The original concept for the Ger/CB/1906 battlecruisers

Springsharp 3.0b2 works well for recreating the original concept for our early 1970's designs. The Ger/CB/1906 ships were intended to have inclined armour, so this is a natural for the new Springsharp. This is the original specification:

Scharnhorst class
800ft x 85ft x 25.6ft
Cp = 0.53
Cm = 0.95
120,000 SHP = 33 knots (Max. 36 knots on overload)
8-12in/45 BLR
12-4in QF guns
4in belt
3in deck
6in turrets and barbettes
Displacement=25,000 tons (Standard)
Hull=11,250 tons
Mach= 8,580 tons
Arm=    955 tons
Misc= 2,000 tons
Prot= 2,215 tons

This is a photograph of one of the two ships:

The 120,000 SHP for 33 knots was over-optimistic. 120,000 SHP is only good for 30 knots, which was fast for the time. This is the Springsharp report:

Ger/CB/1906 Original Concept, Germany Battlecruiser laid down 1906

Displacement:
 24,778 t light; 25,733 t standard; 28,599 t normal; 30,892 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (803.00 ft / 800.00 ft) x 85.00 ft x (25.60 / 27.25 ft)
 (244.75 m / 243.84 m) x 25.91 m  x (7.80 / 8.31 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   4 x Single mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      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, 1906 Model
   12 x Single mounts on sides, evenly spread
      Weight of broadside 7,377 lbs / 3,346 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 82 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 425.00 ft / 129.54 m 25.60 ft / 7.80 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks

   - Conning towers: Forward 6.00" / 152 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 119,660 shp / 89,266 Kw = 30.20 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 5,159 tons

Complement:
 1,099 - 1,429

Cost:
 £2.649 million / $10.598 million

Distribution of weights at normal displacement:
 Armament: 1,648 tons, 5.8 %
 Armour: 5,190 tons, 18.1 %
    - Belts: 1,169 tons, 4.1 %
    - Torpedo bulkhead: 604 tons, 2.1 %
    - Armament: 1,401 tons, 4.9 %
    - Armour Deck: 1,895 tons, 6.6 %
    - Conning Tower: 121 tons, 0.4 %
 Machinery: 7,770 tons, 27.2 %
 Hull, fittings & equipment: 10,171 tons, 35.6 %
 Fuel, ammunition & stores: 3,820 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   28,273 lbs / 12,825 Kg = 32.7 x 12.0 " / 305 mm shells or 3.2 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 5.5 ft / 1.7 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 72 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.45

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.575 / 0.583
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 48 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 35.00 %,  34.00 ft / 10.36 m,  27.00 ft / 8.23 m
    - Forward deck: 37.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Aft deck: 13.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Quarter deck: 15.00 %,  18.00 ft / 5.49 m,  19.00 ft / 5.79 m
    - Average freeboard:  25.35 ft / 7.73 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 143.8 %
  - Above water (accommodation/working, high = better): 204.5 %
 Waterplane Area: 48,583 Square feet or 4,514 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 151 lbs/sq ft or 737 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.05
  - 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