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The GAU-22/A's major difference is the use of four barrels, rather than the GAU-12/U's five barrels. The GAU-22/A is lighter and has a reduced rate of fire of 3,300 rounds per minute, but maintains the same, high accuracy of 5 milliradians , 80% circle [ 2 ] of the GAU-12 [ 3 ] and A-10's GAU-8. [ 4 ]
Some of the GAU-8/A technology has been transferred into the smaller 25 mm GAU-12/U Equalizer, which was developed for the AV-8B Harrier II aircraft. The GAU-12 is about the same size as the 20 mm M61. GE has also developed the GAU-13/A, a four-barreled weapon using GAU-8/A components, which has been tested in podded form as the GPU-5/A.
English: The General Dynamics GAU-12/U Equalizer: a five-barrel 25 mm Gatling gun-style rotary cannon used by the United States, Italy and Spain, mounted in their fighter jets such as the AV-8B Harrier II, airborne gunships such as the Lockheed AC-130, and land-based fighting vehicles.
GAU-12 Equalizer – General Electric, 25 mm caliber; GAU-13 – General Electric, 30 mm caliber; GAU-19 – General Electric, 12.7×99 mm caliber; GAU-22 – General Dynamics, 25 mm caliber, 4-barrel version of the GAU-12 mounted internally in the F-35A and in external gun pods on the F-35B and F-35C; GAU-8 Avenger – General Electric, 30 mm ...
The GAU-19/A is designed to accept standard NATO .50 caliber M9-linked ammunition. The rate of fire is selectable to be either 1,000 or 2,000 rounds per minute. The Humvee armament kit version fires at 1,300 rounds per minute. The average recoil force when firing is 382 lb/ft, 495 lb/ft or 629 lb/ft depending on firing rate.
It has a cyclic rate of fire of 730+-50 rounds per minute. Standard practice is to fire the cannon in 30- to 50-round bursts. With extended automatic firing from a hover, the recoil is sufficient that the application of forward cyclic to maintain one's position over the ground is inadequate.
The 4 percent rule was popularized in a landmark 1998 research report known as the “Trinity study,” which analyzed past market performance to determine a safe withdrawal rate in retirement.
The U.S. Marine Corps uses DU in the 25 mm PGU-20 round fired by the GAU-12 Equalizer cannon of the AV-8B Harrier, and also in the 20 mm M197 gun mounted on AH-1 Cobra helicopter gunships. The United States Navy 's Phalanx CIWS 's M61 Vulcan Gatling gun used 20 mm armor-piercing penetrator rounds with discarding plastic sabots and a core made ...