[148] On 19 April 1989, 47 sailors were killed following an explosion in her No. This array included up to 20 quad 40 mm mounts and 49 single 20 mm mounts. 8 armor-piercing shell due to the weapon's increased muzzle velocity and improved shell penetration; increasing the armor would have increased weight and reduced speed, a compromise that the General Board was not willing to make. In automatic, the drives would follow the bearing and elevation orders of the fire control system. Au début des années 1980, les quatre Iowa furent sortis de la réserve et réintégrèrent la flotte. While the design of the Iowas was too far along to adequately address this issue, experience in the Pacific theater eventually demonstrated that high altitude unguided bombing was ineffective against maneuvering warships.[19][79]. [10], For "fast" battleships, one such design, pursued by the Design Division section of the Bureau of Construction and Repair, was a "cruiser-killer". An aircraft carrier could fan out its airplanes hundreds of miles in all directions searching for an enemy battle fleet. [38] Missouri also received Phalanx fire during a "friendly fire" incident in which the Oliver Hazard Perry-class guided missile frigate USS Jarrett mistook chaff fired by Missouri for a legitimate target and shot at Missouri. Missouri conducted her trials off New York with shakedown and battle practice in Chesapeake Bay before transferring to the Pacific Fleet, where she screened US aircraft carriers involved in offensive operations against the Japanese before reporting to Okinawa to shell the island in advance of the planned landings. When the gun returned to battery, a blast of compressed air was sent down the bore to clean it out. However, the Navy discovered in caisson tests in 1939 that the initial design for this torpedo defense system was actually less effective than the previous design used on the North Carolinas' due to the rigidity of the lower armor belt causing leakage into adjacent compartments. During Operation Desert Storm in 1991, Missouri and Wisconsin fired missiles and 16-inch (406 mm) guns at Iraqi targets. Close by, either in a corner of the handling room or in an adjoining compartment was the upper end of an ammunition hoist from the magazine. Plans for these conversions were dropped in 1984.[97]. [10] The purpose of the Director was to track the target's present bearing and range. L'autonomie obtenue (avec la chauffe au mazout[n. 3]) est de 15 000 milles à vitesse économique (15 nœuds) et de 5 000 milles à vitesse maximale (supérieure à 30 nœuds). (This is similar to power steering on a car.) L'avion tomba dans le sillage du Missouri et explosa. Usage Although the ship would want to reserve as much internal volume as possible for cannon ammunition, the Navy could find the room for a missile silos, each carrying a Tomahawk land attack cruise missile. 1986 :3 × 3 canons de 406 mm10 × 2 canons de 127 mm32 missiles de croisière(BGM-109 Tomahawk)16 missiles mer-mer(RGM-84 Harpoon)4 Phalanx CIWS. The steam is first passed through the HP turbine which turns at up to 2,100 rpm. Illinois was ordered on 9 September 1940, and initially laid down on 6 December 1942. Les grosses pièces d'artillerie dont ils étaient dotés furent malgré tout utiles pour appuyer les nombreuses opérations amphibies menées par les États-Unis durant la guerre du Pacifique puis, dans les conflits suivants, pour des tirs contre la terre à longue distance. Le navire resta inachevé en cale sèche puis le long d'un quai à Newport News. The outer hull was intended to detonate a torpedo, with the outer two compartments absorbing the shock and with any splinters or debris being stopped by the lower armored belt and the empty compartment behind it. The major components of the Mk 37 GFCS were the Mk 37 Director, and the equipment in the plotting room. [37] The original cost for each turret was US$1.4 million, but this figure does not take into account the cost of the guns themselves. "C" was similar but it added 75,000 shp (56,000 kW) (for a total of 300,000 shp (220,000 kW)), to make the original requirement of 35 knots. [142][153] Decommissioned for the last time in 1992, Missouri was donated to the USS Missouri Memorial Association of Pearl Harbor, Hawaii, for use as a museum ship in 1999. The shell weighed 1,900 pounds (862 kg) had an estimated yield of 15 to 20 kilotons of TNT (63,000 to 84,000 GJ),[44] and its introduction made the Iowa-class battleship's 16-inch guns the world's largest nuclear artillery,[45] and made these four battleships the only US Navy ships ever to have nuclear shells for naval guns. When this key was held closed, the Mk 41 was enabled to automatically fire the guns whenever the ship's deck was parallel the horizontal plane. [35], Developed as the final line of defense (terminal defense or point defense) against anti-ship missiles, the Phalanx Close in Weapon System (CIWS, pronounced "sea-whiz") is the anti-aircraft/anti-missile gun currently in use in the US Navy. In keeping with tradition, a 5-inch gun mount on each Iowa-class battleship was manned by the ship's Marine Detachment. [90] This communication suite included the OE-82 antenna for satellite communications,[109] but did not include the Naval Tactical Data System.[90]. 8 APC (Armor-Piercing, Capped) shell weighed 2,700 lb (1225 kg) and was designed to penetrate the hardened steel armor carried by foreign battleships. Cost overruns caused the class to be reduced to three ships. During the Korean War, the battleships provided naval gunfire support (NGFS) for United Nations forces, and in 1968, New Jersey shelled Viet Cong and Vietnam People's Army forces in the Vietnam War. As the powder case cleared the top of the breechblock, the block would rise to seal the chamber. The Iowa-class' main weapons were nine 16 inch guns, which could propel a 2,700 lb shell over 23 miles. [44][N 7] Between 2010 and 2013, the U.S. withdrew the BGM-109A, leaving only conventional munitions packages for its Tomahawk Missile inventory, though the Iowas had been withdrawn from service at that point. Après la guerre du Viêt Nam, il y eut de nouveaux plans de refonte visant à adapter les cuirassés à de nouveaux types d'engagements. Fabriqué en 50 exemplaires à partir de 1956 pour être utilisé par ces cuirassés, il a été retiré du service dès 1962. Between the mid-1940s and the early 1990s, the Iowa-class battleships fought in four major US wars. Sa quille fut posée le 27 juin 1940 et il entra en service le 22 février 1943. The AN/SPS-6 air-search radar system was replaced with the AN/SPS-49 radar set (which also augmented the existing navigation capabilities on the battleships), and the AN/SPS-8 surface-search radar set was replaced by the AN/SPS-67 search radar.
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