|Tonnage||10,300 tons standard displacement
|Dimensions||610'4" by 66'1" by 21'
186.03m by 20.14m by 6.40m
|Maximum speed||32.7 knots|
|Armament||9 8"/55 guns
8 5"/25 AA guns
8 0.50 machine guns
|Protection||3" (76mm) belt (machinery)
5.75"(146mm) belt (magazines)
2.5" (64mm) deck
2.125" (54mm) magazine crowns
||4-shaft Parsons geared
turbine (107,000 shp)
8 Yarrow boilers
|Bunkerage||2125 tons fuel oil|
|Range||10,000 nautical miles (19,000 km) at 15 knots|
1944: 20mm armament increased to 17-19 guns. One catapult landed and aircraft complement reduced to 2-3 aircraft.
The Portlands were completed in 1932-1933 and their design reflected the 1930 London Naval Treaty. The first group of ships of the 1929 naval program of 15 heavy cruisers were originally to be repeat Northamptons. However, this design was somewhat underweight relative to the treaty restrictions, and the newly imposed limits on total numbers of cruisers discouraged the building of second-class units. There was also a desire to develop a cruiser with better protection and with the range to counter German-style commerce raiders. Since three of the ships were being built in Navy yards, where major design changes in the midst of construction would not incur a large cash penalty, it was decided to modify two of on the ways with some of the desired improvements. Increasing the side belt was prohibitively expensive, but fairly heavy armor was placed around the magazines. The third ship was completed as Wichita.
The ships ended up rather top heavy, which caused them to roll badly, and Indianapolis capsized after a single torpedo hit.
|Task Force 3 (Brown) at Johnston Island||Torpedoed 1945-7-30 by I-58|
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