The S8 scout cruisers (Ger/CS/1915)

The next sketch design in "The Red Book" is a German scout cruiser (ships S-8 to S-19). The short specification is for a 2,400 ton ship with a speed of 35 knots. The armament is 4-6in/45 QF guns and 4-24in TT. The only dimensions specified are the length and beam: 355ft x 37ft. There is superfiring gun aft. This is the Springsharp design:

Ger/CS/1915 "S8" class, Germany Scout Cruiser laid down 1915 (Engine 1950)

Displacement:
 1,926 t light; 2,010 t standard; 2,162 t normal; 2,283 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (358.65 ft / 355.00 ft) x 37.00 ft x (12.00 / 12.49 ft)
 (109.32 m / 108.20 m) x 11.28 m  x (3.66 / 3.81 m)

Armament:
      4 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   3 x Single mounts on centreline ends, majority aft
  1 raised mount aft - superfiring
   1 x Single mount on centreline, aft deck forward
      Weight of broadside 400 lbs / 181 kg
      4 - 24.0" / 610 mm, 23.00 ft / 7.01 m torpedoes - 1.877 t each, 7.507 t total
 In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 1.00" / 25 mm  3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 61,370 shp / 45,782 Kw = 35.00 kts
 Range 4,000nm at 14.00 kts
 Bunker at max displacement = 273 tons

Complement:
 158 - 206

Cost:
 £0.390 million / $1.561 million

Distribution of weights at normal displacement:
 Armament: 123 tons, 5.7 %
    - Guns: 116 tons, 5.4 %
    - Torpedoes: 8 tons, 0.3 %
 Armour: 41 tons, 1.9 %
    - Armament: 41 tons, 1.9 %
 Machinery: 1,141 tons, 52.8 %
 Hull, fittings & equipment: 620 tons, 28.7 %
 Fuel, ammunition & stores: 236 tons, 10.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   524 lbs / 238 Kg = 4.9 x 6.0 " / 152 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 12.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.66
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.480 / 0.487
 Length to Beam Ratio: 9.59 : 1
 'Natural speed' for length: 18.84 kts
 Power going to wave formation at top speed: 72 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 15.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Forward deck: 13.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Aft deck: 57.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Quarter deck: 15.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  19.30 ft / 5.88 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 187.7 %
  - Above water (accommodation/working, high = better): 152.9 %
 Waterplane Area: 8,596 Square feet or 799 Square metres
 Displacement factor (Displacement / loading): 64 %
 Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.41
  - Longitudinal: 3.21
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent