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USS United States (CVA-58)
USS ''United States'' (CVA-58) was to be the lead ship of a new design of aircraft carrier. On 29 July 1948, President Harry Truman approved construction of five "supercarriers", for which funds had been provided in the Naval Appropriations Act of 1949. The keel of the first of the five planned postwar carriers was laid down on 18 April 1949 at Newport News Drydock and Shipbuilding.〔 The program was canceled, ''United States'' was not completed, and the other four planned carriers were never built. Nevertheless, USS ''United States'' is the ancestor of all U.S. supercarriers.
== Design ==
The chief proponent for the new large carrier was Admiral Marc Mitscher. He wanted a carrier that would be able to handle the most effective weapons of the day. Early design discussions centered around developing a carrier that would be able to support combat missions using the new jet aircraft. These were faster, larger and significantly heavier than the aircraft the and -class carriers were handling at the end of the Second World War. It was thought that the aircraft carried would have to have longer range to allow the carrier to operate farther away from the target. The deck would have to be able to handle the weight of the heavy jet aircraft landing on the deck. Furthermore, the experience gained against the Kamikazes at the end of the war drove home the need for the ship to have an armoured flight deck. Too many pilots had been lost from kamikaze attack while they were sitting below the wooden flight deck in the pilot ready room. The implication then is that the ship's strength deck would have to be the flight deck rather than the hangar deck, as was the case in the earlier U.S. carriers.〔Cracknell, W.H, Cmdr USN, ''Warship Profile 15, USS Enterprise (CVAN 65) Nuclear Attack Carrier'', p56. Quote: "The main armor carried on Enterprise is the heavy armored flight deck. This was to prove a significant factor in the catastrophic fire and explosions that occurred on Enterprise's flight deck in 1969. The US Navy learned its lesson the hard way during World War II when all its carriers had only armored hangar decks. All attack carriers built since the Midway class have had armored flight decks."〕 That would mean the ship would have a greater tendency to roll in rough weather, as a greater part of the ship's weight would be elevated higher above the waterline.
Based on the size of the aircraft that the new ship was to carry, the design of the carrier was to be flush decked, meaning that the ship would have no island control structure. This was done to create more space for large winged aircraft. The flush-deck design carried with it two major areas of concern. The first was concern over how smoke from the power plants would be diverted away from the flight deck. This had been a major issue with the US Navy's first aircraft carrier, , in the 1920s when carrier development was first underway. The second was the placement of early warning radar equipment to allow the ship to detect incoming attacks. One solution was for a command ship to be close by which would carry the commander of the task force and the early detection radar. The command ship would radio electronic information and orders from its command center over to the carrier. A second was for the ship to carry aircraft that could fly the early warning radar. These would fly overhead and detect approaching aircraft. In truth, the ship as designed would not be able to safely operate by itself, but would need to operate in conjunction with traditional fleet carriers as a complementary bomber-carrier. In fact, the ship was being designed on the basis of the aircraft that it was thought it would carry, and these were based on projections of what aircraft would be in existence in the period 1952 to 1960.
Discussions included debate on the aircraft carrier's mission. One view was that it would carry a group of large bombers that would be secured to the flight deck, with no hangar for these aircraft, as they would be too large to move up and down in an elevator. Though they would be built to carry large, nuclear weapons, the total amount of space used for munition storage would be reduced as multiple strikes would not be likely. A small hangar deck would be available for a limited fighter escort and a small magazine for a small number of heavy nuclear weapons. Another plan was that it could be built with conventional attack capability with a large hangar deck for a large air wing and a large magazine.〔("Why The Navy Wants Supercarriers" ), ''Popular Science'', January 1949, page 115.〕 The nuclear attack supporters won in the initial design stage, but the design was modified to carry more fighters. The flush-deck ''United States'' was designed to launch and recover the 100,000 pound (45 t) aircraft required to carry early-model nuclear weapons, which weighed as much as five tons.〔 The ship would have no permanently raised island or command tower structure. It would be equipped with four aircraft elevators located at the deck edges to avoid decreasing the structural strength of the flight deck. Four catapults would be used to launch aircraft, with two at the bow and two others on the outer edge of the deck staggered back. The carrier was designed so that it could land aircraft at the rear while at the same time launching aircraft from the catapults at the bow and forward area simultaneously. The construction cost of the new ship was estimated at US$189 million (equivalent to US$ billion in ).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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