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Tuesday 3 August 2021

Preliminary design for an American scout cruiser dated 4 March 1921


Drawing S-584-175 considered to be large to be affordable although it was used as a basic design for 5 alternatives. The ideas were later used in designing the 11.512 long tons full load Pensacola heavy cruiser-class of the Fiscal Year 1926.Dimensions 610 (on water line) x 57.0 (on waterline) x20.75 feet and a displacement of 10.750 ton. Metacenter above base 24,15, C. of G. above base 20,39 and GM 3,76. Freeboard maximum at stem 29.0 and at AP 14.0 feet. Total depth at MP measured at of uppermost strength DK 36 feet. Displacement normal 10.750 ton: hull (not protected) 4.465 ton, hull fittings 528 ton, protection (a11) 1.335 ton, steam engineering 1.632 ton, reserve feed 2/3 100 ton, battery 400 ton, ammunition 247 ton, equipment 242 ton, outfit and 2/3 stores 322 ton, fuel oil 2/3 full supply 950 ton and margin 529 ton. Coefficients at normal displacement longitudinal 0.58, midship 0.915 and displacement-length 47.4. The red. gear driven turbines and 12 boilers divided over 4 boiler rooms were to supply 48.000 ehp allowing a speed of 33 knots and with a speed of 10 knots a range of 8.000 nautical miles. The armament was to consist pf 4x2-8.8” guns, 4-5” anti aircraft guns and 2x3-21” torpedo tubes. Barbettes were not protected, the conning tower by 80” thick armour. Further more a protective deck and over the magazine a splinter deck both 3” thick.

Source the so-called Spring Styles Book 1 (March 1911-September 1925). Naval History and Heritage Command. Lot S-584. Preliminary designs prepared by mostly civilians working at the Bureau of Construction and Repair (succeeded by the Bureau of Ships nowadays the Naval Sea Systems Command) under supervision of naval architects of the Navy Construction Corps. A major part of the drawings is presented to the General Board which adviced the Secretary of the Navy.