The white outline reflects a slight placementĬhange Detail from U.S. Note the special tampion to keep water out of the barrel and the restraining bipod. 3"/50 wet-mount on USS Swordfish SS-193 in June 1943. Naval Historical Center Photograph # NH 44872. Gunnery practice off the coast of France aboard USS Noma SP-131 during World War I. Naval Historical Center Photograph # NH 80138. This is a later model of the 3"/50 (7.62 cm), as shown by the different breech. Naval Historical Center Photograph # NH 41984. Breech view of the same 3"/50 (7.62 cm) gun as pictured above. Naval Historical Center Photograph # NH 41985. (2.97 kg)ģ"/50 (7.62 cm) AA gun manufactured during World War I. HC and AA (including nose fuze): 12.13 in (30.8 cm)ĪA VT (including nose fuze): 12.22 in (31.0 cm)Ĭartridge Case Type, Size and Empty Weight
Aa dlight 1218 mod#
The data that follows is for the Mark 21 Mod 0 unless otherwise specified.ĪP Mark 29 Mods 1 and 2: 13.1 lbs. Plated bores and autofretted monobloc barrels secured to the breech housings by bayonet joints.
Both the Mark 21 and the Mark 22 had chromium See the data page on theģ"/50RF (7.62 cm) for additional information. Led to this barrel being selected for the post-war automatic mountings. Use with a concentric counter-recoil spring, which was used only on Mark 24 mountings during World War II. Marks 21 and 22 were very similar apart from a collar on the chase on the Mark 22. Mark 19 had monobloc constructionĪnd thus a lighter gun. Manufactured from a copper-nickel alloy with A tube, jacket, screwed and shrunk breech housing. Mark 18 was intended for wet mountings and Mark 17 guns were intended for wet mountings and had the boreĪnd external working surfaces chrome plated and the chase painted with red lead. Marks 10, 17 and 20 were built-up guns with A tube, jacket and hoop. The Mark 10 was derived from the 3"/50 (7.62 cm) Mark 6 with a modified breech that was of the vertical sliding wedge type. The firing mechanism with light machine oil instead of grease as a correction for the problem, but this was not always successful. Navy ordnance publications for this weapon recommended lubricating When the breech block was closed, the firing pin could stick outĪnd strike the cartridge igniter and accidentally fire the gun. There was a design defect in the breech block of the Mark 22. With director control, RPC and VT ammunition was superior to a twin Bofors 40 mm mount and at least equivalent to a quad Bofors In the fall of 1945, CinCPac considered that a 3"/50 (7.62 cm) Guns, giving the later marks of this weapon a new lease on life. However, the invention of the VT fuze and theĪddition late in the war of power operation together with the Mark 51 director system greatly improved their effectiveness as AAA Shells and were manually operated, meaning that they could not be fitted for RPC. During World War II this weapon was extensively used on smaller warships suchĪs destroyer escorts, submarines and auxiliaries along with many merchant ships with about 14,000 guns being produced betweenĪlthough considered to be dual-purpose weapons, these guns had limited effectiveness in either role, as they fired light-weight York and Arkansas still had them as late as 1943. Mountings and later by Bofors 40 mm in twin and quad mountings. The 1930s, but were then gradually replaced on larger ships by 5"/25 (12.7 cm) single These were of a simpler construction than the previousģ" (7.62 cm) guns and successive marks were to improved designs.
Aa dlight 1218 series#
A series of 3" (7.62 cm) AA guns dating back to World War I.
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