The US/CA/1933 design

I hope that it goes without saying that the design series that I have been presenting are based on the premise of no Washington Naval Treaty, or any other limitation. The US/CA/1933 design now has ballooned to 18,800 tons normal, in order to reach 35 knots and still have adequate strength and seakeeping. It still seems that the US did not have an adequate light AA armament in this period. The first attempt at a better answer was the 1.1in MG gun, which is generally comparable to the Japanese 25mm gun. That was not really a mature weapon, and anyway, was too light. Oddly, the ultimate answer was to adopt the 20mm Oerlikon and the 40mm Bofors guns. This is the Springsharp report:

US/CA/1933, United States Heavy Cruiser laid down 1933 (Engine 1939)

Displacement:
16,435 t light; 17,056 t standard; 18,800 t normal; 20,195 t full load

Dimensions: Length overall / water x beam x draught
669.71 ft / 665.00 ft x 65.00 ft x 24.00 ft (normal load)
204.13 m / 202.69 m x 19.81 m  x 7.32 m

Armament:
     12 - 8.00" / 203 mm guns (4 mounts), 256.00lbs / 116.12kg shells, 1933 Model
  Breech loading guns in turrets (on barbettes)
  on centreline ends, evenly spread, 4 raised guns - superfiring
     8 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1933 Model
  Anti-aircraft guns in deck mounts with hoists
  on side, all amidships
     16 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1933 Model
  Machine guns in deck mounts
  on side, all amidships, all raised mounts - superfiring
Weight of broadside 3,573 lbs / 1,621 kg
Shells per gun, main battery: 120
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
  - Belts:  Width (max) Length (avg)  Height (avg)
Main: 4.00" / 102 mm 650.00 ft / 198.12 m 16.00 ft / 4.88 m
Ends: Unarmoured
  Main Belt covers 150 % of normal length

  - Torpedo Bulkhead:
 1.00" / 25 mm 650.00 ft / 198.12 m 23.00 ft / 7.01 m

  - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 2.00" / 51 mm  2.00" / 51 mm

  - Armour deck: 3.00" / 76 mm, Conning tower: 4.00" / 102 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 181,511 shp / 135,407 Kw = 35.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 3,138 tons

Complement:
802 - 1,043

Cost:
£7.743 million / $30.972 million

Distribution of weights at normal displacement:
Armament: 447 tons, 2.4 %
Armour: 4,400 tons, 23.4 %
   - Belts: 1,625 tons, 8.6 %
   - Torpedo bulkhead: 553 tons, 2.9 %
   - Armament: 349 tons, 1.9 %
   - Armour Deck: 1,811 tons, 9.6 %
   - Conning Tower: 61 tons, 0.3 %
Machinery: 4,911 tons, 26.1 %
Hull, fittings & equipment: 6,678 tons, 35.5 %
Fuel, ammunition & stores: 2,365 tons, 12.6 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
  21,573 lbs / 9,786 Kg = 84.3 x 8.0 " / 203 mm shells or 2.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 3.6 ft / 1.1 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
  - Recoil effect (Restricted arc if above 1.00): 0.71
Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.634
Length to Beam Ratio: 10.23 : 1
'Natural speed' for length: 25.79 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
   - Stem:  31.00 ft / 9.45 m
   - Forecastle (20 %): 27.00 ft / 8.23 m
   - Mid (67 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
   - Quarterdeck (15 %): 19.00 ft / 5.79 m
   - Stern:  19.00 ft / 5.79 m
   - Average freeboard: 24.68 ft / 7.52 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 148.9 %
 - Above water (accommodation/working, high = better): 167.6 %
Waterplane Area: 32,637 Square feet or 3,032 Square metres
Displacement factor (Displacement / loading): 106 %
Structure weight / hull surface area: 120 lbs/sq ft or 586 Kg/sq metre
Hull strength (Relative):
 - Cross-sectional: 0.95
 - Longitudinal: 1.61
 - Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent