What Happens When You Break the Sound Barrier

Summary

Highlights

• Witnessing a sonic boom is an incredibly impressive experience! 🌟
• It all begins when an aircraft flies faster than the speed of sound, creating a sonic boom! 🚀
• The remarkable Chuck Yeager was the first person to break the sound barrier on October 14, 1947. 👨‍✈️
• Innovations in technology allow us to keep breaking boundaries while staying safe. 🤖
• Sonic booms significantly impact the environment and people's daily lives! 🌍

Key Takeaways

• Witnessing a sonic boom is a breathtaking experience! 🌟
• Aircraft traveling faster than sound create a pressure wave, known as a sonic boom! 🚀
• Chuck Yeager was the trailblazer who first crossed the sound barrier. 👨‍✈️
• Modern technology continues to push boundaries safely. 🤖
• Sonic booms can affect our environment significantly! 🌍

Overview

Chapters

• 00:00 - 01:00: Introduction to Sonic Boom The chapter introduces the concept of a sonic boom, describing the experience of seeing an aircraft approaching at Mach speed without initially hearing any sound from it. As the aircraft gets closer, despite visible flames from the jet and movement of the trees below, there remains silence until it passes overhead, resulting in a sudden pressure increase and a loud boom. This phenomenon, known as a sonic boom, is explained through the described scenario.
• 01:00 - 03:00: History of Breaking the Sound Barrier This chapter explores the history and significance of breaking the sound barrier. It begins by explaining Mach 1, which represents the speed of sound, and discusses the phenomenon known as a sonic boom that occurs when an object travels faster than the speed of sound. The chapter raises a question about the dangers associated with sonic booms. The narrative highlights a historical milestone achieved on October 14, 1947, when Captain Chuck Yeager, a U.S. Air Force pilot, became the first individual to travel faster than the speed of sound. This event marked the culmination of extensive efforts by the military to break the sound barrier.
• 03:00 - 05:00: How Sonic Boom Occurs The chapter discusses the challenges faced by early aircrafts as they approached the speed of sound, resulting in severe turbulence that sometimes led to catastrophic failures. It highlights the dangerous build-up of pressure around the aircraft, causing violent shaking. This phenomenon led to the belief that the sound barrier was impenetrable, until Chuck Yeager's successful attempt to break it, proving it possible.
• 05:00 - 07:00: Factors Affecting Sonic Boom The chapter discusses the factors affecting sonic boom, exemplified by Chuck Yeager's flight in the Bell X-1 aircraft, 'Glamorous Glennis.' The aircraft was carried to 25,000 feet by a B-29, then released to reach 40,000 feet, breaking the sound barrier due to Yeager's piloting and aerodynamic enhancements made to the X-1, which ensured stability and speed, surpassing 662 miles per hour.
• 07:00 - 10:00: Impact and Examples of Sonic Boom The chapter delves into the phenomenon of sonic booms, using the analogy of a boat traveling through water to explain how sound waves behave like ripples. It describes the transition of an aircraft to supersonic speeds, where it begins to move faster than the sound waves it generates, resulting in a sonic boom.
• 10:00 - 13:00: Sonic Boom Phenomena The chapter explains the concept of sonic booms, which occur when an aircraft travels at Mach speeds. It remains silent until it has passed overhead because a sonic boom results from the sudden change in pressure between the front and tail of the aircraft, producing a shockwave. This shockwave is not from a single point but forms a cone shape called the Mach cone. Anyone located within this Mach cone area will hear the sonic boom, even if the aircraft does not fly directly above them.

