Elliot Kim
Breaking the sound barrier, also known as exceeding Mach 1, is when an aircraft equals or surpasses the speed of sound. The term Mach Number is named after Ernst Mach and was devised to describe the ratio of aircraft speed to the speed of sound. At sea level and 68 degrees Fahrenheit, the speed of sound is approximately 767 mph. As an aircraft approaches the sound barrier, increases in drag and other effects make it difficult to continue accelerating. This phenomenon, known as compressibility, causes a downward pitch in the aircraft as the airflow over the wings changes. Breaking the sound barrier creates a shock wave known as a sonic boom. The first crewed supersonic flight took place on October 14, 1947, piloted by Air Force Captain Charles Chuck Yeager in the Bell X-1, reaching a speed of Mach 1.06.
| Characteristics | Values |
|---|---|
| Definition | Crossing the sound barrier, also known as exceeding Mach 1, is the point at which an aircraft equals and surpasses the speed of sound. |
| Speed of sound | At sea level, the speed of sound is approximately 767 mph (343 m/s) at 68°F. Above 4,000 ft, the speed of sound is about 660 mph. |
| Mach Number | Named after Ernst Mach, it describes the ratio of aircraft speed to the speed of sound. |
| Formula | M=V/Vs (mach number = vehicle velocity/velocity of sound) |
| Sonic boom | When an aircraft moves faster than the speed of sound, it creates a shock wave called a "sonic boom". |
| Supersonic flight | Generally, aircraft designed for supersonic flight can pass through the sound barrier with little difficulty. However, aircraft designed for subsonic speeds may face challenges such as increased drag, stability issues, and loss of control. |
| First supersonic flight | On October 14, 1947, the Bell X-1, piloted by Captain Charles "Chuck" Yeager, became the first aircraft to break the sound barrier, reaching Mach 1.06 (361 m/s, 1,299 km/h, 807.2 mph). |
| First supersonic passenger aircraft | Concorde, which entered commercial service in 1976, was the first supersonic passenger aircraft. It could reach speeds of Mach 2.04 (around 1,354 mph or 2,170 kph). |
| First woman to break the sound barrier | Jacqueline Cochran became the first woman to break the sound barrier on May 18, 1953, flying the Sabre 3 at Rogers Dry Lake, California. |
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What You'll Learn
Mach Number and speed
The Mach number is a dimensionless quantity that is used to determine the compressibility characteristics of fluid flow. It is named after the physicist and philosopher Ernst Mach. The Mach number is defined as the ratio of two speeds, and it can be used to determine whether a flow can be treated as an incompressible flow. The speed of sound is also known as Mach 1, and it changes throughout the atmosphere based on the temperature at a given altitude.
Mach numbers above 1 are considered supersonic, while those below 1 are considered subsonic. As the Mach number increases, so does the strength of the shock wave, and the Mach cone becomes narrower. At supersonic speeds, the shock wave takes on a cone shape, and the flow is either completely supersonic or has a small subsonic area between the object's nose and the shock wave.
Breaking the sound barrier refers to reaching speeds faster than the speed of sound, or Mach 1. On October 14, 1947, the Bell X-1, piloted by US Air Force Captain Charles "Chuck" Yeager, became the first aircraft to break the sound barrier. The rocket-powered aircraft reached a maximum speed of Mach 1.06 (361 m/s, 1,299 km/h, 807.2 mph).
Prior to this, rocketry and artillery experts had routinely exceeded Mach 1, but aircraft designers during and after World War II considered Mach 0.7 to be a dangerous limit. The German V-2 ballistic missile, for example, broke the sound barrier as early as 1942 and routinely achieved Mach 4 during terminal descent by 1944. However, the first crewed supersonic flight by a dedicated aircraft was a significant milestone that dispelled fears of an invisible "barrier" that could destroy aircraft.
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Supersonic flight
Breaking the sound barrier creates a shock wave known as a "sonic boom", which occurs when an aircraft moves faster than the speed of sound, resulting in a sudden release of pressure waves. The term "sound barrier" is misleading as there is no physical barrier at the speed of sound. However, the effects of breaking the sound barrier can be dangerous, especially for aircraft designed for efficient operation at subsonic speeds. Strong local shock waves form on the wings and body, and airflow around the craft becomes unsteady, leading to severe buffeting and stability issues.
The development of supersonic flight capabilities was a significant area of research during and after World War II. The first crewed supersonic flight occurred on October 14, 1947, piloted by Air Force Captain Charles "Chuck" Yeager in a rocket-powered aircraft launched from a modified B-29 bomber. The aircraft, named Glamorous Glennis, reached a speed of Mach 1.06 (361 m/s, 1,299 km/h, 807.2 mph). This flight dispelled the belief that an invisible "barrier" in the sky could destroy aircraft attempting to break the sound barrier.
The first supersonic passenger aircraft, Concorde, entered commercial service in 1976 and could reach speeds of Mach 2.04. Jacqueline Cochran became the first woman to break the sound barrier on May 18, 1953, piloting a Sabre 3 at Rogers Dry Lake, California.
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Sonic booms
The term "sound barrier" refers to the sharp rise in aerodynamic drag that occurs when an aircraft approaches the speed of sound. This phenomenon was historically considered an obstacle to supersonic flight.
