Wikipedia

M45 Quadmount

(Redirected from M55 machine gun trailer mount)

The M45 Quadmount was a towed anti-aircraft gun consisting of four .50 caliber M2 Browning machine guns mounted in pairs on either side of an armored open-top gunner's compartment with electrical laying. It was developed by the W. L. Maxson Corporation to replace the earlier M33 twin mount (also from Maxson).[2] Although designed as an anti-aircraft weapon, it was also used against ground targets, where it earned the nicknames "meat chopper" and "Krautmower".[2] Introduced in 1944, it saw service as late as the Vietnam War.

M45 Quadmount
M45 on an M20 trailer in the Musée des Blindés
TypeAnti-aircraft gun
Heavy machine gun
Place of originUnited States
Service history
WarsWorld War II
First Indochina War
Korean War
Vietnam War
Portuguese Colonial War
Indo-Pakistani War of 1965
Nicaraguan Revolution
Specifications
Mass2,396 lb (1,087 kg)
Barrel length5 ft 3 in (1.6 m) L/50[1]
Shell.50 BMG (12.7×99mm NATO)
Shell weight21 oz (.6 kg)
Caliber0.50 in (12.7 mm)
ActionShort recoil-operated
Elevation-5° to +90°
Traverse360°[1]
Rate of fire575 x 4 = 2,300 rpm
Muzzle velocity2,900 ft/s (890 m/s)
Effective firing range4,900 ft (1.5 km) (effective AA)
15,000 ft (4.5 km) (maximum AA)
Maximum firing range1.1 mi (1.8 km) (horizontal)
1.6 mi (2.5 km) (maximum)
Feed systemBelt-fed (M2 or M9 links)[1]

History

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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.[3][4][5]

Experimentally, the Quadmount was also tested in 1942 on a M3 Light Tank in place of the tank's turret but the project was terminated.[6]

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 produced 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.[2]

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 Jabo 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 Operation Bodenplatte that took place on New Year's Day 1945.

It was also tested by the US Navy as a solution for the Kamikaze attacks that started in late 1944. Two Essex class aircraft carriers received six mounts each for operational testing starting with CV-16 Lexington in May 1945. The guns were too light and ineffective against the high speeds that the diving Kamikaze aircraft possessed.[7]

The M45 Quadmount was ineffective against the new, fast-flying planes of the Jet Age. However, it was used against infantry targets in US post-war service. In Vietnam they were pressed into service to defend bases and to ride escort convoys along Viet Cong roads.[8]

The French Army also used M45s in combat. M45 Quad Mounts were placed in trucks to deal with ambushes and four M45s were used during the Battle of Dien Bien Phu.[9]

TCM-20

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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

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During World War II, the M45 turret was mounted on two specific systems; the M16 Multiple Gun Motor Carriage and the M51 Multiple Machine Gun Carriage. When mounted on the M20 trailer, it was known as the M55 Machine Gun Trailer Mount, but this system had not finished testing before the cessation of hostilities. M51s were withdrawn from service by the end of World War II in favor of the M55.

During the Korean War, the M55 and M16 saw extensive combat, and lessons learned in Korea led to the conversion of an additional 1200 M3 halftracks into the M16A1 variant by adding an M45 turret. These can be identified by the lack of fold-down armor and rear troop door on the crew compartment and were often fitted with the roller front bumper instead of the winch bumper fitted to all M16s. In 1954 an additional modification was made to roughly 700 M16 MGMCs, adding the rear troop door and bolting the fold-down armor in the up position. This modification became known as the M16A2 MGMC.

The M55 received a new, more powerful generator in the 1960s and served through the Vietnam War, usually mounted in the back of an M35 2.5 ton or M54 5-ton gun trucks.

Operation

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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.[2]

The "tombstone" model M2 ammunition chests held 200 rounds each—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 each when full.[citation needed]

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Operators

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See also

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Notes

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  1. ^ a b c Chamberlain, Peter (1975). Anti-aircraft guns. Gander, Terry. New York: Arco Pub. Co. p. 54. ISBN 0668038187. OCLC 2000222.
  2. ^ a b c d Rottman, Gordon L., Browning .50-Caliber Machine Guns, Osprey Publishing (2010), ISBN 9781849083317, p. 19-20
  3. ^ Zaloga, M3 Infantry Half Track, Osprey Publishing (2004) p. 38.
  4. ^ Green (2000), p. 150.
  5. ^ Chamberlain & Ellis (1969) British and American Tanks of World War II Arco Publishing. p191
  6. ^ Chamberlain & Ellis (1969) p89-90
  7. ^ "RAL - USS Lexington report on Service Experience with Six Caliber .50 Gun Mounts, Mark 31 Mod 0". Archived from the original on 2018-09-24. Retrieved 2017-08-17.
  8. ^ Rottman, Gordon L. (20 Sep 2011). Vietnam Gun Trucks. New Vanguard 184. Osprey Publishing. p. 36. ISBN 9781849083553.
  9. ^ a b "1° Groupe d'Artillerie Antiaérienne Coloniale d'Extrême-Orient - Wehrmacht-Awards.com Militaria Forums". Archived from the original on 2016-10-20. Retrieved 2016-10-19.

References

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Training Manuals

M20 trailer

  • SNL G220
  • TM 9-789

M17 trailer

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