What Happens When You Break the Sound Barrier Transcription

• 00:00 - 00:30 You look up into the sky and see an  aircraft flying towards you at Mach speed.   Everything is silent as the plane approaches.  You expected to be able to hear the roar of   its engines as it got closer, but this is not the  case. You look through a pair of binoculars at the   object and can see the flames from the jets coming  out of the back, yet there is still no sound. When   you glance down at the trees below the plane, it  seems as if some unseen force is bending them.   The supersonic jet passes over you. There is a  sudden increase of pressure and a deafening boom! You just experienced a sonic boom  from the aircraft that flew over you.
• 00:30 - 01:00 Mach 1 means that an object is  traveling at the speed of sound.   Anything over Mach 1 means an object is going  faster than the speed of sound and will create a   sonic boom. The loudness and intensity of this  phenomenon is determined by several factors. But what is a sonic boom, and what actually  causes it? Or perhaps a better question is:   what are the dangers of standing  in the path of a sonic boom? On October 14, 1947, U.S. AirForce pilot Captain  Chuck Yeager was the first person to travel faster   than the speed of sound. For years the military  had been trying to break the sound barrier,
• 01:00 - 01:30 but every aircraft that approached the speed  of sound experienced intense turbulence. The   aircraft would shake so violently that some were  torn apart, costing the lives of several pilots. The problem was that as an aircraft approached  the speed of sound, there would be a build-up   of pressure pushing on the plane from all sides.  The vessel would then begin shaking violently,   which would continue until the pilot slowed  down. This led many to assume that the sound   barrier was something that humans  were just not meant to get past. But Chuck Yeager proved them wrong. On a sunny  October day, Chuck Yegar was strapped into his
• 01:30 - 02:00 bright orange Bell X-1 aircraft named “Glamorous  Glennis” after his wife. The X-1 was loaded onto   a B-29 and flown to an altitude of 25,000 feet  above Dry Lake, California. The X-1 was released   through the bomb bay doors and rocketed to 40,000  feet at over 662 miles per hour. This meant Yeager   was traveling faster than the speed of sound at  that altitude. It was a combination of Yeager’s   piloting skills and modifications made to the X-1  that allowed it to be more aerodynamic and stable
• 02:00 - 02:30 during the turbulence that allowed humans  to achieve their first supersonic flight. But what does this actually mean? A good way to think about the concept of sonic  booms is to imagine that air is a fluid. When   a boat travels through water, it creates ripples  that radiate outward from the front of the boat.   The same thing happens with a plane in the air.  As an aircraft travels through the air, the sound   waves it generates radiate out in a similar  way to ripples in water from a moving boat. However, when an aircraft goes supersonic or  exceeds the speed of sound, it means that the   plane is moving faster than the soundwaves it  is creating. This is why an aircraft that is
• 02:30 - 03:00 approaching you at Mach speeds appears to  be silent until it passes over you. This   phenomena results in a sudden change of pressure  between the front and tail of the aircraft,   which results in a shockwave or what we  call a sonic boom. But a sonic boom is   not just generated at a single point. It is  actually a cone shape called the Mach cone. Anyone within the area of the Mach cone will  experience the sonic boom of an aircraft going   faster than the speed of sound. So, the plane  does not need to fly directly above you. The
• 03:00 - 03:30 sonic boom is not the noise of the jet engines  or the object itself; it is actually the sharp   release of pressure that occurs between the  built-up shockwave in front of the aircraft   that collapses into the space the aircraft  previously occupied as it moves through the air. An easier way to think of it is that due to the  natural forces of physics, the incredibly high   pressure that builds up in front of the plane  wants to fill in the space that the aircraft   occupies. A simplified example of this can be  seen when you wave your hand back and forth.   You can feel the air “move” over your  hand. This is because as your hand moves,
• 03:30 - 04:00 the air molecules around it flow over your hand to  fill the empty space that your hand once occupied. This all has to do with changes in pressure;  the space where your hand was has a lower   concentration of air molecules than the  surrounding area. This causes the molecules   to flow towards the area of low concentration  in order to equalize the pressure. If you could   move your hand at 761 miles per hour, you  would create a mini sonic boom as your hand   moved through the air. The same thing happens  when an aircraft reaches supersonic speeds.
• 04:00 - 04:30 The build-up of pressure at the front of the  plane instantly fills the space behind the tail   of the plane where the aircraft was a moment  before. This is what causes the sonic boom. The size and distance of the sonic boom created  by the Mach cone is influenced by several factors.   Things like the weight, size, and shape of the  aircraft all impact the sonic boom's intensity.   Also, the speed, altitude, and flight path the  aircraft takes will affect the Mach cone. A large,   heavy aircraft will displace a lot  more air than a thin, small aircraft.   This means that the larger aircraft’s sonic  boom will be much stronger and louder.
• 04:30 - 05:00 The more air displaced by an  object going supersonic speeds,   the bigger and stronger the sonic boom  will be when the pressure change occurs.   Altitude also plays an important factor in how  intense a sonic boom is. The higher a supersonic   aircraft is flying, the wider the area of the  Mach cone will be. This is because the shock   wave needs to travel a further distance to reach  the surface of the Earth than a low-flying object. However, altitude also influences the speed at  which sound moves. At sea level, the speed of   sound is around 761 miles per hour. This means  any object that travels faster than that speed
• 05:00 - 05:30 will break the sound barrier. The record for  fastest land speed is held by Andy Green, who   drove a Thrust SSC 763 miles per hour, breaking  the sound barrier by just over 2 miles per hour. When the Concorde was still in operation, it  flew passengers across the Atlantic at about   55,000 feet above sea level. At this altitude the  sound barrier is approximately 660 miles per hour,   almost 100 miles per hour slower than at sea  level. Both created sonic booms when they
• 05:30 - 06:00 passed the sound barrier, but the Thrust SCC  needed to travel much faster than the Concord   to achieve this phenomenon  due to its lower elevation. The area within a Mach cone where the sonic  boom can be heard is called the boom carpet.   Researchers can calculate the exact dimensions  of the boom carpet to know how much area will   be affected by the sonic boom of an aircraft  flying overhead. The width of the boom carpet   is about one mile for every 1,000 feet of  altitude. This means that if a supersonic   jet is flying at 60,000 feet, its boom  carpet will be about 60 miles in width.
• 06:00 - 06:30 That being said, not all points within the boom  carpet will experience the same intensity of   shock waves. The spot directly beneath the  aircraft will have the highest intensity   and experience the most powerful sonic  boom. The further away someone is from   the flight line of an aircraft, the  less intense the sonic boom will be. Any object traveling faster than the  speed of sound actually generates   two sonic booms. This is because  there are two changes in pressure   as an object travels quickly through the  air. The first is at the front of the plane,   where a huge amount of pressure builds up  around the nose. The second is at the tail of
• 06:30 - 07:00 the aircraft, where the pressure suddenly returns  to normal. The two sonic booms are normally about   the same strength. The time between the two is  dependent only on how large the aircraft is. The longer and bulkier a plane is, the more  time there will be between the two sonic booms.   Conversely, if an aircraft is small and thin,  the time between the two sonic booms will be   so short that it may seem like there  is just a single shockwave. However,   this is just an illusion as every aircraft  going over Mach 1 creates two sonic booms.
• 07:00 - 07:30 A good example of this phenomenon occurred when  NASA used to utilize space shuttles for their   missions. During reentry, the shuttles would be  traveling much faster than the speed of sound.   Since these crafts were so large, the time  between the two sonic booms was very noticeable. Interestingly, speed doesn’t have as much of  an effect on the intensity of a sonic boom as   you might think. The faster an aircraft goes over  Mach 1 does not necessarily correlate to a bigger   sonic boom. At speeds slightly faster than Mach  1, like Mach 1.3, there is a significant increase   in the power of a sonic boom. However, at speeds  faster than Mach 1.3, the change in the intensity
• 07:30 - 08:00 of a sonic boom is negligible. On the other  hand, the maneuvers an aircraft makes while   traveling at supersonic speeds can have a huge  impact on its shockwave. Maneuvers like an “S”   turn can significantly increase the intensity of  a sonic boom due to a greater buildup of pressure. Currently, supersonic aircraft are restricted  from flying over populated areas due to the   effects sonic booms can have on people, animals,  and structures. During the time that the Concorde   was being used, people who lived along  the flight paths would complain about
• 08:00 - 08:30 the disruptions the sonic booms had on their  daily lives. The sonic booms from these jets   passing overhead would startle people and were  even connected to increased levels of anxiety. In unique circumstances, the sonic booms from  the Concords could even cause hearing loss.   Therefore, aircraft that fly above Mach 1  take routes that are away from populated areas   or decrease their speeds when  above land inhabited by people. It is important to note that sonic booms  are measured in pounds per square foot   because they are the result of a change in  pressure and not the loudness of a sound.
• 08:30 - 09:00 A Concorde SST flying Mach 2 at 52,000  feet generates a sonic boom of 1.94 psf.   This is enough to cause mild discomfort for  someone standing directly below the aircraft   and could even result in minor damage to  structures, such as the cracking of glass. Now watch “The Supersonic Submarine  - New Secret US Army Development?”   Or check out “How US Military  Spy Plane Drove the USSR Crazy.”