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SCB-27
SCB-27, or "Two Seven-Alpha"/"Two Seven-Charlie," was the United States Navy designation for a series of upgrades to the s (both the short-hull and long-hull (''Ticonderoga'') versions), conducted between 1947 and 1955. These upgrades were intended to allow the World War II-era carriers to operate jet aircraft.
==Modifications==
Officially, Ship Characteristics Board Program 27 proper referred to the completion of , left unfinished at war's end, to a heavily revised design; reconstructions of earlier ships were programs SCB-27A and 27C. The SCB-27 modernization was very extensive, requiring some two years for each carrier. To handle the much heavier, faster aircraft of the early jet-era, the flight deck structure was significantly reinforced, able to support aircraft weighing up to , namely the North American AJ Savage. Stronger and larger elevators, much more powerful catapults, and new Mk 5 arresting gear were installed. The original four twin 5-inch/38 gun mounts were removed, clearing the flight deck of guns. The new five-inch gun battery consisted of eight weapons, two on each quarter beside the flight deck. Twin 3-inch/50 gun mounts replaced the 40 mm guns, offering much greater effectiveness through the use of proximity fuzed ammunition. The reconstruction eliminated the difference between "short-hull" and "long-hull" ships; all now had similar clipper bows.
The island was completely redesigned, made taller, but shorter in overall length with the removal of its gun mounts. In addition, the boiler uptakes were rebuilt and angled aft to accommodate a single radar and communications mast atop the island. To better protect aircrews, ready rooms were moved from the gallery deck to below the armored hangar deck, with a large escalator on the starboard side amidships to move flight crews up to the flight deck. Internally, aviation fuel capacity was increased to (a 50% increase) and its pumping capacity enhanced to per minute. Fire fighting capabilities were enhanced through the addition of two emergency fire and splinter bulkheads to the hangar deck, a fog/foam firefighting system, improved water curtains and a cupronickel fire main. Also improved were electrical generating power, and weapons stowage and handling facilities. All this added considerable weight: displacement increased by some twenty percent. The armor belt was removed and blisters were fitted to the hull sides to compensate, widening waterline beam by . The ships also sat lower in the water, and maximum speed was slightly reduced, to .
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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