Gatling gun
From Wikipedia, the free encyclopedia
A Gatling gun is a gun with multiple firing pins and breeches connected to multiple rotating barrels. Each barrel fires a single shot as it reaches a certain point in the cycle after which it ejects the spent cartridge, loads a new round, and in the process, somewhat cools down. This configuration allows higher rates of fire without the problem of an overheating single barrel, though accuracy suffers. The gun was designed by the American inventor Dr. Richard J. Gatling in 1861 and patented in 1862.
The Gatling gun may have been the first "machine gun" because, while it did not automatically reload under its own power, it was capable of firing continuously. The first Gatling gun relied on a hand crank for external power. Some time later, Gatling-type weapons diverted a fraction of gas from the chamber to spin the rotating barrels. Later still, electric motors supplied external power.
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[edit] History
The original Gatling gun was a black powder field weapon, which used multiple rotating barrels turned by a hand crank, and firing loose (no links or belt) metal cartridge ammunition using a gravity feed system from a hopper. It was first used by the Union Army during the American Civil War. Unlike earlier weapons such as the mitrailleuse which had limited capacity and long reloading times, the Gatling gun was more reliable, easy to load, and had a high firing rate. Gatling guns were used by the US side during the Spanish-American War, most notably during the battle of San Juan Hill.[1]
[edit] Modern Gatling-style guns
After Gatling guns were replaced by lighter, cheaper blowback-style weapons, the approach of using multiple rotating barrels fell into disuse for many decades. However, Gatling gun-style weapons made a return in the 1940–50s, when weapons with very high rates of fire were needed in military aircraft. For these modern weapons, electric motors are used to rotate the barrel, although, systems that derive power from their ammunition do exist such as the GSh-6-23 which uses a gas-operated drive system.
One of the main reasons for the resurgence of the Gatling gun-style design is the weapon's tolerance for continuous high rates of fire. For example, if 500 rounds were fired at a high rate from a conventional single-barrel weapon, this would likely result in the barrel overheating (distorting in extreme cases) or a weapon jam. In contrast, a five-barreled Gatling gun-style weapon firing 500 rounds, only fires 100 rounds per barrel, an acceptable rate of fire. Ultimately the limiting factor is the rate at which loading and extraction can occur. In a single barrel design these tasks must alternate, a multiple barrel design on the other hand lets them occur simultaneously, with different barrels at different points in the cycle. Their high rate of fire also makes them useful in systems that have little time to engage their targets, such as CIWS which defend against fast-moving anti-ship missiles.
The M61 Vulcan 20 mm cannon is the most prolific member of a family of weapons designed by General Electric and currently manufactured by General Dynamics. It is a six-barreled rotary cannon capable of more than 6,000 rounds per minute. Similar systems are available ranging from 5.56 mm to 30 mm (there was even a 37 mm Gatling on the prototype T249 'Vigilante' AA platform); the rate-of-fire being somewhat inversely-proportional to the size and mass of the ammunition (which also determines the size and mass of the barrels).
Another Gatling design well-known among aviation enthusiasts is the GAU-8 Avenger 30 mm cannon, carried on the A-10 Thunderbolt II (Warthog) attack aircraft. It is a seven-barreled cannon designed for tank-killing and is currently the largest bore Gatling weapon active in the U.S. arsenal.
During the Vietnam War, the 7.62 mm caliber M134 Minigun was created as a helicopter weapon. Able to fire 6,000 rounds per minute from a 4,000-round linked belt, the Minigun proved to be one of the most effective non-explosive projectile weapons ever built and is still used in helicopters today.
They are also used with lethal effectiveness on USAF AC-47, AC-119 and Lockheed AC-130 gunships, their original high-capacity cargo airframes able to house the items needed for sustained operation. With sophisticated navigation and target identification tools, Miniguns can be used effectively even against concealed targets. The crew's ability to concentrate the Gatling's fire very tightly produces the appearance of the 'Red Tornado'[2] from the light of the tracers, as the gun platform circles a target at night.
[edit] References
[edit] See also
[edit] External links
- List of Military Gatling & Revolver cannons
- U.S. Patent 36,836 -- Gatling gun
- U.S. Patent 47,631 -- improved Gatling gun
- U.S. Patent 112,138 -- revolving battery gun
- U.S. Patent 125,563 -- improvement in revolving battery guns
- "Colt 30 Cal Gatling Gun Model 1900 Army" drawings
- Description of operating principle (with animation) from HowStuffWorks
- CGI animated GAU-17/A
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