A Super Blonde design

This is my first attempt at a Super Blonde design. The original concept was to have 10-4in QF guns and a speed of 30 knots. The side armor would be 3in with a 1in deck. I decided that a cruising speed of 15 knots and a range of 6500 nm would be reasonable. This is the resulting Springsharp report:

Super Blonde, Great Britain Light Cruiser laid down 1912 (Engine 1937)

Displacement:
 3,922 t light; 4,058 t standard; 4,550 t normal; 4,945 t full load

Dimensions: Length overall / water x beam x draught
 435.84 ft / 435.00 ft x 41.00 ft x 19.00 ft (normal load)
 132.84 m / 132.59 m x 12.50 m  x 5.79 m

Armament:
      10 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, evenly spread, all raised mounts - superfiring
 Weight of broadside 320 lbs / 145 kg
 Shells per gun, main battery: 250
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 285.00 ft / 86.87 m 16.00 ft / 4.88 m
 Ends: 2.00" / 51 mm 150.00 ft / 45.72 m 16.00 ft / 4.88 m
   Main Belt covers 101 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 2.00" / 51 mm       -         -

   - Armour deck: 1.00" / 25 mm, Conning tower: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 44,641 shp / 33,302 Kw = 30.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 887 tons

Complement:
 276 - 360

Cost:
 £0.344 million / $1.376 million

Distribution of weights at normal displacement:
 Armament: 40 tons, 0.9 %
 Armour: 1,017 tons, 22.4 %
    - Belts: 743 tons, 16.3 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 43 tons, 0.9 %
    - Armour Deck: 214 tons, 4.7 %
    - Conning Tower: 18 tons, 0.4 %
 Machinery: 1,237 tons, 27.2 %
 Hull, fittings & equipment: 1,627 tons, 35.8 %
 Fuel, ammunition & stores: 628 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   5,493 lbs / 2,492 Kg = 171.7 x 4.0 " / 102 mm shells or 1.1 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 1.7 ft / 0.5 m
 Roll period: 13.3 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.35
 Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.470
 Length to Beam Ratio: 10.61 : 1
 'Natural speed' for length: 20.86 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (37 %):  22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 17.12 ft / 5.22 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 95.9 %
  - Above water (accommodation/working, high = better): 108.6 %
 Waterplane Area: 11,570 Square feet or 1,075 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 69 lbs/sq ft or 338 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.24
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is adequate
 Good seaboat, rides out heavy weather easily