12"/50 caliber gun (Argentina)

12"/50 caliber Bethlehem gun
12"/50 caliber Bethlehem gun
	a main gun of the battleship ARA Moreno during its construction, sometime between 1910 and 1915.
Type	Naval gun
Place of origin	United States
Service history
In service	1915–1956
Used by	Rivadavia-class battleships
Wars	World War I, World War II
Production history
Designed	1910
Manufacturer	Bethlehem Steel Corporation
Specifications
Mass	66 tons
Barrel length	50 ft 6 in (15.39 m) bore (50 cal)
Caliber	12 inches (304.8 mm)
Recoil	38 inches (97 cm)
Rate of fire	2.0–3.0 rounds per minute
Maximum firing range	24,000 yd (22,000 m)

The 12"/50 caliber Bethlehem gun was a US naval gun designed in 1910 as the main armament for the Argentine Navy’s dreadnought battleships of the Rivadavia class.

Design[]

The gun was designed in 1910, and it was probably based on the US 12"/50 (30.5 cm) Mark 7 naval gun with a breech weight added. The guns were manufactured at the Bethlehem Steel Corporation.^[1] The ships in the class had twelve 305 mm guns each, mounted in six twin (2-gun) turrets, with two turrets forward, two aft, and one on each side.

Measurements and Capabilities[]

Main deck and guns of Moreno

The gun weighed 66 tons including the breech and was capable of an average rate of fire of 2–3 rounds a minute. It could throw an 870 lb. (394.6 kg) Mark 15 armor-piercing shell 24,000 yards (21,950 meters) at an elevation of 14.7°, while the "barrel life" of the guns was 200 shots.

The previous 12" gun, manufactured for the U.S. Navy, was the Mark 7 version, a very similar gun which had been designed and installed in the 1912 era Wyoming-class battleships.^[1]

Service[]

This gun was only installed in the Argentine Navy Rivadavia-class battleships Rivadavia and Moreno.

References[]

Citations[]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j DiGiulian, Tony. "Argentina - 12"/50 (30.5 cm) Bethlehem". Navweaps.com. Archived from the original on 14 January 2010. Retrieved 22 February 2010.
^ 1956 is the year the Argentinian battleships were decommissioned.

Sources[]

External links[]

History and specifications, at Naval Weapons of the World website (NavWeaps.com) (retrieved 2010-02-22)
"Haze Gray & Underway" - World Battleship Lists - Argentina (retrieved 2010-02-22)
(in Spanish) "Historia y Arqueología Marítima" (HistArMar) - Battleships ARA Moreno & Rivadavia - History & Pictures (retrieved 2010-02-22)

[navweaps-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j DiGiulian, Tony. "Argentina - 12"/50 (30.5 cm) Bethlehem". Navweaps.com. Archived from the original on 14 January 2010. Retrieved 22 February 2010.

[2] 1956 is the year the Argentinian battleships were decommissioned.

[1]

[2]