Brooklyn machinery, fire control, and protection

Eight Babcock & Wilcox boilers and four geared turbines produced about 100,000 shaft horsepower for roughly 32.5 knots. A 10,000-nautical-mile cruising range at 15 knots gave the class the endurance needed for American oceanic operations. Mark 33 and Mark 34 fire-control systems tied the secondary and main batteries to equipment also used across later American cruisers and destroyers. The armament notably omitted torpedo tubes, keeping the design centered on gunnery and reconnaissance rather than a destroyer's strike role. Fitting that machinery, fifteen 6-inch guns, aviation facilities, and substantial magazine and machinery armor into the stated treaty displacement is the engineering achievement highlighted here.