3-inch gun M1918 explained

3-inch gun M1918
Origin:United States
Type:Anti-aircraft gun
Is Ranged:yes
Is Artillery:yes
Used By:United States Army
Weight:12200lb
Length:7.6abbr=onNaNabbr=on
Part Length:3.8abbr=onNaNabbr=on 40 calibers
Width:2.1abbr=onNaNabbr=on
Height:2.8abbr=onNaNabbr=on[1]
Cartridge:fixed 76.2 x 585mm R[2]
Cartridge Weight:15lb
Caliber:3 in (76.2 mm)
Velocity:2400ft/s
Max Range:25800feet AA ceiling
Breech:Semi-automatic vertical breech block
Recoil:Hydro-pneumatic
Carriage:4 wheeled cruciform carriage
Elevation:+10° to +85°
Traverse:360°

The 3-inch gun M1918 was a United States 3-inch anti-aircraft gun that entered service in 1918 and served until it was largely superseded by the 3-inch anti-aircraft gun M3 in 1930, though the M1918 remained with some National Guard units until early in World War II. The M3 was subsequently replaced by the M1 90mm AA gun early in World War II, primarily during 1942.[3] The M3 3" gun was later adapted for the anti-tank role, serving as the main armament of the M10 tank destroyer during World War II.

The predecessor: 3-inch gun M1917

See main article: 3-inch M1917. The 3-inch gun M1917 was the United States Army's first dedicated anti-aircraft gun, entering service during World War I. Only a few were built, as the similar 3-inch gun M1918 on a mobile mount was considered more useful and was produced in large numbers.Development of the M1917 started in 1915, and as the name implies, took two years to enter service. The gun was essentially an unmodified 3-inch M1903 (76.2 mm L/55) coastal-defense gun barrel on a new fixed mount allowing it to be aimed to high elevations.[4] [5] A number were used during World War I on fixed mountings; 116 were completed by April 1919. Most of the weapons were deployed at United States Army Coast Artillery Corps seacoast forts after World War I. In the immediate post-war era it was developed as the 3-inch M2, using a removable barrel liner. In 1928 it was further improved in the 3-inch M4 by using a thicker removable liner that eased manufacturing. However, the M2 and M4 appear to have been produced in small quantities. The M1917, M2, and M4 remained in service through World War II.

History of the 3-inch M1918

For mobile use the original coastal gun was too heavy, so a smaller version was developed as the 3-inch M1918. This weapon was based on the Driggs-Seabury 3-inch gun M1898, a smaller predecessor of the M1903. This weapon had a barrel 50 calibers long instead of 55 calibers, and a smaller breech (200cuin instead of 296cuin[6] with a different cartridge (reportedly 76.2x585R instead of 76.2x690R) featuring the maximal propelling charge decreased from |5.62lb to 4.94lb.[7] The barrel of the M1918 was shortened to 40 calibers and a semi-automatic breech was added. "Semi-automatic" on this type of weapon meant that the breech would open automatically after firing. Like the adaptations that created the M2 and M4, the M1918 was also fitted with a removable liner in 1927 and a barrel 50 calibers long, becoming the 3-inch M1; a year later the M3 weapon was introduced with a larger removable liner. Another upgrade was started in 1931 as the T8, and then T9, but these projects were cancelled in 1938 when the 90 mm gun M1 was selected in their place. The 3-inch gun M1918 remained in service, particularly in National Guard units, and saw action in early World War II.

In September 1940 a project started to adapt the 3-inch gun to the anti-tank role, starting with the T9 experimental model but equipping it with the breech, recoil system and carriage borrowed from the 105mm M2 howitzer. The gun was accepted for service as the 3-inch M5.

A similar derivative of the T9 – the 3-inch M6 – was intended to be mounted on the M5 self-propelled gun, which was eventually abandoned. A final adaptation was the 3-inch M7, which included minor modifications for mounting on the M6 heavy tank and M10 tank destroyer. M7 saw wide use although it was supplanted to some extent by more powerful weapons such as the 90mm M3 and the British QF 17 pounder. 6,824 M7 guns were manufactured.[8]

Variants

Self-propelled mounts

Surviving examples

The only known surviving example is located at the Fort Sill, Oklahoma, museum.

See also

Weapons of comparable role, performance and era

References

External links

Notes and References

  1. Book: Chamberlain, Peter. Anti-aircraft guns. 1975. 56. Arco Pub. Co. Gander, Terry. 0668038187. New York. 2000222.
  2. Web site: 77-77 MM CALIBRE CARTRIDGES. www.quarryhs.co.uk. 2017-09-13. 2015-01-17. https://web.archive.org/web/20150117004159/http://www.quarryhs.co.uk/ammotable9.html. dead.
  3. Berhow, pp. 256–258
  4. Berhow, pp. 250–252
  5. Web site: Excerpt from online book A Magnificent Fight: Marines in the Battle for Wake Island by Robert J. Cressman . 2015-03-21 . 2015-03-17 . https://web.archive.org/web/20150317022303/http://www.cr.nps.gov/history/online_books/npswapa/extContent/usmc/pcn-190-003119-00/sec1.htm . dead .
  6. Web site: Handbook of artillery: including mobile, anti-aircraft and trench matériel. Internet Archive. 25 June 2023. 331,344.
  7. https://www.bulletpicker.com/pdf/TR-1360-3A-1928.pdf Technical regulations
  8. Chamberlain, Gander – Anti-Tank Weapons, p 49.
  9. Hunnicutt, 1998, p 193, 194, 213.
  10. Hunnicutt, 2002 p 41.
  11. Hunnicutt, 1992, p 295-296.
  12. Hunnicutt, 2002, p 71, 164.
  13. Hunnicutt, 2002, p 163, 164.
  14. Hunnicutt, 1992, p 298-301.
  15. Hunnicutt, 1994, p 360-361.
  16. Hunnicutt, 1994, p 557.

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