Photo #: S-584-166
"Cruiser Submarine Type # 2 -- Armored" ... October 23, 1920
Preliminary design plan for a "Cruiser Submarine" (Type # 2 -- Armored). The Chief of the Bureau of Construction and Repair requested in early October 1920 that his staff develop a set of comparative studies for ships of this type, apparently reflecting his desire to anticipate a possible need for large submarine scouts for transoceanic operations. Type # 2 incorporated 474 tons of armor protection but a bureau design report considered it "very vulnerable to torpedo attack" because it lacked the side protection system in Type # 3 (see Photo # S-584-165). The concept was not pursued.
This plan provided eight 8-inch guns, diesel machinery, and a surface speed of 15.5 knots in a ship 490 feet long on the waterline, 60 feet in beam, and with a normal surface displacement of 13,500 tons.
Note: The original document was ink on linen (black on white).
The original plan is in the 1911-1925 "Spring Styles Book".
U.S. Naval Historical Center Photograph.
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Image posted 3 February 2008