Mason Blake
The sound barrier, or sonic barrier, is the large increase in aerodynamic drag experienced by an aircraft approaching the speed of sound. The term came into use during World War II, when pilots experienced a number of adverse effects that seemed to impede flight at speeds close to the speed of sound. On October 14, 1947, US Air Force Captain Charles E. Chuck Yeager became the first person to break the sound barrier, flying faster than the speed of sound (Mach 1) in the Bell X-1.
| Characteristics | Values |
|---|---|
| Date | 14 October 1947 |
| Pilot | Chuck Yeager |
| Aircraft | Bell X-1 |
| Aircraft type | First US crewed aircraft built to break the sound barrier |
| Aircraft speed | 1,127 kilometres (700 miles) per hour (Mach 1.06) |
| Aircraft altitude | 42,000 feet (13.7 km) |
| Aircraft origin | Air launched from the bomb bay of a Boeing B-29 bomber |
| Aircraft climb | 30-minute climb to 20,000 feet |
| Aircraft climb location | Rogers Dry Lake in the southern California desert |
| Previous claims | George Welch on 1 October 1947; Hans Guido Mutke on 9 April 1945 |
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What You'll Learn
Chuck Yeager breaks the sound barrier
On 14 October 1947, US Air Force Captain Chuck Yeager became the first person to break the sound barrier in level flight. He flew the experimental purpose-built Bell X-1 aircraft, also known as the Glamorous Glennis, at an altitude of 45,000 feet (13.7 km) in the California desert.
The Bell X-1 was the first US crewed aircraft built to break the sound barrier. It was designed with extremely thin yet strong wings and a minutely adjustable horizontal stabilizer to improve control. The fuselage was shaped like a .50-calibre bullet, as high-powered bullets are stable at supersonic speeds.
Yeager's successful flight put to rest the belief that supersonic flight was impossible due to an invisible "barrier" that could destroy aircraft. As Yeager himself later stated:
> "I realized that the mission had to end in a letdown because the real barrier wasn't in the sky but in our knowledge and experience of supersonic flight."
The Bell X-1's ninth powered flight saw the Mach meter jump from Mach 0.965 to Mach 1.06—faster than the speed of sound. The transition to supersonic flight was remarkably uneventful. Yeager cut the power after 20 seconds and glided down to the lakebed for a safe landing. The world's first piloted supersonic flight had lasted 14 minutes from release from the B-29 bomber to landing.
The X-1 program gathered crucial flight data about transonic and supersonic flight, which was directly applied to the next generation of military aircraft, keeping America at the forefront of aeronautical research.
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George Welch's unverified claim
The sound barrier or sonic 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. During World War II, pilots of high-speed fighter aircraft experienced the effects of compressibility, a number of adverse aerodynamic effects that deterred further acceleration, seemingly impeding flight at speeds close to the speed of sound.
During WWII and immediately thereafter, a number of claims were made that the sound barrier had been broken in a dive. The majority of these purported events can be dismissed as instrumentation errors. The typical airspeed indicator (ASI) uses air pressure differences between two or more points on the aircraft to produce a speed figure. At high speed, the various compression effects that lead to the sound barrier also cause the ASI to go non-linear and produce inaccurately high or low readings.
George Welch, a World War II triple ace, a Distinguished Service Cross recipient, and an experimental aircraft pilot, made a plausible but officially unverified claim to have broken the sound barrier on 1 October 1947, while flying an XP-86 North American F-86 Sabre. He also claimed to have repeated his supersonic flight on 14 October 1947, 30 minutes before Yeager broke the sound barrier in the Bell X-1. Although evidence from witnesses and instruments strongly implies that Welch achieved supersonic speed, the flights were not properly monitored and are not officially recognized.
In his book "Aces Wild: The Race for Mach 1" (1998), fellow North American test pilot Al Blackburn speculates that Welch may have broken the sound barrier two weeks before Chuck Yeager in an early flight of the XP-86 prototype. Blackburn based his contention on interviews of eyewitnesses, former North American employees, and access to contemporary historical accounts. However, Robert Kempel, author of "The Race For Mach 1", contradicts the claim, contending that for Welch's aircraft to break the sound barrier with an underpowered engine was impossible. He notes that the XP-86 airframe was capable of transonic flight, but the interim low-power J35-C-3 limited its performance. The late Bob Hoover, chase pilot for Welch and Yeager, had also disputed the Welch story, stating that Welch was not flying that day because his plane was being repaired.
On 26 April 1948, at Muroc Field (now known as Edwards Air Force Base), Welch put the prototype XP-86 Sabre into a 40-degree dive and broke the sound barrier. It was only the second U.S. aircraft to fly supersonic. The first was the Bell X-1, piloted by Chuck Yeager, only a few months earlier.
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Hans Guido Mutke's disputed achievement
On October 14, 1947, US Air Force pilot Chuck Yeager became the first person to officially break the sound barrier, flying the experimental Bell X-1 aircraft at a speed of Mach 1.06 (700 mph) at an altitude of 45,000 feet. This historic flight marked the first time a human had traveled faster than the speed of sound, opening up new possibilities for aviation and aerospace engineering. However, one name that is often overlooked in this narrative is that of Hans Guido Mutke, a German pilot who claimed to have broken the sound barrier earlier that same year.
Hans Guido Mutke was a pilot in the German Luftwaffe during World War II. On April 9, 1945, Mutke was flying a Messerschmitt Me 262 jet fighter on a mission to attack Allied ground forces. During the mission, Mutke claims that he accidentally exceeded the speed of sound in a dive while trying to escape pursuing Allied aircraft. He reported hearing a loud "bang" and feeling a sudden jolt, which he believed indicated that he had broken the sound barrier.
However, Mutke's claim has been disputed by aviation historians and experts for several reasons. First, the Me 262 was not designed for supersonic flight, and there is no concrete evidence to suggest that it was capable of achieving those speeds. Second, Mutke's account of the event has been called into question, as there were no other witnesses to corroborate his story. Additionally, his claims were made several years after the fact, raising further doubts about the accuracy of his recollection.
Another point of contention is the lack of scientific data to support Mutke's claim. While he reported hearing a "bang," this could have been caused by a number of other factors, such as explosive decompression or the shockwave from another aircraft. Without instrumental data or corroborating evidence, it is difficult to verify that Mutke actually broke the sound barrier.
Finally, the context of the war itself casts doubt on Mutke's achievement. The Me 262 was a revolutionary aircraft, but it was introduced too late in the war to have a significant impact. If the Luftwaffe had successfully broken the sound barrier, it is unlikely that this major technological advancement would have been kept secret, especially given the potential military advantages it could have conferred.
In conclusion, while Hans Guido Mutke's claim of breaking the sound barrier adds an intriguing twist to the story of supersonic flight, it remains a disputed achievement. The lack of concrete evidence, the limitations of the Me 262 aircraft, and the circumstances of the war all contribute to the skepticism surrounding his account. Nonetheless, Mutke's claim continues to fuel debates and discussions among aviation enthusiasts and historians alike, serving as a reminder of the complexity and intrigue surrounding this pivotal moment in aviation history.
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The sound barrier defined
The sound barrier, or sonic barrier, refers to the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or other object when it approaches the speed of sound. This phenomenon creates a barrier to flying faster, making it very difficult or seemingly impossible to exceed the speed of sound. The term sound barrier is still used to refer to aircraft approaching supersonic flight in this high-drag regime.
During World War II, pilots of high-speed fighter aircraft experienced the effects of compressibility, which caused a number of adverse aerodynamic effects that deterred further acceleration and seemed to impede flight at speeds close to the speed of sound. In dry air at 20°C (68°F), the speed of sound is 343 meters per second (about 767 mph, 1234 km/h, or 1,125 ft/s).
As aircraft approached the speed of sound, they encountered severe aerodynamic buffeting, which threatened the success of early attempts at supersonic flight. To overcome these dangerous forces, aircraft designed to break the sound barrier featured extremely thin yet strong wings and a minutely adjustable horizontal stabilizer to improve control. The fuselage was shaped like a .50-caliber bullet, as high-powered bullets are stable at supersonic speeds.
During World War II and the period that immediately followed, several claims were made about breaking the sound barrier in a dive. However, most of these purported events were dismissed as instrumentation errors. Accurate measurements of supersonic speeds could only be made remotely, typically using ground-based instruments. Many claims of supersonic speeds were later found to be far below this speed when measured remotely.
In 1947, American test pilot Chuck Yeager demonstrated that safe flight at the speed of sound was achievable in purpose-designed aircraft, breaking the sound barrier on October 14, 1947, in the Bell X-1 aircraft. This flight changed the future of aviation forever, proving that supersonic flight was possible and gathering crucial flight data for the Air Force and aeronautical research.
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Supersonic flight before Yeager
During World War II, pilots of high-speed fighter aircraft experienced the effects of compressibility, a number of adverse aerodynamic effects that deterred further acceleration, seemingly impeding flight at speeds close to the speed of sound. This led to the use of the term "sound barrier". During WWII and the period that immediately followed, several claims were made about breaking the sound barrier in a dive. However, the majority of these purported events can be dismissed as instrumentation errors.
Hans Guido Mutke claimed to have broken the sound barrier on 9 April 1945, in the Messerschmitt Me 262 jet aircraft. He reported speeds of 1,100 kilometres per hour (680 mph) and experiencing transonic buffeting, but his claim is widely disputed, even by pilots in his unit. Tests by Karl Doetsch found that the plane became uncontrollable above Mach 0.86, and at Mach 0.9, it would nose-dive irretrievably.
There is anecdotal evidence that American pilot George Welch may have broken the sound barrier before Yeager, on 1 October 1947, while flying an XP-86 North American F-86 Sabre. He claimed to have repeated this feat on 14 October 1947, 30 minutes before Yeager's historic flight. While evidence from witnesses and instruments strongly implies that Welch achieved supersonic speed, the flights were not properly monitored and are not officially recognized.
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Frequently asked questions
Chuck Yeager broke the sound barrier in the Bell X-1.
Chuck Yeager broke the sound barrier on October 14, 1947.
The aircraft reached 1,127 kilometers (700 miles) per hour (Mach 1.06).
The aircraft climbed to a test altitude of 42,000 feet and began its test run.
Yes, there were multiple claims of people breaking the sound barrier during World War II and immediately after. One such claim was made by German pilot Hans Guido Mutke, who stated that he broke the sound barrier on April 9, 1945, while flying the Messerschmitt Me 262 jet aircraft. However, this claim is widely disputed.
