Photo #: S-511-16 "Heavy Cruiser Study - Scheme 4-A - "Convertible"" 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 10 April 1940, is for a ship of 17,500 tons standard displacement, with a main battery of twelve 8"/55 guns (convertible to six 12"/50 guns in twin turrets, mounted in the 1st, 2nd and 4th barbettes), a secondary battery of twelve 5"/38 guns and a 120,000 horsepower powerplant for a speed of 33.1 knots. Ship's dimensions are: waterline length 710'; beam 74.5'; draft 24.7'. Scale of the original drawings is 1/32" = 1'. The design would be similar if fitted with six 12"/50 guns (Scheme 4B), but displacement rises to 17850 tons, draft increases to 25 feet, speed drops to 33.0 knots and the ship would trim down 2.4 feet by the head. 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: 817KB; 3000 x 1825 pixels