milestone in aviation and dispelled the notion of an impenetrable sonic barrier.
Since Yeager's historic flight, several aircraft have broken the sound barrier, including the F/A-18 Hornet in 1999 and the Lockheed SR-71 Blackbird, which is capable of sustained speeds exceeding Mach 3. In recent years, NASA and companies like Boeing, Lockheed Martin, and Aerion have been working on developing supersonic technology for passenger air travel.
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Frequently asked questions
The sound barrier speed, also known as Mach 1, is the speed at which an aircraft equals the speed of sound. In dry air at 20°C (68°F), the speed of sound is 343 metres per second (approximately 767 mph).
The term "sound barrier" comes from the large increase in aerodynamic drag and other adverse effects experienced by an aircraft as it approaches the speed of sound, historically making faster speeds very difficult or impossible.
When an aircraft breaks the sound barrier, it creates a shock wave known as a "sonic boom", which occurs when the aircraft moves faster than the speed of sound, resulting in a sudden release of pressure waves.
Yes, the sound barrier was first officially broken by pilot Chuck Yeager in 1947 in the Bell X-1, nicknamed "Glamorous Glennis". Austrian skydiver Felix Baumgartner also broke the sound barrier in 2012 during a free-fall skydive.
Mach speed, or the Mach number, is the ratio of the speed of an object to the speed of sound. This ratio is dependent on atmospheric conditions, with the velocity needed to achieve the speed of sound decreasing as altitude increases.
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