Enters 'planegeek mode' .....
The A10 uses an standard Avenger GAU-8 cannon. The GAU-8 itself weighs 281 kg (620 lb), but the complete weapon, with feed system and drum, weighs 1,830 kg (4,029 lb) with a maximum ammunition load. It measures 19 ft ½ in (5.81 m) from the muzzle to the rearmost point of the ammunition system, and the ammunition drum alone is 34.5 in (86 cm) in diameter and 71.5 in (1.82 m) long. (Spick, 2000, p. 44). The magazine can hold 1,350 rounds, although 1,174 is the more normal load-out. Muzzle velocity with armor-piercing incendiary (API) ammunition is 3,250 ft/s (990 m/s), almost the same as the substantially lighter M61 Vulcan's 20mm round.
The standard ammunition mixture for anti-armor use is a four-to-one mix of PGU-14/B Armor-Piercing Incendiary (API), with a projectile weight of about 15.0 oz (425 grams or 6,560 grains) and PGU-13/B High Explosive Incendiary (HEI) rounds, with a projectile weight of about 12.7 oz (360 grams). The PGU-14/B round incorporates a depleted uranium penetrator. The Avenger is lethal against tanks and any other armored vehicle. The use of the depleted-uranium round is controversial, with some reports linking its use to health problems among both survivors of DUP attacks and servicemen involved in the loading and handling of the rounds. Residual DU in soil (and thus water-tables) has also been implicated in a sharp spike in birth defects observed in certain areas of Iraq immediately after the Gulf War.
A very important innovation in the design of the GAU-8/A shells is the use of aluminium alloy cases in place of the traditional steel or brass. This alone adds 30% to ammunition capacity for a given weight. The shells also have plastic driving bands to improve barrel life. They are imposing to examine and handle, measuring 11.4 in (290 mm) in length and weighing 1.53 lb (694 g) or more. (Spick, 2000, p. 44).
Originally, the Avenger's rate of fire was switchable between 1,800 rounds per minute (RPM) and 4,200 RPM. In later modifications, the 4,200 RPM rate of fire was deleted and replaced with a slightly lower 3900 RPM. Also the low rate of fire (1800 RPM) was deleted as being tactically inferior to a high rate of fire - it is better to ensure a first-time kill by using a high rate of fire, rather than having to make a risky second pass just to put a sufficient number of rounds on the target [1]. 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 21,000-round life for each set of barrels. It is also said that this is to deal with the substantial deceleration of the plane that results from firing .
The GAU-8/A ammunition is linkless, reducing weight and avoiding a great deal of potential for jamming. The feed system is double-ended: the spent casings are not ejected from the aircraft (which takes a great deal of force if the possibility of severe airframe damage is to be eliminated) but are cycled back into the ammunition drum. The feed system is based on that developed for later M61 installations, but uses more advanced design techniques and materials throughout, to save weight.
Anyway.... can we slide this topic slightly back towards Homewolrd

should have some pics up later of the Defenders...and I have started work on the Taiidan light fighter ships.