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DEPARTMENT OF THE NAVY -- NAVAL HISTORICAL CENTER
805 KIDDER BREESE SE -- WASHINGTON NAVY YARD
WASHINGTON DC 20374-5060

Online Library of Selected Images -- Picture Data

Photo #: S-511-17 (complete caption)

"12-Inch Gun Cruiser Study, CA2F"
(with hull sections for Schemes CA2E & F, G, H & I)

Preliminary design plan prepared for the General Board as part of the process leading to the Alaska class (CB1-6) large cruiser design.
This plan, dated 19 June 1940, is for a ship (CA2F) of 24,700 tons standard displacement and 28,300 tons trial displacement, with a main battery of seven 12"/50 guns, a secondary battery of twelve 5"/38 guns, and a 150,000 horsepower powerplant for a speed of 33 knots. Ship's dimensions are: waterline length 750'; beam 84'; draft 29'.
Scale of the original plan and side elevation drawings is 1/32" = 1'.
The hull sections (original scale 1/16" = 1') represent anti-torpedo side protection alternatives, resulting in differing hull sizes, main batteries, powerplants, speeds and other features:
CA2E (standard displacement 24,100 tons, 740' length, and six 12" guns. Otherwise as CA2F) & CA2F with double bottom extending upward to a single inboard bulkhead;
CA2G with triple bottom extending upward to two inboard bulkheads (standard displacement 27,500 tons, 790' length, 86' beam, 30' draft, and eight 12" guns); and
CA2H & CA2I with triple bottom and four inboard bulkheads, plus improved armor protection. CA2H would have had a 27,500 ton standard displacement, 790' length, 87' beam, 29' draft, 100,000 HP powerplant for 30.5 knots, and nine 12" guns. CA2I would have been similar, but with 86' beam, 120,000 HP for 31.5 knots, and seven 12" guns.

The original plan is in the 1939-1944 "Spring Styles Book" held by the Naval Historical Center.

U.S. Naval Historical Center Photograph.

Online Image: 630KB; 3000 x 1670 pixels

 

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Image posted 25 February 2000
Rescanned and reposted 1 March 2005