Another look at the Ger/BB/1915 CDV

Back in 1971, we were very aware of the apparent uses of coast defense battleships. I had designed the Ger/BB/1915 CDV to be sort of a modern "pre-dreadnought". The original design was actually to conservative. The Springsharp design is actually more capable, although I suppose that part of the reason is that the protection is somewhat less than the original design weight of 14,970 tons. This is the Springsharp report:

Ger/BB/1915 CDV, Germany Coast Defense Battleship laid down 1915

Displacement:
 25,503 t light; 26,575 t standard; 28,000 t normal; 29,140 t full load

Dimensions: Length overall / water x beam x draught
 585.00 ft / 585.00 ft x 100.00 ft x 29.10 ft (normal load)
 178.31 m / 178.31 m x 30.48 m  x 8.87 m

Armament:
      4 - 18.00" / 457 mm guns (2x2 guns), 2,916.00lbs / 1,322.68kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 12,914 lbs / 5,858 kg
 Shells per gun, main battery: 70

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 400.00 ft / 121.92 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 105 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 400.00 ft / 121.92 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 66,211 shp / 49,393 Kw = 25.00 kts
 Range 4,250nm at 15.00 kts
 Bunker at max displacement = 2,565 tons

Complement:
 1,081 - 1,406

Cost:
 £3.781 million / $15.126 million

Distribution of weights at normal displacement:
 Armament: 1,614 tons, 5.8 %
 Armour: 10,282 tons, 36.7 %
    - Belts: 3,555 tons, 12.7 %
    - Torpedo bulkhead: 1,199 tons, 4.3 %
    - Armament: 2,194 tons, 7.8 %
    - Armour Deck: 3,095 tons, 11.1 %
    - Conning Tower: 238 tons, 0.9 %
 Machinery: 2,508 tons, 9.0 %
 Hull, fittings & equipment: 11,099 tons, 39.6 %
 Fuel, ammunition & stores: 2,497 tons, 8.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   40,419 lbs / 18,334 Kg = 13.9 x 18.0 " / 457 mm shells or 7.1 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 6.5 ft / 2.0 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.58
 Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.576
 Length to Beam Ratio: 5.85 : 1
 'Natural speed' for length: 24.19 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (50 %):  22.00 ft / 6.71 m
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 22.24 ft / 6.78 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 89.9 %
  - Above water (accommodation/working, high = better): 162.1 %
 Waterplane Area: 41,822 Square feet or 3,885 Square metres
 Displacement factor (Displacement / loading): 99 %
 Structure weight / hull surface area: 191 lbs/sq ft or 930 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.07
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily