Nova Zhang
Artillery shells are ammunition fired from weapons such as cannons, howitzers, and mortars. They are designed to travel at high velocities, often exceeding the speed of sound. This speed is known as muzzle velocity, and it depends on factors such as the quantity and quality of propellant, the mass of the projectile, and the length of the barrel. The longer the barrel, the higher the muzzle velocity tends to be. The shape of the projectile and the firing angle also influence its speed. Due to their high velocities, artillery shells can reach their targets before the sound of the firing is audible, leading to the common military belief that one might not hear the shell that kills them.
| Characteristics | Values |
|---|---|
| Are artillery shells faster than sound? | Yes, most artillery shells travel faster than the speed of sound. |
| What is the speed of sound? | 338 meters per second or 759 miles per hour |
| What factors influence the speed of artillery shells? | Firing angle, barrel length, and propellant charge |
| Can you hear an artillery shell before it hits the target? | It depends on the trajectory and distance of the shell. Sometimes, you can hear a thump or a whistle before the shell lands. |
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What You'll Learn
Artillery shells can travel faster than sound
A former 13B Cannon Crew Member on Reddit confirms that shells can leave the tube traveling faster than the speed of sound. However, because they often take a long trajectory to reach the target, you can usually hear the thump of the gun and the whistle of the shell as it cuts through the air. The sound may be like the wind rushing or a deep hiss.
The type of round can also make a difference. For example, the terminal velocity of 155mm howitzer shells is usually under the speed of sound, at 338 meters per second. However, with higher propellant charges and shorter ranges, the velocity can reach supersonic speeds.
The angle of firing also affects the speed of the shell. For instance, with high-angle fire, where the cannon elevation is above 45 degrees, the terminal velocity gradually rises back to 338 m/s as the projectile falls back to earth.
It is worth noting that even if the shell is faster than sound, the shock wave from the explosion it creates will likely reach you before the sound of the shell itself.
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The sound of artillery shells whistling
Artillery shells are designed to travel at speeds greater than that of sound, ensuring that the target is hit before the sound reaches their ears. This means that the sound produced by artillery shells is often described as a whistling or whining noise, similar to the wind rushing by a small aircraft or the tires of an automobile on pavement. This whistling sound is caused by the high-speed passage of the shell through the air, creating a unique acoustic signature.
The whistling sound of artillery shells can be heard by individuals in the vicinity, depending on the firing angle and trajectory of the shell. If the shell is fired at a high angle, the sound may take a shorter path, reaching the target almost simultaneously with the shell itself. In such cases, the whistling sound may be drowned out by the explosion or perceived as a crackling noise shortly after the impact.
However, when the firing angle is lower, individuals within the range of the artillery shell may hear the distinct whistling sound as the shell cuts through the air. This sound is often described as a decreasing whistle, becoming deeper as the shell approaches. The trajectory of the shell also plays a role in the perception of the whistling sound, with longer arcs resulting in subsonic speeds by the time the shell reaches its target.
The whistling noise produced by artillery shells is not just a harmless acoustic phenomenon. It carries important information that trained military personnel can use to assess the situation. By listening to the sound, they can determine the type of projectile, such as differentiating between howitzer projectiles based on their unique acoustic signatures. This critical skill can provide valuable seconds to react and take appropriate actions, such as seeking cover or returning fire.
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Artillery shell speed depends on barrel length
Artillery shells are usually faster than sound. However, the speed of an artillery shell depends on several factors, including the type of firearm, the cartridge, and the barrel length.
The barrel length of a gun determines the muzzle velocity of a projectile. The muzzle velocity of a firearm is the speed of a projectile with respect to the muzzle at the moment it leaves the end of the gun's barrel. Longer barrels generally provide higher velocities, as they give the propellant force more time to work on propelling the projectile.
Rifled barrels, which have spiral twists carved inside them to spin and stabilise the bullet in flight, benefit from longer barrel lengths. This is because longer barrels provide more opportunity to rotate the bullet before it leaves the gun. Additionally, longer barrels make it easier to aim using iron sights due to the longer sight radius.
The barrel length also affects the weight of the firearm. For example, cannons, which have longer barrels, are heavier than howitzers.
Innovations such as wing attachments and special powder cartridges can also increase the speed of an artillery shell.
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Artillery shell velocity and elevation
Artillery shells are often designed to travel at supersonic speeds. This means that they travel faster than the speed of sound, and the area targeted will be hit before the sound of the shell travelling through the air reaches people's ears.
The velocity and elevation of an artillery shell are influenced by a variety of factors, including the muzzle velocity, the angle of elevation, the shape and weight of the shell, the spin rate, and the density of the atmosphere. The muzzle velocity is the speed at which the shell leaves the barrel of the gun, and it can vary due to factors such as powder temperature and barrel erosion. The angle of elevation, or firing elevation angle, is the angle at which the gun is fired, and it affects the trajectory and range of the shell. The shape and weight of the shell also play a role in its velocity and elevation, with heavier shells tending to travel further, and the drag coefficient varying with the shape and size of the shell.
The rate of spin, or revolutions per second, of the shell decreases with velocity and affects its stability during flight. Additionally, the density of the atmosphere varies with altitude, which means that altering the elevation angle can result in the shell travelling through different air resistance levels. These factors are taken into account when calculating the trajectory needed to hit a target, and corrections are made for variations in ballistic conditions.
For example, land-based artillery can achieve greater range by firing at angles higher than 45 degrees, and the velocity nadir for a shell is at an elevation of 26 degrees. At this angle, the shell will attain a peak altitude of 14,730 feet. The velocity and elevation of artillery shells are carefully calculated to ensure accuracy and maximize the effectiveness of the weapon.
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Artillery shells and nerve conduction speed
Artillery shells are large-calibre projectiles fired from artillery, tanks, assault guns, mortar carriers, warships, autocannons, and other similar weapons. They are differentiated by how they are loaded and propelled, and the type of breech mechanism. The speed of an artillery shell is determined by the kinetic energy of the projectile or the explosive charge in it.
Most artillery shells travel faster than the speed of sound. This means that the target is hit before the sound reaches their ears. In such cases, the shock wave of the explosion would kill the target before they hear the blast.
However, some artillery shells may be fired at a low enough firing angle that they travel at a subsonic speed. In these cases, the target may hear the thump of the gun and the whistle of the shell as it passes through the air.
It is important to note that injuries and death can occur faster than the rate of nerve conduction. Therefore, even if the target hears the sound of the shell, they may not be able to react and move out of the way quickly enough to avoid injury or death. The speed of nerve conduction is the rate at which nerve impulses are transmitted, which varies depending on the nerve fibre and the temperature.
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Frequently asked questions
Yes, most artillery shells travel faster than the speed of sound.
The speed of sound is 338 meters per second or 751.3mph.
Artillery shells leave the tube when fired at a speed faster than the speed of sound. However, because of their long trajectory to the target, they often slow to subsonic speeds before they land.
You can usually hear the thump of the gun and the whistle of the shell even if it lands very close to you.
