GAU-8 Avenger

The General Electric GAU-8/A Avenger is a 30 mm hydraulically driven seven-barrel Gatling-style autocannon that is typically mounted in the United States Air Force's Fairchild Republic A-10 Thunderbolt II. Designed specifically for the anti-tank role, the Avenger delivers very powerful rounds at a high rate of fire. The GAU-8/A is also used in the Goalkeeper CIWS ship weapon system, which provides defense against short-range threats such as highly maneuverable missiles, aircraft, and fast maneuvering surface vessels. The GAU-8/A is currently produced by General Dynamics.

GAU-8/A Avenger
The GAU-8/A Avenger's barrel and breech assembly
(ammunition drum off right edge of photo).
TypeGatling-style autocannon
Place of originUnited States
Service history
In service1977–present
Used byUnited States Air Force (Avenger)
Various navies (Goalkeeper)
Production history
DesignerGeneral Electric
ManufacturerGeneral Electric
General Dynamics
Produced1977–present
VariantsGAU-12/U Equalizer
GAU-13/A
Specifications
Mass619.5 lb (281 kg)
Barrel length90.5 in (2.30 m)
Cartridge30×173 mm
Caliber30 mm
Barrels7-barrel (progressive RH parabolic twist, 14 grooves)
ActionElectrically controlled, hydraulic-driven
Rate of fire3,900 rpm (variable)[1][2]
Muzzle velocity3,324 ft/s (1,010 m/s) (API)
Effective firing range4,000 feet (1,220 m)
Maximum firing rangeOver 12,000 feet (3,660 m)
Feed systemLinkless feed system

History

The GAU-8 was created as a parallel program with the A-X (or Attack Experimental) competition that produced the A-10. The specification for the cannon was laid out in 1970,[3] with General Electric and Philco-Ford offering competing designs. Both of the A-X prototypes, the YA-10 and the Northrop YA-9, were designed to incorporate the weapon, although it was not available during the initial competition; the M61 Vulcan was used as a temporary replacement. Once completed, the entire GAU-8 assembly (correctly referred to as the A/A 49E-6 Gun System)[4] represents about 16% of the A-10 aircraft's unladen weight. Because the gun plays a significant role in maintaining the A-10's balance and center of gravity, a jack must be installed beneath the airplane's tail whenever the gun is removed for inspection in order to prevent the aircraft from tipping rearwards.

GAU-8 closeup

The gun is mounted slightly to the port side so that the active firing cannon barrel is at the 9 o'clock position and on the aircraft's center line, with the front landing gear positioned to the starboard side. The gun is loaded using Syn-Tech's linked tube carrier GFU-8/E 30 mm Ammunition Loading Assembly cart. This vehicle is unique to the A-10 and the GAU-8.[5]

The A-10 with its GAU-8/A gun entered service in 1977. It was produced by General Electric, though General Dynamics Armament and Technical Products has been responsible for production and support since 1997 when the division was sold by Lockheed Martin to General Dynamics.[4]

Design

The GAU-8 itself weighs 620 pounds (280 kg), but the complete weapon, with feed system and drum, weighs 4,029 pounds (1,828 kg) with a maximum ammunition load. It measures 19 ft 5 1⁄2 in (5.931 m) from the muzzle to the rearmost point of the ammunition system, and the ammunition drum alone is 34.5 inches (88 cm) in diameter and 71.5 inches (1.82 m) long.[6] Power for operating the gun is provided by twin hydraulic motors pressurized from two independent hydraulic systems. The magazine can hold 1,174 rounds, although 1,150 is the typical load-out. Muzzle velocity when firing armor-piercing incendiary rounds is 1,013 m/s, almost the same as the substantially lighter M61 Vulcan's 20 mm round, giving the gun a muzzle energy of just over 200 kilojoules.[7]

30x173mm round next to a .30-06 Springfield for comparison

The standard ammunition mixture for anti-armor use is a five-to-one mix of PGU-14/B Armor Piercing Incendiary, with a projectile weight of about 14.0 oz (395 grams or 6,096 grains) and PGU-13/B High Explosive Incendiary (HEI) rounds, with a projectile weight of about 13.3 oz (378 grams or 5,833 grains).[8] The PGU-14/B's projectile incorporates a lightweight aluminum body, cast around a smaller caliber depleted uranium penetrating core.[9] The Avenger proved lethal when tested against M47 Patton tanks in 1979.[10]

