The Machine Gun

The Feed Mechanism The Szakats

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The Fesxd Mechanism oi the Szakats Automatic Aircraft Cannon.

in the chamber. This allowed the forward thrust of the bolt to back up the cartridge when the explosion took place. As the weapon was not locked at the instant of firing, it was necessary to grease the cartridges used with the cannon. The inertia of fast traveling bolt and spring pressure served as the only lock. The action was straight blow back, no provision being made for retarding the movement.

The weapon could be mounted either flexibly or fixed in aircraft. When installed in the wings, it was possible to synchronize its front-seared action to fire through the propeller arc. When so installed, an ammunition box holding 100 cartridges was seated near it.

To fire the Szakats, the linked cartridges must first be brought out of the container and the first round placed in the fluted portion of the revolving feeder. This part of the feed must be disconnected from the rear portion by means of a throw-out device. Tire flutes can then be rotated by hand until charging of the gun indexes it into place.

The fore and aft members of the feed are again connected and the gun is ready to be manually cocked. This is done as the operating parts are pulled as far as possible to the rear and then released to go into battery. The positioned round is now chambered and the firing pin cocked. By turning the left-hand grip, the trigger bar with o I oO

its ball-shaped end is pulled rear ward, camming the sear out of engagement with the projection on the rear of the firing pin. The latter Hies forward, firing the gun.

The projectile clears the bore before the case is withdrawn and the chamber pressure is reduced far enough to prevent rupture from the initial shock of explosion. Having been lubricated, the empty ease slips bac k with the recoiling bolt, being held in position by the extractor claw until it strikes the ejector, located 8% inches to the rear of the chamber. At this point the ejector pivots the case around the extractor and knocks it to the left through the opening in the receiver.

The stud on the bottom of the bolt that actuates the feed rides in comparatively free move ment, for the first 5 inches of recoil, but now the angle is accelerated. The flutes on the feed wheel are rotated rapidly one space, rolling a cartridge up through the floor of the fccdway. The round is then held in place by its link and the nose of the projectile. This is slightly behind a guide ramp that leads it into the chamber. The bolt, in finishing its recoil stroke, compresses the buffer spring. It also starts a sudden compression of the dash pot and then begins countcrrccoil. The rib on the bottom of the bolt contacts the base of the indexed cartridge, shoving it out ot its link and starts to chamber it. At a distance

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