|14 cm/40 11th Year Type naval gun|
14 cm/40 11th Year Type naval gun aboard Japanese submarine I-400 being inspected by United States Navy personnel.
|Place of origin||Empire of Japan|
|Used by||Imperial Japanese Navy|
|Wars||World War II|
|Weight||3,900 kilograms (8,598 lb)|
|Length||5.9 meters (19 ft 4 in)|
|Barrel length||5.6 meters (18 ft 4 in) (bore length)|
|Shell||separate-loading, brass case|
|Shell weight||38 kilograms (84 lb)|
|Caliber||14-centimeter (5.5 in)|
|Breech||Horizontal sliding breech block|
|Elevation||+30° to −5°|
|Rate of fire||5 rounds per minute|
|Muzzle velocity||700 meters per second (2,300 ft/s)|
|Maximum range||16,000 meters (17,000 yd)|
The 14 cm/40 11th Year Type naval gun was the standard surface battery for Japanese submarine cruisers of World War II. Most carried single guns, but Junsen type submarines carried two. Japanese submarines I-7 and I-8 carried an unusual twin mounting capable of elevating to 40° . Eleventh year type refers to the horizontal sliding breech block on these guns. Breech block design began in 1922 AD, the eleventh year of the Taishō period. The gun fired a projectile 14 centimeters (5.5 in) in diameter, and the barrel was 40 calibers long (barrel length is 14 cm x 40 = 560 centimeters or 220 inches).
This gun was the weapon used by I-17 to sink SS Emidio and to later shell the Ellwood Oil Field near Santa Barbara, California. It was also used by I-25 for the Bombardment of Fort Stevens in Oregon near the mouth of the Columbia River and by I-26 to shell the Estevan Point lighthouse in British Columbia.
A longer-barreled 14 cm/50 3rd Year Type naval gun was used aboard surface ships and for coastal defense. The 40 caliber 11th Year Type guns were intended for use against destroyers, and fired base-fuzed projectiles with thinner shell walls allowing a larger bursting charge than the 50 caliber 3rd Year Type guns for potential use against armored ships. The lower velocity 40 caliber gun had a useful life expectancy of 800 to 1000 effective full charges (EFC) per barrel.
- Campbell 1985 pp.173 & 191
- Fairfield 1921 p.156
- Webber 1975 pp. 14–16 & 40–62
- Campbell 1985 pp.190–191
- Campbell, John (1985). Naval Weapons of World War II. Annapolis, MD: Naval Institute Press. ISBN 0-87021-459-4.
- Fairfield, A.P. (1921). Naval Ordnance. The Lord Baltimore Press.
- Webber, Bert (1975). Retaliation: Japanese Attacks and Allied Countermeasures on the Pacific Coast in World War II. Oregon State University Press.