An innovation in the design of the GAU-8/A ammunition is the use of aluminum alloy cases in place of the traditional steel or brass.[11] This alone adds 30% to ammunition capacity for a given weight. The projectiles incorporate a plastic driving band to improve barrel life. The cartridges measure 11.4 inches (290 mm) in length and weigh 1.53 pounds (0.69 kg) or more.[6][11]

GAU-8 mounted in A-10

The Avenger's rate of fire was originally selectable, 2,100 rounds per minute (rpm) in the low setting, or 4,200 rpm in the high setting.[1] This rate was later changed to a fixed rate of 3,900 rpm.[2] At this speed it would take 18 seconds of sustained fire to empty the magazine. In practice, the cannon is limited to one and two-second bursts to avoid overheating and conserve ammunition; barrel life is also a factor, since the USAF has specified a minimum life of at least 20,000 rounds for each set of barrels.[12] There is no technical limitation on the duration the gun may be continuously fired, and a pilot could potentially expend the entire ammunition load in a single burst with no damage or ill effects to the weapons system itself. However, this constant rate of fire would shorten the barrel life considerably and require added barrel inspections and result in shorter intervals between replacement.

Each barrel is a very simple non-automatic design having its own breech and bolt. Like the original Gatling gun, the entire firing cycle is actuated by cams and powered by the rotation of the barrels.[11] The seven-barrel carriage assembly itself is driven by the aircraft's dual hydraulic system.[12]

The GAU-8/A ammunition feed is linkless, reducing weight and avoiding a great deal of potential for jamming. The feed system is double-ended, allowing the spent casings to be returned to the ammunition drum.[13] Additionally, returning empty cases to the drum has less effect on the aircraft's center of gravity than ejecting them. The feed system is based on that developed for later M61 installations, but uses more advanced design techniques and materials throughout, to save weight.[6]

Accuracy

The GAU-8/A is extremely accurate and can fire up to 3,900 rounds per minute without complications. The 30-mm shell has twice the range, half the time to target, and three times the mass of projectiles fired by guns mounted in comparable close air support aircraft.[14]

The GAU-8/A Avenger Gatling gun next to a Volkswagen Beetle. Removing an installed GAU-8 from an A-10 requires first installing a jack under the aircraft's tail to prevent it from tipping, as the cannon makes up most of the aircraft's forward weight.

The muzzle velocity of the GAU-8/A is about the same as that of the M61 Vulcan cannon, but the GAU-8/A uses heavier ammunition and has superior ballistics. The time of flight of its projectile to 4,000 feet (1,200 m) is 30 percent less than that of an M61 round; the GAU-8/A projectile decelerates much less after leaving the barrel, and it drops a negligible amount, about 10 feet (3.0 m) over the distance.[15] The GAU-8/A accuracy when installed in the A-10 is rated at "5 mil, 80 percent", meaning that 80 percent of rounds fired will hit within a cone with an angle of five milliradians; this equates to a 40-foot (12-meter) diameter circle at the weapon's design range of 4,000 feet (1,200 m).[16] By comparison, the M61 has an 8-milliradian dispersion.[11]

Recoil

Because the gun's recoil forces could push the entire plane off target during firing, the weapon itself is mounted laterally off-center, slightly to the port side of the fuselage centerline, with the actively "firing" barrel in the nine o'clock position (when viewed from the front of the aircraft), so that the firing barrel lies directly on the aircraft's centerline. The firing barrel also lies just below the aircraft's center of gravity, being bore-sighted along a line 2 degrees below the aircraft's line of flight. This arrangement accurately centers the recoil forces, preventing changes in aircraft pitch or yaw when fired. This configuration also leaves space for the front landing gear, which is mounted slightly off-center on the starboard side of the nose.[17]

The GAU-8/A utilizes recoil adapters. They are the interface between the gun housing and the gun mount. By absorbing (in compression) the recoil forces, they spread the time of the recoil impulse and counter recoil energy transmitted to the supporting structure when the gun is fired.

