New Orleans Class Cruisers
By Lester Abbey
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New Orleans Class Cruisers - Lester Abbey
References
Design History
In 1922 all the major naval powers signed up to the Washington Treaty, an agreement designed to stop the kind of competitive naval building programs that had preceded the First World War. This treaty limited the number of battleships and total naval tonnage that each country could build, but it also defined the upper limits of tonnage and armament for each major warship type. For cruisers maximum gun size was 8in and displacement was not to exceed 10,000 tons. Having just signed a treaty intended to halt naval competition, all of the signatories then set about building to the maximum limits. With the building of battleships forbidden for ten years the focus was on cruisers. The naval race was on again, with 10,000-ton 8in gun cruisers as the new measure of naval supremacy.
Paradoxically, in most navies the cruiser function was better suited to smaller ships with quick-firing 6in guns that could be built more cheaply and in greater quantities. The 8in cruiser, later called a Heavy Cruiser (as opposed to the 6in gunned Light Cruisers), was therefore created as a result of treaty restrictions rather than actual need. In fact, only the US and Japan had any real need for large cruisers – because of the long distances involved in the Pacific theatre. A large cruiser could carry the extra fuel needed for greater range.
Initially the United States built ten treaty cruisers to a similar concept: 10,000 tons, 600ft long, nine or ten 8in guns, 5in/25cal secondary armament, 32 knots speed, but lightly armoured and not well protected. These types generally matched what the other navies were building but because of their flimsy protection they were not ideal ships. By the 1930s the initial excitement of building what came to be called ‘Treaty cruisers’ had calmed down. With the exception of the United States and Japan other countries started building the more useful 6in types for scouting and screening duties. The United States and Japan, however, continued building heavy cruisers and a ‘second generation’ of this type was embarked upon. The New Orleans class was the first of this second generation of Treaty cruisers. They formed a bridge between the original ten and the sophisticated war-built Baltimore class. They were slightly shorter than their predecessors but more robust. They were much more heavily armoured and the armour was distributed more effectively.
The General Board of Naval Construction wanted a more resilient type of heavy cruiser. Five ships had already been authorised by Congress and two of them were already under construction to a modified first generation design. The other three were not started until a very different design was ready. This design was shorter, with the required thicker armour and improved scheme of protection. This more compact arrangement was made at the sacrifice of the unit principle of propulsion. The unit principle (used in previous and subsequent classes) grouped a set of boilers with a turbine room and another set of boilers with another turbine room. The idea was that a single hit should not disable the ship’s entire propulsion system by destroying either all of the boilers or the turbines. The New Orleans class had all of the boilers forward, which enabled a closer grouping of the stacks (and more room aft for aircraft handling) and the turbines in one large area under the hangars. This meant that a single lucky hit could indeed disable the ship’s propulsion system – but this sacrifice was made so that a shorter but much thicker armour belt could be included.
A view of the Astoria before the war. One can see the purposeful lines, the stacks forward and the large well-deck behind them that distinguished this class from its predecessors.
DESIGN CHARACTERISTICS
Compare the 8in turret on the Tuscaloosa (left) with that of the previous classes – in this case the Chicago. Also note the ship number atop turret No 3.
The New Orleans design was heavily influenced by the ‘gun lobby’, an influential group of admirals who felt that gunfire was the ultimate weapon and that emphasis on surface gunnery would be the decider in battle situations. Weapons such as torpedoes, mines and aerial bombs were secondary in importance. The gun lobby also believed that any likely opponents were similarly minded and that future conflict would be decided by ships of like type slugging it out using their main armament as the arbiter. As a result the New Orleans class were better protected against medium-calibre gunfire at the expense of protection against mines and plunging projectiles such as bombs and very long range gunfire. They were expected to get close to enemy heavy cruisers and survive.
A view of the San Francisco’s portside 5in/25cal secondary armament. Note the large opening in the breech for fast loading.
8-INCH 55-CALIBRE GUN MARK 12
Their armament reflected this: nine 8in guns mounted in a well armoured turret rather than the lightly protected gunhouses of the previous classes. These turrets allowed individual elevation of each gun and, although smaller, were so arranged for more rapid fire. The secondary armament of eight 5in/25cal remained the same as the previous classes but it was located forward and had superior fire control. The 5in/25 was a dual-purpose weapon – used for surface action and against aircraft. True to the tenets of the gunnery lobby this was the first class of Treaty cruisers designed without torpedo tubes. Previous classes had included torpedo tubes in their design although they were later removed. Initially there were also eight .50-calibre machine guns for AA purposes, but as time went on the AA armament was increased considerably. The 50cal machine guns were too light and were replaced by 20mm Oerlikon machine