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Concept
Lexington-class battlecruiser
Summary
The Lexington-class battlecruisers were officially the only class of battlecruiser to ever be ordered by the United States Navy. While these six vessels were requested in 1911 as a reaction to the building by Japan of the , the potential use for them in the U.S. Navy came from a series of studies by the Naval War College which stretched over several years and predated the existence of the first battlecruiser, (a series of proposed battlecruiser designs was in fact submitted to the General Board in 1909 but was not approved for construction). The fact they were not approved by Congress at the time of their initial request was due to political, not military considerations.
The Lexingtons were included as part of the Naval Act of 1916. Like the battleships also included in the 1916 Act, their construction was repeatedly postponed in favor of escort ships and anti-submarine vessels. During these delays, the class was redesigned several times; they were originally designed to mount ten 14-inch guns and eighteen five-inch guns on a hull with a maximum speed of , but by the time of the definitive design, these specifications had been altered to eight 16-inch guns and sixteen six-inch guns, with a speed of to improve hitting power and armor (the decrease in speed was mostly attributed to the additions of armor).
The design challenges the Navy's Bureau of Construction and Repair (C&R) faced with this class were considerable, as the combined requirements of optimum hitting power, extreme speed and adequate protection taxed the knowledge of its naval architects and the technology of the time. The desired speed of 35 knots had been attained previously only in destroyers and smaller craft. To do so with a capital ship required a hull and a power plant of unprecedented size for a U.S. naval vessel and careful planning on the part of its designers to ensure it would have enough longitudinal strength to withstand bending forces underway and the added stresses on its structure associated with combat.
Official source
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