The Pima Air and Space Museum has an A-10 Warthog on display. That’s an impressive aircraft with impressive features. The most impressive, I think, is the Warthog’s GAU-8/A 30mm Gatling gun. “GAU” is the military abbreviation for modern Gatlings. It stands for Gun, Automatic, Utility, and it’s pronounced “Gow.”
Viewed from the front, the A-10’s Gatling gun seems like it is offset from the aircraft center line. The reason is only one barrel fires at a time as the barrel cluster rotates, and it does so when it is on the aircraft centerline. When firing at the gun’s maximum rate (4,000 shots per minute), the recoil equals the A-10’s 18,000-pound max thrust. If the firing barrel was not on the aircraft centerline, the gun would steer the aircraft when firing.
The photo below shows the A-10’s Gatling muzzle clamp, which is the device that holds the gun’s seven barrels together at the forward end. The barrels are welded shut on this display aircraft to prevent a bad guy from stealing and using the gun.
The muzzle clamp’s center bolt secures the muzzle clamp to the barrel cluster. Maintenance folks never stand in front of the gun when removing the muzzle clamp. Applying torque to the muzzle clamp bolt might rotate the barrel cluster, doing so could bring the firing barrel into position, and if the gun is loaded, it might fire. In the old days of the Civil War era Gatling guns, it was not uncommon for a soldier to inadvertently fire a round when attempting to remove the muzzle clamp.
Here’s the A-10’s GAU-8/A Gatling removed from the aircraft (another Pima Air and Space Museum display item). It’s about the same length as a Volkswagen Beetle.
This next photo shows the gun’s bolts (there’s one for each barrel). It also shows the elliptical cam path in the gun’s rear housing. The elliptical cam path that drives the bolts back and forth as the barrel cluster rotates. That was Dr. Gatling’s original idea. All Gatling guns use this concept, from the first Gatling gun in 1862 to the modern Gatlings.
If you are interested in the Gatling gun, its history, and its current applications, you might want to pick up a copy of The Gatling Gun.
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