American Senator Tillman hypothectical design 70,000 tons battleship dated 13 December 1916

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Design as result of senator Tillman requesting for a battleship of maximum size and strenght able to use the Panama Canal and existing harbor facilities. Never realized.

Dimensions 975 (waterline)-995.0 (over all) x 103 (waterline)-105.6 (molded on waterline)-108.0 (extreme) on waterline x 32.9 feet and a displacement of 70,000 tons. Freeboard maximum stem and A.P. 29’6”, at side M.P. 28’6”. Total depth at M.P. 62’0”. Deck height 2nd 10, 3 rd 9 and 4th 8. Metacenter above base 43.’, C. of G above Base 39.6’, G.M. 3.9’. Tons per inch immersion 19.2. Coefficients as notmal displacement of 70,000 tons: longitudinal .717-block .711-midship .99-water plane .764 and displacement-length 76.6.

Speed 26,5 knots/65,000 ehp. Range 12,000 nautical miles/10 knots. Electric drive propulsion.

Weights normal condition=70,000 tons:

Hull 31,813

Hull fittings (including 800 tons for gyro-stabilizers)3,000

Protection 15,621

Steam engineering 5,000

Reserve feed 900

Battery 5,197

Ammunition 3,546

Equipment 775

Outfit and 2/3 stores 11,000

Fuel oil 2/3 supply 2,000

Margin 48

Lenght of compartments boiler room-24’-air compressor róoms 24’, engineroom 84’-pomp rooms 12’-total machinery space 276’-motor rooms 48’.

Costs: hull 17,200,000-machinery 7,700,000-total C.&M. 24,900,000.

Armament 24-16" cal 50 guns, 21-5" quick firing guns (torpedo defence battery), 3 high power anti aircraft guns and 4-21 torpedo tubes.

Main side belt armor with an extreme width of 19 8 1/2", depth below water line 9'0" and thickness 13"-13"-7".

Barbettes 12 1/1"(heavy part thickness)-4" (light part thickness).

Turrets 13 (port)-10'9" (sides)-5' (top)-9" (rear).

Conning tower proper 16" and top 8" and tube heavy part 16"and light part 6".

Uptake protection 10"-7"-5".

Protective deck total middle 3" after 5".

Note

1. Benjamin Ryan Tillman (11 August 1847-3 July 1918), Democratic Party plotician, governor of South Craolina 1890-1894 and sentaor 1895-1918. See for instance: Construction of battleships. Remarks of Hon. Benjamin R. Tillman,... relative to the construction of 60,000-ton battleships; also copy of a Senate resolution instructing the Committee on Naval Affairs to make an investigation of the matter, together with an article entitled "Build the Limit," by Commander W.A. Moffett, United States Navy. Presented by Mr. Tillman. June 20, 1916.

Source

S. Naval History and Heritage Command. Bureau of Ships Spring Styles Book 1 1911-1925. S-584-108 preliminary design 171.