American design for an unprotected cruiser submarine Type 4 (High Speed) dated 23 October 1920

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The Bureau of Construction and Repair was early October 1920 ordered to make a set of designs of submarine cruisers while in the future there could be a need for large submarine scouts. Considered as unattractive. Displacement 8,750 tons and as dimensions 550 (waterline) x 42 (waterline) x 27 feet. Speed 18 knots/13,250 shp. Cruising radius 10 knots/9,000 nautical miles. Armament 2-8” guns, 2-4” anti aircraft guns and 8-21” torpedo tubes (6 fore, 2 aft).

Source

U.S. Naval History and Heritage Command 1911-1925 Spring Styles Book. S-584-164