The power or volume of a sonic boom depends on the quantity of air being accelerated and the size and shape of the object creating it. Longer objects, such as aircraft, produce a "softer" sonic boom compared to smaller objects. The boom's intensity is measured in pounds per square foot of overpressure and increases with the speed and size of the object. While sonic booms are incredibly loud and can startle people, they rarely cause physical injury, according to NASA. However, they can cause minor damage to structures, especially with larger aircraft or those flying at low altitudes.
The first aircraft to officially break the sound barrier was the Bell X-1 rocket plane, piloted by Captain Charles "Chuck" Yeager, on October 14, 1947. This flight dispelled the notion of an invisible "barrier" that could destroy aircraft attempting supersonic speeds. Since then, aircraft and missile designs have routinely broken the sound barrier, achieving speeds of Mach 1 and beyond.
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Challenges of breaking the sound barrier
Breaking the sound barrier refers to an aircraft exceeding the speed of sound, typically around 767 miles per hour (1,235 kilometres per hour) at sea level. This speed varies depending on factors such as altitude, temperature, and air pressure. The term “sound barrier” was coined during World War II when pilots of high-speed fighter aircraft experienced a range of adverse aerodynamic effects that hindered further acceleration, making it seem like there was a physical "wall" that prevented faster speeds.
Aerodynamic Drag: As an aircraft approaches the speed of sound, it encounters a significant increase in aerodynamic drag, which acts as a “barrier” to further acceleration. This drag is caused by the formation of strong local shock waves on the wings and body of the aircraft. These shock waves can also lead to a loss of lift, making the aircraft challenging to control.
Turbulence and Stability: The interaction of airflow between the wings and tail surfaces at high speeds can cause severe buffeting and stability issues. Aircraft not designed for supersonic flight may face serious difficulties in maintaining control and recovering from dives at speeds approaching Mach 1.
Compressibility: Compressibility refers to the compression of air around the aircraft as it accelerates. This compression results in a rapid increase in temperature due to the forced proximity of air molecules. Pilots and engineers must consider the impact of this temperature rise on the structural integrity of the aircraft and the performance of its engines.
Sonic Boom: When an aircraft surpasses the speed of sound, it generates shock waves that propagate outward in a cone-shaped pattern. These shock waves, known as a sonic boom, produce a loud, thunderous sound when they reach the ground. The sonic boom is not a one-time occurrence but persists as long as the aircraft remains supersonic. It can startle people on the ground and even cause minor structural damage, which is why civilian aircraft are generally prohibited from supersonic speeds over populated areas.
Instrumentation and Data: During and after World War II, aircraft designers and aerodynamicists considered Mach 0.7 as a limit beyond which it was dangerous to exceed. Early attempts to break the sound barrier were hindered by inaccurate airspeed indicators (ASIs) that produced erroneous readings at high speeds due to compression effects.
These challenges required innovative aircraft designs, such as the Bell X-1, which featured thinner, more swept-back wings to reduce drag and manage shock waves, as well as advanced flight control systems to maintain stability during supersonic flight.
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History of breaking the sound barrier
The idea of a "sound barrier" emerged during World War II, when pilots of high-speed fighter aircraft experienced a range of adverse aerodynamic effects that seemed to impede flight at speeds close to the speed of sound. Mach is the unit of measurement for the speed of sound, and Mach 1 refers to the speed of sound itself.
During WWII, rocketry and artillery experts' products routinely exceeded Mach 1, but aircraft designers and aerodynamicists believed Mach 0.7 was a limit too dangerous to exceed. There were several claims that the sound barrier had been broken during WWII, but these were mostly dismissed as instrumentation errors.
In 1933, Soviet designers working on ramjet concepts fired phosphorus-powered engines out of artillery guns, achieving speeds of up to Mach 2. The German V-2 ballistic missile became the first missile to break the sound barrier in flight on 3 October 1942, achieving Mach 4 by September 1944.
In 1942, the United Kingdom's Ministry of Aviation began a top-secret project with Miles Aircraft to develop the world's first aircraft capable of breaking the sound barrier. This resulted in the development of the prototype Miles M.52 turbojet-powered aircraft, designed to reach 1,000 mph. However, the United States reneged on an agreement to exchange research with the UK, and the project did not achieve its goal.
The first crewed supersonic flight took place on 14 October 1947, piloted by Air Force Captain Charles "Chuck" Yeager in the Bell X-1 rocket-powered aircraft. The aircraft reached Mach 1.06 (about 700 miles per hour) and experienced a smooth transition to supersonic flight. This flight dispelled the belief that an invisible "barrier" could destroy aircraft attempting supersonic flight. Yeager continued to fly experimental aircraft and acted as a flight consultant for the Air Force until his last flight in 1997.
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Frequently asked questions
The sound barrier is a sharp rise in aerodynamic drag that occurs when an aircraft approaches the speed of sound.
Mach 1 is the speed of sound. At sea level and 68 degrees Fahrenheit, the speed of sound is approximately 767 mph (343 meters per second).
Breaking the sound barrier means exceeding Mach 1, or the speed of sound.
The first piloted supersonic flight took place on October 14, 1947, and was piloted by Air Force Captain Charles "Chuck" Yeager in the Bell X-1.
A sonic boom is a shock wave that occurs when an aircraft moves faster than the speed of sound, resulting in a sudden release of pressure waves.
