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Public Data:

Dairen Class
RCN Dairen
Dimensions: 800.00 ft x 91.00 ft x 29.00 ft
Standard Displacement: 28,542 tons
Armament: 3x3 - 305 mm guns
8x2 - 105mm guns
4x4 - 40mm AA guns
10x3 - 25mm guns
4x2 - 24" submerged torpedo tubes
Armour: Belt 10.00"
Main turrets 11.00", 2nd turret 2.00",
AA shield 1.00", Light AA gun shields 1.00",
Armour deck 4.00", Conning tower 12.00"
Machinery: 12 oil fired boilers, 4 sets of steam turbines,
Geared drive, 4 shafts, 190,000 shp = 32.00 kts
Range: 8,000nm at 15.00 kts
Complement: 65 Officers, 1500 other rank

Dairen II Class
Not to be constructed.
Dimensions: 800.00 ft x 95.00 ft x 30.00 ft
Standard Displacement: 31,457 tons
Armament: 3x2 - 360mm guns
8x2 - 130mm guns
2x8 - 40mm AA guns
10x3 - 25mm guns
6x4 - 13.2mm MG
Armour: Belt 10.00"
Main turrets 12.00", 2nd turret 3.00",
AA shield 1.00", Light AA gun shields 1.00",
Armour deck 4.00", Conning tower 2.50"
Machinery: 12 oil fired boilers, 4 sets of steam turbines,
Geared drive, 4 shafts, 180,000 shp = 32.00 kts
Range: 8,000nm at 15.00 kts
Complement: 70 Officers, 1580 other rank



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RCN Dairen, Chosen Battle Cruiser laid down 1925 in Japan

Displacement:
28,784 t light; 30,044 t standard; 32,573 t normal; 34,596 t full load

Dimensions: Length overall / water x beam x draught
817.01 ft / 800.00 ft x 80.00 ft (Bulges 91.00 ft) x 29.00 ft (normal load)
249.03 m / 243.84 m x 24.38 m (Bulges 27.74 m) x 8.84 m

Armament:
9 - 12.00" / 305 mm guns (3x3 guns), 925.00lbs / 419.57kg shells, 1925 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
16 - 4.13" / 105 mm guns (8x2 guns), 36.00lbs / 16.33kg shells, 1921 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 4 raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (4x4 guns), 2.00lbs / 0.91kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
30 - 0.98" / 25.0 mm guns (10x3 guns), 0.57lbs / 0.26kg shells, 1918 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 8,950 lbs / 4,060 kg
Shells per gun, main battery: 120
8 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 635.50 ft / 193.70 m 10.90 ft / 3.32 m
Ends: Unarmoured
Main Belt covers 122 % of normal length

- Torpedo Bulkhead and Bulges:
1.00" / 25 mm 635.50 ft / 193.70 m 26.44 ft / 8.06 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 7.00" / 178 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -

- Armour deck: 4.00" / 102 mm, Conning tower: 12.00" / 305 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 205,167 shp / 153,054 Kw = 34.00 kts
Range 9,015nm at 15.00 kts
Bunker at max displacement = 4,551 tons

Complement:
1,211 - 1,575

Cost:
£9.231 million / $36.925 million

Distribution of weights at normal displacement:
Armament: 1,048 tons, 3.2 %
Armour: 8,735 tons, 26.8 %
- Belts: 2,804 tons, 8.6 %
- Torpedo bulkhead: 622 tons, 1.9 %
- Armament: 1,771 tons, 5.4 %
- Armour Deck: 3,274 tons, 10.1 %
- Conning Tower: 264 tons, 0.8 %
Machinery: 6,661 tons, 20.5 %
Hull, fittings & equipment: 12,240 tons, 37.6 %
Fuel, ammunition & stores: 3,788 tons, 11.6 %
Miscellaneous weights: 100 tons, 0.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
34,619 lbs / 15,703 Kg = 40.1 x 12.0 " / 305 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 3.9 ft / 1.2 m
Roll period: 19.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.540
Length to Beam Ratio: 8.79 : 1
'Natural speed' for length: 28.28 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 67
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 33.00 ft / 10.06 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 23.00 ft / 7.01 m
- Quarterdeck (15 %): 23.00 ft / 7.01 m
- Stern: 23.00 ft / 7.01 m
- Average freeboard: 24.07 ft / 7.34 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 122.2 %
- Above water (accommodation/working, high = better): 143.5 %
Waterplane Area: 44,249 Square feet or 4,111 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 170 lbs/sq ft or 829 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.12
- 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

Main Belt inclined at 10 degrees.