The GB/CL/1921b design

This design dates from late October 2004. The ship was intended to be a modern-looking E-class style light cruiser. The hull is flush-decked with a flared bow and transom stern. The armament is 9-6in QF guns in triple turrets and 6-4.7in QF guns in single mounts with shields. The armour basis is just 3in with a 2in deck. The speed is 33 knots and the range is 7,500nm at 15 knots, suitable for ocean cruising. This is the Springsharp report:

GB/CL/1921b, Enter country Enter ship type laid down 1921 (Engine 1937)

Displacement:
 7,566 t light; 7,852 t standard; 8,650 t normal; 9,289 t full load

Dimensions: Length overall / water x beam x draught
 573.54 ft / 570.00 ft x 54.00 ft x 20.00 ft (normal load)
 174.81 m / 173.74 m x 16.46 m  x 6.10 m

Armament:
      9 - 6.00" / 152 mm guns (3x3 guns), 108.00lbs / 48.99kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, majority aft, 1 raised mount aft - superfiring
      2 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, all raised mounts
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Breech loading guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 1,283 lbs / 582 kg
 Shells per gun, main battery: 150

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 365.00 ft / 111.25 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.50" / 13 mm 365.00 ft / 111.25 m 19.00 ft / 5.79 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 76,293 shp / 56,914 Kw = 33.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 1,437 tons

Complement:
 448 - 583

Cost:
 £1.771 million / $7.083 million

Distribution of weights at normal displacement:
 Armament: 160 tons, 1.9 %
 Armour: 1,793 tons, 20.7 %
    - Belts: 545 tons, 6.3 %
    - Torpedo bulkhead: 128 tons, 1.5 %
    - Armament: 300 tons, 3.5 %
    - Armour Deck: 783 tons, 9.1 %
    - Conning Tower: 36 tons, 0.4 %
 Machinery: 2,115 tons, 24.4 %
 Hull, fittings & equipment: 3,499 tons, 40.4 %
 Fuel, ammunition & stores: 1,084 tons, 12.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   11,365 lbs / 5,155 Kg = 105.2 x 6.0 " / 152 mm shells or 1.7 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 2.5 ft / 0.8 m
 Roll period: 14.3 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.492
 Length to Beam Ratio: 10.56 : 1
 'Natural speed' for length: 27.16 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 19.00 ft / 5.79 m
    - Mid (50 %):  19.00 ft / 5.79 m
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 19.80 ft / 6.04 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 149.5 %
  - Above water (accommodation/working, high = better): 171.0 %
 Waterplane Area: 21,165 Square feet or 1,966 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 97 lbs/sq ft or 475 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.54
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent