Another pass at the concept; essentially a .5 knot loss in speed, a bit more range, and swapping two of the octuple 40mm for another 5.5" turret midships. This seems less 'doable' from an objective standpoint, but would result in a better cruiser-weight ship.
HMCS Diana, Canadian (Ex-British) Light Cruiser laid down 1925 (Engine 1937)
Displacement:
4,327 t light; 4,528 t standard; 5,240 t normal; 5,809 t full load
Dimensions: Length overall / water x beam x draught
445.89 ft / 440.00 ft x 44.00 ft x 18.00 ft (normal load)
135.91 m / 134.11 m x 13.41 m x 5.49 m
Armament:
8 - 5.50" / 140 mm guns (4x2 guns), 83.19lbs / 37.73kg shells, 1940 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
32 - 1.57" / 40.0 mm guns (6 mounts), 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised guns - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1925 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 731 lbs / 331 kg
Shells per gun, main battery: 225
8 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.50" / 38 mm 416.00 ft / 126.80 m 8.00 ft / 2.44 m
Ends: Unarmoured
Main Belt covers 145 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 0.50" / 13 mm 0.50" / 13 mm
2nd: 0.50" / 13 mm - -
- Armour deck: 0.80" / 20 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 65,743 shp / 49,044 Kw = 32.00 kts
Range 8,750nm at 15.00 kts
Bunker at max displacement = 1,280 tons
Complement:
307 - 400
Cost:
£1.627 million / $6.510 million
Distribution of weights at normal displacement:
Armament: 108 tons, 2.1 %
Armour: 446 tons, 8.5 %
- Belts: 196 tons, 3.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 55 tons, 1.0 %
- Armour Deck: 196 tons, 3.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,822 tons, 34.8 %
Hull, fittings & equipment: 1,855 tons, 35.4 %
Fuel, ammunition & stores: 913 tons, 17.4 %
Miscellaneous weights: 95 tons, 1.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,817 lbs / 1,731 Kg = 45.9 x 5.5 " / 140 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 2.1 ft / 0.7 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.526
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 20.98 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (35 %): 13.00 ft / 3.96 m (21.00 ft / 6.40 m before break)
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 18.28 ft / 5.57 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 131.0 %
- Above water (accommodation/working, high = better): 123.2 %
Waterplane Area: 13,215 Square feet or 1,228 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 73 lbs/sq ft or 356 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 2.35
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
40 tons - additional weight of DP mounts
30 tons - ASW and Radar
20 tons - Flagship Facilities