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fighting ships of the world

UNITED STATES NAVY (UNITED STATES OF AMERICA)

CRUISERS

PORTLAND heavy cruisers (1932-1933)

Indianapolis 1945

No Name Builder Laid down Launched Comm Fate
CA33 Portland Bethlehem, Quincy 17/2/1930 21/5/1932 23/2/1933 stricken 3/1959
CA35 Indianapolis New York SB, Camden 31/3/1930 7/11/1931 15/11/1932 sunk 29/7/1945
  

Displacement standard, t

10258

Displacement full, t

12755

Length, m

180.4 wl 185.9 oa

Breadth, m

20.1

Draught, m

6.40 full load

No of shafts

4

Machinery

Parsons geared steam turbines, 8 Yarrow boilers

Power, h. p.

107000

Max speed, kts

32.5

Fuel, t

oil 1417 - 2125

Endurance, nm (kts) 10000 (15)

Armour, mm

belt: 146 - 83, bulkheads: 32 - 25, deck: 64 - 54, barbettes: 38, turrets: 64 - 19, CT: 32

Armament

3 x 3 - 203/55 Mk 9/10/11/13/14, 8 x 1 - 127/25 Mk 10/11/13, 8 1 - 12.7/90, 2 catapults, 4 seaplanes (OL, O2U, O3U)

Complement

CA33: 807

CA35: 917 inc flag

Ship project history: The original project of Portland class cruisers, approved in 1929, represented almost exact copy of cruisers of Northampton class, differing only by on 3m bigger hull length. It was planed to build five ships (CL32-36, subsequently the index was replaced to ). Already after the statement of the project of new cruisers it was found out, that their prototype, Northampton, was underloaded and it is possible to use a stock of displacement for protection increasing. In this connection it had decided to limit a class by only two ships under the redesigned project, and built other ships on new one (future New Orleans class).

Redesigning of the project of Portland class has turned into increasing of thickness of a deck over machinery and better protection of magazines. These innovations have allowed to ensure more reliable protection of machinery against fire of 152mm guns, and for the first time American ships had immune zone under fire of 203mm guns, the truth, it concerned magazines only (fore magazines between 60 and 115 cables, and aft ones between 60 and 102 cables).

Besides more reliable protection, Portland class cruisers differed from predecessors by absence of TTs and doubled number of 127mm AA guns.

Ship protection: Main belt extended to 1.5m below and 3m over waterline. Middle part of belt abreast machinery was 127mm thick (83mm at lower edge) on 19mm STS plating and end parts abreast magazines were 146mm. Belt was closed by 64mm bulkheads and middle and end parts were separated by 25mm bulkheads. Armoured deck over main belt was 54mm thick over magazines and 64mm over machinery. Barbettes were 38mm thick. Turrets had 64mm faces, 25mm sides, 19mm rears and 51mm crowns.

Modernizations: early 1942, both: - 8 x 1 -12.7/90; + 4 x 4 - 28/75 Mk 1, 12 x 1 - 20/70 Mk 4, SC, Mk 3, Mk 4 radars

5/1943, both: - 4 x 4 - 28/75, SC radar, 1 catapult; + 4 x 4 - 40/56 Mk 1/2, SG, SK radars. Portland can carry 2 seaplanes and Indianapolis 3.

autumn 1944, both: - Mk 3, Mk 4 radars; + Mk 8, Mk 18 radars

1944 - 1945, Portland: + 4 x 2 - 40/56 Mk 1/2, 5 x 1 - 20/70 Mk 4

1944 - 1945, Indianapolis: - 12 x 1 - 20/70; + 2 x 4 - 40/56 Mk 1/2, 8 x 2 - 20/70 Mk 4, full displacement was more than 15000t

1/1946, Portland: 3 x 3 - 203/55 Mk 14, 8 x 1 - 127/25 Mk 19, 4 x 4 - 40/60 Mk 2, 4 x 2 - 40/60 Mk 1, 17 x 1 - 20/70 Mk 10, 1 catapult, 2 seaplanes, SG, SK, Mk 8, Mk 18 radars

Naval service: Indianapolis was badly damaged 30/3/1945 by kamikaze and repaired till July, 1945; 30/7/1945 she was sunk by three torpedoes from Japanese submarine I58 in Philippine Sea. Portland 13/11/1942 in battle at Guadalcanal has received one torpedo hit from Japanese ships, badly damaged and was under repair till May, 1943.

Indianapolis 1945

Ivan Gogin, 2014-15