This means that the firing rate is multiplied by the number of barrels, as six barrels are being loaded in parallel. Each barrel is fired as it passes through the top position, after which the spent case is extracted and ejected, and a new round is fed and chambered - all at different positions on the circle described by the revolving barrel. As the 6 barrels revolve, they proceed through the different stages of the gun firing cycle. ( photo)The multiple-barrels cannon offers both advantages in firing rate and in barrel life. Gun Maintenance at Hill AFB: the barrel assembly has already been removed, while the ammo drum is currently being lifted out. Recently, GE's armament division was acquired by Martin Marietta, so the M-61 is now officially known as the Lockheed-Martin M61A1 with the main difference being the A1 version having a linkless feed system. Today, after a period of neglect (when guns were thought to be rendered obsolete by missiles), the M61 in one form or another, is an integral part of the armament of modern fighters such as the F-15, F-18 and of course the F-16. Initial problems with the gas bleed resulted in a temporary suspension of firing tests, until a better venting system for the F-104 gun compartment was designed. The Vulcan was first fired in pre-production form in 1953, and made its first flight in the Lockheed F-104. In 1950, the US General Electric Company began designing a cannon for USAF fighters under the Vulcan Project, based on the multi-barrel concept pioneered by Richard J. With propellants of the time and period metallurgy it was a good idea but one that was not ready until new technology came along. Results were high rate of fire and a high rate of barrel wear out. The idea of hooking up unlimited ammo to a late 19th century "Gatling" type weapon, and powering it electrically was attempted by the US Navy for use on their Torpedo/gun boats. The 20mm Hispano carried by the P-38 was a relatively low velocity weapon. 50 cal main armament of the P-51 and P-47. The lesson of WWII was that the German, Italian and Japanese fighters could reach out and touch the Americans with their cannon main armament, while the latter had to get up close and personal with the. In 1947 the brand new USAF made a request for a new aircraft gun.
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