The A-10 engines were initially susceptible to flameout when subjected to gases generated in the firing of the gun. When the GAU-8 is being fired, the smoke from the gun can make the engines stop, and this did occur during initial flight testing.[3] Gun exhaust is essentially oxygen-free, and is certainly capable of causing flameouts of gas turbines. The A-10 engines now have a self-sustaining combustion section. When the gun is fired the igniters come on to reduce the possibility of a flameout.[18]

The average recoil force of the GAU-8/A is 10,000 pounds-force (45 kN),[4][19] which is slightly more than the output of each of the A-10's two TF34 engines of 9,065 lbf (40.3 kN).[20] While this recoil force is significant, in practice a cannon fire burst slows the aircraft only a few miles per hour in level flight.[18]

Variants

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. The Avenger also forms the basis for the Dutch-developed Goalkeeper CIWS naval air-defence gun. No current or contemplated aircraft other than the A-10 carries the full-up Avenger system.[6]

Specifications
A side-view drawing of the GAU-8/A Avenger's mounting location in the A-10's forward fuselage
  • Precision: 80% of rounds fired at 4,000 feet (1,200 m) range hit within a 40-foot (12 m) diameter circle
  • Ammo:
    • PGU-14/B API Armor Piercing Incendiary (DU)
    • PGU-13/B HEI High explosive incendiary
    • PGU-15/B TP Target Practice
  • Armor penetration of Armor-Piercing Incendiary ammunition, BHN-300 RHA, attack angle 30 degrees from vertical:[21]
    • 76  mm at 300 meters
    • 69  mm at 600 m
    • 64  mm at 800 m
    • 59  mm at 1,000  m
    • 55  mm at 1, 220  m

See also

General:

References
  1. Stephens, Rick (1995). A-10 Thunderbolt II. World Air Power Journal. p. 18. ISBN 1-874023-54-9.
  2. Time Compliance Technical Order 1A-10-1089, Flight manual TO 1A-10A-1. 1-150A (Change 8 ed.). United States Air Force. 20 February 2003. p. vi.
  3. "GAU-8/A Avenger". National Museum of the USAF. Archived from the original on 2010-04-16. Retrieved 2009-09-14.
  4. Goebel, Greg (October 1, 2008). "A-10: Development & Description". Archived from the original on 2009-09-25. Retrieved 2009-09-14.
  5. "Turrets & Mounted Weaponry". Zombie survival wiki. Archived from the original on 2009-03-27. Retrieved 2009-09-14.
  6. Spick 2000, p. 44.
  7. "30 mm GAU-8/A Ammunition" (PDF), Defense Systems, Orbital ATK, p. 2, November 2002, archived (PDF) from the original on 2017-02-07, retrieved 2016-05-18
  8. "GAU-8/A Ammunition (30 mm)". ATK. Archived from the original on 2014-01-09. Retrieved 2014-01-09.
  9. Stravonski. "Firepower of the A-10". Archived from the original on 2003-04-15. Retrieved 2009-09-14.
  10. DTIC (PDF), archived (PDF) from the original on 2016-03-04, retrieved 2016-01-25.
  11. Wagner, Jirka. "30mm cannon GAU-8 Avenger". Archived from the original on 2013-01-05.
  12. "Fact Sheet: General Electric GAU-8/A "Avenger" 30mm Cannon". Hill Air Force Base. Archived from the original on 2011-06-04.
  13. "GAU-8 Avenger". Archived from the original on 2005-02-19. Retrieved 2005-04-27.
  14. "A-10/OA-10 Thunderbolt II history". Military systems. Global Security. Archived from the original on 2008-05-16. Retrieved 2008-05-26.
  15. Jenkins 1998, pp. 64–73.
  16. "GAU-8 Avenger". FAS. Archived from the original on 2009-07-14. Retrieved 2009-09-14.
  17. "A-10 Described: GAU-8 Cannon / External Stores". Vectorsite. Archived from the original on 2008-12-25. Retrieved 2008-10-01.
  18. Jenkins, Dennis R (1998). Fairchild-Republic A/OA-10 Warthog. North Branch, Minnesota: Specialty Press. ISBN 1-58007-013-2.
  19. "Armament Systems: Aircraft Gun Systems". General Dynamics Armament and Technical Products. Archived from the original on 6 March 2014. Retrieved 6 March 2014.
  20. "TF34 Engine". Global Security. Archived from the original on 2009-09-06. Retrieved 2009-09-14.
  21. Zecevic, Berko; Terzic, Jasmin; Catovic, Alan; Serdarevic-Kadic, Sabina (April 21, 2010), Dispersion of PGU-14 ammunition during air strikes by combat aircraft A-10 near urban areas, Sarajevo, Bosnia and Herzegovina: University of Sarajevo, Mechanical Engineering Faculty, p. 80.

Bibliography
  • Spick, Michael. The Great Book of Modern Warplanes, Salamander Books, 2000. ISBN 1-84065-156-3.
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