The Ger/CA/1909 armoured cruiser

The next page in the Blue Book shows the armouring scheme for a version of the Ger/CA/1909 armoured cruiser. The ship is rather archaic-looking. It is very much an armoured cruiser, along the lines of the Blücher, except with 6-12in guns. The thickest armour is very restricted. These are the original specifications:

Ger/CA/1909  550ft x 80ft x 25ft  Cp=0.56  Cm=0.95
Standard Displacement=16,860 tons  25 knots
6-12in/50  8-6in QF guns  
Weights:
Mach= 20.6% = 3,461 tons
Arm=   5.3% =   920 tons
Prot= 21.1% = 3,649 tons
Misc=  8.0% = 1,350 tons
Hull= 45.0% = 7,480 tons

This is the Springsharp report for what I implemented:

Ger/CA/1909, Germany Armoured Cruiser laid down 1909

Displacement:
 15,892 t light; 16,570 t standard; 18,400 t normal; 19,864 t full load

Dimensions: Length overall / water x beam x draught
 550.00 ft / 550.00 ft x 80.00 ft x 25.00 ft (normal load)
 167.64 m / 167.64 m x 24.38 m  x 7.62 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1909 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1909 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
   8 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 140.00 ft / 42.67 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 410.00 ft / 124.97 m 0.00 ft / 0.00 m
 Upper: 4.00" / 102 mm 325.00 ft / 99.06 m 8.00 ft / 2.44 m
   Main Belt covers 39 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 325.00 ft / 99.06 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 4.00" / 102 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 81,270 shp / 60,627 Kw = 28.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 3,294 tons

Complement:
 789 - 1,026

Cost:
 £1.708 million / $6.834 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 4.1 %
 Armour: 4,294 tons, 23.3 %
    - Belts: 968 tons, 5.3 %
    - Torpedo bulkhead: 451 tons, 2.5 %
    - Armament: 992 tons, 5.4 %
    - Armour Deck: 1,762 tons, 9.6 %
    - Conning Tower: 120 tons, 0.7 %
 Machinery: 3,694 tons, 20.1 %
 Hull, fittings & equipment: 7,149 tons, 38.9 %
 Fuel, ammunition & stores: 2,508 tons, 13.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,203 lbs / 10,978 Kg = 28.0 x 12.0 " / 305 mm shells or 3.1 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.65
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.585
 Length to Beam Ratio: 6.88 : 1
 'Natural speed' for length: 23.45 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 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 %): 29.00 ft / 8.84 m
    - Mid (67 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 26.52 ft / 8.08 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 128.0 %
  - Above water (accommodation/working, high = better): 205.3 %
 Waterplane Area: 31,746 Square feet or 2,949 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 146 lbs/sq ft or 710 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.91
  - Longitudinal: 2.41
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily