In October 1920 asked the Chief of the Bureau of Construction and Repair his staff to come with a set of plans for an unprotected heavily gunned cruiser submarine or submarine scout which was to taken aircraft with her and with a huge diving depth. This design was however never realized afraid as the Bureau was that if she was flooded the risk was too large that she would not survive due the large aircraft storage tubes topside.
Normal displacement 10.000 tons and as dimensions 400’0”(waterline/over al) x 46 (moulded on waterline)-48 (extreme on waterline) x 33’3”/ Freeboard maximum at stem 18’0”, at A.P. 5’0”and at side M.P. 12’0”. Total depth at M.P. measured at of uppermost strength DK 43’0”. Coefficients at normal displacement of 10.000 tons longitudinal .65, block .52, midship .80, water plane .78 and displacement-length 148.5. Metracentric heights GM=surface, hangars flooded=1.4’, “BG” submerged hangars intact=2.8’and “BG” submerged hangars flooded=0.5
Normal displacement ready to dive 10.000 tons: hull 3.800 tons, hull fitings 700 ton. Steam engineering 1.500 tons, battery 853 tons, ammunition 273 tons, equipment 150 tons, outfit and stores 482 tons, fuel oil, fuel supply 1/000 tons, margin 592 tons, lead ballast 400 tons, water in safety TK&WRT 50 tons and water in auxiliary tanks 200 tons.
Machinery consisted of 4-1.400 bhp diesels driving generators and 4 main motors. Speed 14 knots with 5.600 shp. Range with a speed of 10 knots 16.000 miles.
The armament consisted of 2x3& 1x2-8” guns (1x3&1-2 super firing turrets before the sail and 1x3 turret aft the sail), 2-4” anti aircraft guns (on the sail)and 8-21” torpedo tubes (6xbow, 2xstern). The catapult was located between the sail and the aft gun turret.
Source
The so-called Spring Styles Book 1 (March 1911-September 1925). Naval History and Heritage Command. Lot S-584-163. 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 was presented to the General Board which advices the Secretary of the Navy.
