The Davis cannon

Bob Wright

Hawkeye
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Anybody familiar with the Davis Cannon or WW I usage? An early attempt to make a recoilless gun. During WW I the Davis Cannon was mounted in the nose of Navy patrol bombers, angled to fire downward and forward. This an attempt to attack German U-Boats and reduce the threat.

The Davis cannon was about 100 mm bore as I recall and fired a high explosive round. To eliminate recoil, the Davis gun was actually two guns joined together at the breech firing in opposite directions. Both guns fired at the same time, on firing downward at the target, the other firing a projectile of equal weight but having no charge. Usually a steel slug or even concrete. The opposing recoil forces nullified the gun's normal recoil.

The problem was in the airplane in use, a high wing twin engine seaplane. The rearward facing gun's blast took a heavy toll on the plane's wings and engines. Not until the recoil rifles of WW II fame did the recoiless gun come into use. And those at the expense of a tremendous back blast.



Bob Wright.
 
Bob Wright said:
......... Not until the recoil rifles of WW II fame did the recoiless gun come into use. And those at the expense of a tremendous back blast.
Bob Wright.
Yup... in Vietnam, we had the single-use disposable M72 LAW (Light Ant-tank Weapon). Learning to fire it, the instructor says, "The propellant in the solid-fuel rocket is completely expended before the projectile leaves the tube." I would change that to "ALMOST completely expended". My eyebrows were toast.

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That appears to have been a rocket launcher. The recoilless rifles of WW II and Korea fired projectiles from a rifled bore using a shell casing with powder. The shell case was perforated and the powder contained in nylon bags. The breech block was open top and bottom to vent the propellant gasses rearward. The 57 mm RR could be fired from the shoulder, but others were tripod mounted, and the 106mm was Jeep mounted. The 106 also had a semi-automatic .50 caliber spotter rifle mounted on top. It took a special .50 cal. round, not the .50 BMG round. It compared to the .50 BMG like the .308 compares to the .30-06.

Bob Wright
 
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