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Colt MG52-A (Patreon)

Published:
2021-03-31 16:00:38
Imported:
2021-04

Content

Scheduled for April 19.

Files

Colt's MG52-A: Water-Cooled 50-Caliber Heavy Machine Gun for the World

http://www.patreon.com/ForgottenWeapons https://www.floatplane.com/channel/ForgottenWeapons/home Cool Forgotten Weapons merch! http://shop.bbtv.com/collections/forgotten-weapons Before these war the Browning M2, there were a series of Colt commercial .50 caliber machine guns. The .50 BMG (12.7x99mm) cartridge began development in 1918, and after the end of the war Colt and John Browning finalized a water-cooled machine gun to use it. While military experimentation and development continued, Colt introduced the gun as the Model 1924, and sold it in both water-cooled and air-cooled varieties. The names were changed in 1932/3 to become the MG52 (water cooled) and MG53 (air cooled) to keep the guns sounding modern. In addition, they introduced the MG52-A, which was a water cooled model with interchangeable feed to accommodate vehicle and dual mounts. The Model 1924/MG52 has a number of early features that would be changed when the M2 become the standard model. These have simple straight-line charging handles, instead of the camel system of the M2. They have rear sights like the early M1917 .30 caliber guns, manual safeties, and are built on dedicated water-cooled receivers (the M2 would introduce a universal receiver). Only a few thousand of these were made by World War Two, and their production did not resume after the war. Contact: Forgotten Weapons 6281 N. Oracle 36270 Tucson, AZ 85740

Comments

Joseph W Cupp

Having spent a fair bit of time behind an M2 it is quite interesting to see where it came from and to see just how little and yet how much it changed. And like most of the people that have fired it, it is one of my favorites. John Moses Browning sure knew how to put a smile on peoples faces.

Anonymous
>>58052811

I'm not sure being shot AT by a .50 cal machine gun puts a smile on anybody's face..

Anonymous

I loved my Ma Deuce. Of course i was in artillery and armor and didn't have to hump it like a "crunchie." One very nice thing in this particular video is that you can clearly see how the rear sight slide and aperture move to the left as the range is increased to deal with the right drift of bullets launched from barrels with right hand twist. Shooting at a short range with an eight inch howitzer, say at 2800 meters, equivalent to the MG52 max sight range, requires a 5 mil correction to the left to counter the right drift which is at least approximately the same for the M52/M2. This means that the barrel must be actually aimed 15 meters to the left of the target which is what the 50 cal sight is accomplishing. At the maximum range of an eight inch howitzer, M110A2, of 22,800 meters, the drift correction is 39 mils which means the gun is actually aiming at a point 889 meters to the left of the spot where the two hundred pound shells are going to impact. And this is not the same thing as the coriolis correction for the earth's rotation during the 77 seconds of time that the projectile is in the air. which is an additional correction we had to make. The corolis correction varies with latitude and azimuth of fire so we had to look at tables for the correct value.

Anonymous

I don't see the sling swivils for carrying them into combat. Also kind of hard to fire them from the hip. Laughter - but a beautiful piece of engineering.

Anonymous
>>58074267

I have a paper on ResearchGate explaining how spin-drift can be calculated without resorting to a full 6-DoF ballistic simulation. Spin-drift is caused by gravity induced nose-high projectile attitude. As a gyroscopic effect, its displacement leads the pitch error by 90 degrees in the sense of the rifling twist. James A. Boatright, Ballistician

Anonymous

James, I read you paper. The simpler explanation that I was trained on is that the ogive of the shell had to be designed to make sure that the nose "tipped over" in flight so that the nose would strike the ground first making the fuse function to set off the explosive filling. The ogive shape put the center of gravity in the right place so that the gyroscopic precession resulting from the gravitational force tipping the nose downward would result in the nose also turning to the left (right hand twist) creating aerodynamic lift to the left and deflecting the projectile to the left. For example, the M33 ball .50 projectile leaves the muzzle at 861.1 meters per second (2,825.1 fps.) To reach a range of 2800 meters the superelevation (the bore line above the line of sight to the target) must be 74.5 mils (251,4 moa) and the angle of fall (the angle the projectile is descending on at the target) is 156 mils, 526.5 moa, 8.775 degrees. Notice it is descending at a much steeper angle than it went up on at the muzzle. Similarly, for a maximum range of 5671 meters, superelevation is 553.9 mils and the angle of fall is 1065 mils more than 66 degrees! To go that far the bullets must climb to a height 1436 meters at 3500 meters downrange and stay in flight for 33.0 seconds.

Douglas Knapp
>>58074267

Interesting Gary! Have shot a half-dozen firearms and feel relativley ignorant, although aware of some basics of sight adjustment. Well, I THOUGHT so! Being a scientist too, it sure makes sense. It's not a gyroscopic effect, because that force is aligned with the direction of movement, so it's just that bullet pulling air sideways as it rotates, eh?