I had done a design study for fast French armoured cruisers

Back in the early 1970's, I had done a design study for very fast French armoured cruisers to be named:

• Dunkerque
• Strasbourg
• Jean Bart
• Richelieu
• Gascogne
• Clemenceau

I had designed a short version and then realized that for higher speed, the length needed to be expanded to 729ft from 676ft. The armament is 6-9.4in (25 ton) BLR and 8-4in QF guns. The above water torpedo armament is 6-21in TT. the armour belt is 8in, although it is just 8ft tall. This is the Springsharp report:

F/CA/1917 , France Armored Cruiser laid down 1917 (Engine 1950)

Displacement:
 17,729 t light; 18,302 t standard; 19,250 t normal; 20,009 t full load

Dimensions: Length overall / water x beam x draught
 730.15 ft / 729.00 ft x 75.00 ft x 27.00 ft (normal load)
 222.55 m / 222.20 m x 22.86 m  x 8.23 m

Armament:
      6 - 9.40" / 239 mm guns (2x3 guns), 415.29lbs / 188.37kg shells, 1917 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1917 Model
   Quick firing guns in deck mounts with hoists
   on side, all aft
 Weight of broadside 2,748 lbs / 1,246 kg
 Shells per gun, main battery: 120
 6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 495.00 ft / 150.88 m 8.00 ft / 2.44 m
 Ends: Unarmoured
   Main Belt covers 104 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 495.00 ft / 150.88 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 183,690 shp / 137,033 Kw = 36.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 1,707 tons

Complement:
 816 - 1,062

Cost:
 £2.771 million / $11.086 million

Distribution of weights at normal displacement:
 Armament: 343 tons, 1.8 %
 Armour: 4,505 tons, 23.4 %
    - Belts: 1,310 tons, 6.8 %
    - Torpedo bulkhead: 403 tons, 2.1 %
    - Armament: 723 tons, 3.8 %
    - Armour Deck: 1,946 tons, 10.1 %
    - Conning Tower: 124 tons, 0.6 %
 Machinery: 4,395 tons, 22.8 %
 Hull, fittings & equipment: 8,487 tons, 44.1 %
 Fuel, ammunition & stores: 1,521 tons, 7.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   28,411 lbs / 12,887 Kg = 68.4 x 9.4 " / 239 mm shells or 3.4 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.8 ft / 1.2 m
 Roll period: 16.1 seconds
 Steadiness - As gun platform (Average = 50 %): 72 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.44

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.456
 Length to Beam Ratio: 9.72 : 1
 'Natural speed' for length: 27.00 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (75 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 28.24 ft / 8.61 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 120.2 %
  - Above water (accommodation/working, high = better): 217.6 %
 Waterplane Area: 35,060 Square feet or 3,257 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 136 lbs/sq ft or 663 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.18
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily