The original Ger/CB/1905 concept

I was surprised to find that the "original concept" for the Ger/CB/1905 light battlecruiser envisioned a speed of 30 knots, not 31 knots. I may have raised my sights shortly after that, but the original was designed for 30 knots. I created a faithful Springsharp design, using the protection plan in an early pencil drawing. The two changes that I made were to increase the displacement and to increase the draft. In any case, I suspect that my original 19,000 tons was a Standard displacement, not a normal displacement. Otherwise, the design worked, at least with moderately lightweight machinery:

Ger/CB/1905 Original version, Germany Battlecruiser laid down 1905 (Engine 1907)

Displacement:
 18,888 t light; 19,530 t standard; 21,702 t normal; 23,439 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (705.00 ft / 700.00 ft) x 80.00 ft x (25.40 / 26.98 ft)
 (214.88 m / 213.36 m) x 24.38 m  x (7.74 / 8.22 m)

Armament:
      4 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1905 Model
   2 x Twin mounts on centreline ends, evenly spread
  2 raised mounts
      12 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1905 Model
   12 x Twin mounts on sides, evenly spread
 Weight of broadside 3,892 lbs / 3,892 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 385.00 ft / 117.35 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 3.00" / 76 mm 385.00 ft / 117.35 m 8.00 ft / 2.44 m
   Main Belt covers 85 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 385.00 ft / 117.35 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 4.00" / 102 mm  8.00" / 203 mm
 2nd: 3.00" / 76 mm 2.00" / 51 mm  3.00" / 76 mm

   - Armour deck: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 101,867 shp / 75,993 Kw = 30.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 3,908 tons

Complement:
 893 - 1,162

Cost:
 £1.840 million / $7.362 million

Distribution of weights at normal displacement:
 Armament: 720 tons, 3.3 %
 Armour: 4,324 tons, 19.9 %
    - Belts: 936 tons, 4.3 %
    - Torpedo bulkhead: 356 tons, 1.6 %
    - Armament: 895 tons, 4.1 %
    - Armour Deck: 2,137 tons, 9.8 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 5,788 tons, 26.7 %
 Hull, fittings & equipment: 8,337 tons, 38.4 %
 Fuel, ammunition & stores: 2,814 tons, 13.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,688 lbs / 11,198 Kg = 28.6 x 12.0 " / 305 mm shells or 2.9 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 5.0 ft / 1.5 m
 Roll period: 15.1 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.48
 Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.534 / 0.543
 Length to Beam Ratio: 8.75 : 1
 'Natural speed' for length: 26.46 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -4.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  32.00 ft / 9.75 m,  26.00 ft / 7.92 m
    - Forward deck: 36.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 21.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Quarter deck: 15.00 %,  18.00 ft / 5.49 m,  20.00 ft / 6.10 m
    - Average freeboard:  23.94 ft / 7.30 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 136.1 %
  - Above water (accommodation/working, high = better): 189.3 %
 Waterplane Area: 38,501 Square feet or 3,577 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 141 lbs/sq ft or 690 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.29
  - 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