M45 Quadmount

M45 on an M20 trailer in the Musée des Blindés
M16A1 MGMC in Overloon

The M45 Quadmount (nicknamed the "meat chopper" and "Krautmower"[1] for its high rate of fire) was a weapon mounting consisting of four of the "HB", or "heavy barrel" .50 caliber M2 Browning machine guns (of the M2 Turret Type (TT) variant[1]) mounted in pairs on each side of an open, electrically powered turret. It was developed by the W. L. Maxson Corporation to replace the earlier M33 twin mount (also from Maxson).[1] Although designed as an anti-aircraft weapon, it was also used against ground targets. Introduced in 1943 during World War II, it remained in US service as late as the Vietnam War.

History

CCKW-353-B2 guntruck with M45 on M20 trailer in bed, loading ramps attached to side

In order to develop a mobile anti-aircraft weapon, several 0.5 inch (12.7 mm) twin machine gun mounts were tested on the chassis of the M2 half-track including Bendix, Martin Aircraft Company, and Maxson. The Maxson M33 turret mount was preferred and - on the larger M3 half-track (T1E2) - was accepted for service in 1942 as the M13 Multiple Gun Motor Carriage. The mount was also used on the similar M5 half track as the M14 Multiple Gun Motor Carriage.[2][3][4]

Experimentally, the Quadmount was also tested in 1942 on a M3 Light Tank in place of the tank's turret but the project was not proceeded with.[5]

Even as production of the two MGMC vehicles was underway, there was work to increase the firepower. Re-working the M33 to take four machine guns gave the M45 mounting.

The M45 Quadmount was the principal weapon (along with the 37mm gun) of highly mobile anti-aircraft artillery battalions deployed in the European Theater during World War II. These battalions provided invaluable air defense to much larger units, particularly field artillery. The M45 Quadmount units served as a very strong deterrent to strafing runs by enemy warplanes as, in addition to their gross firepower, its quartet of Browning M2HB "heavy barrel" .50 caliber guns were capable of being "tuned" to converge upon a single point at distances which could be reset while in use. Multiple-gun mounts were developed for the M2 Browning because the M2's rate of fire (450-550 rounds per minute) for a single gun was too low for anti-aircraft use.[1]

The M45 found use throughout the war as a land-based weapon, particularly during the Battle of the Bulge. Although the Allies achieved air supremacy by the invasion of Normandy in June 1944, German attack runs were still a threat. German fighter-bombers could approach and attack at low altitude and then quickly retreat to avoid Allied fighters. The Luftwaffe also mustered a large number of planes for the massive Operation Bodenplatte New Year's Day 1945 attack. On March 7, 1945 when the U.S. Army discovered the Ludendorff Bridge intact across the Rhine, M45-armed U.S. half-tracks defended the American troops crossing the bridge on March 9, 1945 to great effect. At Oppenheim, when the Allies were gathering to make a massive push after crossing the River Rhine (March 1945), 248 German warplanes were used in an effort to destroy the bridge first. U.S. Army anti-aircraft artillery battalions massed, shot down 30% of the attacking force mainly with M45 Quadmounts and prevented the bridge from being touched before the U.S. Third Army went into Germany.

The M45 Quadmount was of little use against the new, fast-flying planes of the Jet Age. However, it was used against infantry targets in US post-war service.

TCM-20

Israeli TCM-20, Israeli Air Force Museum

The TCM-20 was a postwar Israeli development of the M45 mount, equipped with two 20mm Hispano-Suiza HS.404 cannons in lieu of machine guns. In frontline Israeli service, it was replaced by the M163 Vulcan Air Defense System in the 1970s, but some reserve units still used TCM-20s into the 1980s. The weapon was also exported to several third-world countries.

Mountings

M20 trailer mount, 1947
M17 trailer mount, 1947

The M45 was combined with a variety of towed or self-propelled mounts; namely the M20 trailer, a light single axle trailer; or with the M17 trailer, a heavier tandem axle trailer based on a searchlight platform. When combined with the M17 trailer, they M45 system was called the M51 Multiple Machine Gun Carriage, and when combined with the M20 trailer it was called the M55 Machine Gun Trailer Mount.

It was also mounted on the M3 Halftrack for greater mobility, in which combination it formed the M16 Multiple Gun Motor Carriage. On the M5 Half-track, the combination was the M17 Multiple Gun Motor Carriage.

M16A1 MGMC

Operation

The M45 is operated by two loaders and one gunner. The mount is capable of traversing a full 360 degrees around, with an angle elevation between -10 and +90 degrees. Traverse and elevation are electrically driven, powered by two rechargeable 6-volt batteries. All four guns could be fired at once, but standard practice was to alternate between firing the upper and lower pair of guns, allowing one pair to cool while the other was in use. This allowed for longer periods of action as overheating of the gun barrels was lessened.[1]

The "tombstone" model M2 ammunition chests held 200 rounds apiece — with one ammunition chest on an M45 system holding ten times as many rounds as each of the four twenty-round 20mm magazines of the German Flakvierling system held (and which, on the German ordnance system, had to be changed every six seconds on each gun of the quartet to ensure its own top 800 rpm "combined" firing rate), with each M2 ammo chest weighing 89 pounds apiece when full.

See also

Notes

Training Manuals

M20 trailer

M17 trailer

References

  1. 1 2 3 4 5 Rottman, Gordon L., Browning .50-Caliber Machine Guns, Osprey Publishing (2010), ISBN 9781849083317, p. 19-20
  2. ↑ Zaloga, M3 Infantry Half Track, Osprey Publishing (2004) p. 38.
  3. ↑ Green (2000), p. 150.
  4. ↑ Chamberlain & Ellis (1969) British and American Tanks of World War II Arco Publishing. p191
  5. ↑ Chamberlain & Ellis (1969) p89-90

External links

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