WesWorld

Heavy Cruisers of the Japanese Navy.

Heavy Cruisers iin service.


Yukino Class: Yukino, Tsubaki, Rika, Aya, Maho, Tsubasa.

Myoko Class: Myoko, Maya, Takao, Ashigara, Harugo, Atago, Nachi, Choukai.

Spring Sharp 2.01 Data:
Note that the Yukino's range has been slightly increased in order to get the same light displacement as the original SS sim (since that tonnage is used in the reports).

Edit 8/1/06: Funny that I now notice that the secondaries weren't superfiring...

Yukino, Japan Heavy Cruiser laid down 1924

Displacement:
12,349 t light; 12,929 t standard; 14,743 t normal; 16,195 t full load

Dimensions: Length overall / water x beam x draught
671.45 ft / 660.00 ft x 66.00 ft x 24.00 ft (normal load)
204.66 m / 201.17 m x 20.12 m x 7.32 m

Armament:
12 - 8.00" / 203 mm guns (6x2 guns), 250.00lbs / 113.40kg shells, 1924 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 4.13" / 105 mm guns (4x2 guns), 36.00lbs / 16.33kg shells, 1921 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
12 - 1.57" / 40.0 mm guns (6x2 guns), 2.00lbs / 0.91kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
24 - 0.98" / 25.0 mm guns (8x3 guns), 0.57lbs / 0.26kg shells, 1918 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 3,326 lbs / 1,509 kg
Shells per gun, main battery: 150
12 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 419.00 ft / 127.71 m 9.91 ft / 3.02 m
Ends: Unarmoured
Main Belt covers 98 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 3.00" / 76 mm 3.00" / 76 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: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 102,362 shp / 76,362 Kw = 32.00 kts
Range 10,555nm at 15.00 kts
Bunker at max displacement = 3,265 tons

Complement:
668 - 869

Cost:
£3.895 million / $15.580 million

Distribution of weights at normal displacement:
Armament: 424 tons, 2.9 %
Armour: 2,753 tons, 18.7 %
- Belts: 1,040 tons, 7.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 593 tons, 4.0 %
- Armour Deck: 1,068 tons, 7.2 %
- Conning Tower: 52 tons, 0.4 %
Machinery: 3,372 tons, 22.9 %
Hull, fittings & equipment: 5,701 tons, 38.7 %
Fuel, ammunition & stores: 2,394 tons, 16.2 %
Miscellaneous weights: 100 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,136 lbs / 7,773 Kg = 66.9 x 8.0 " / 203 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 3.2 ft / 1.0 m
Roll period: 15.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.73
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.494
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.69 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 19.97 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.50 ft / 9.60 m
- Forecastle (20 %): 21.40 ft / 6.52 m
- Mid (50 %): 20.80 ft / 6.34 m
- Quarterdeck (15 %): 20.80 ft / 6.34 m
- Stern: 18.30 ft / 5.58 m
- Average freeboard: 21.63 ft / 6.59 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.5 %
- Above water (accommodation/working, high = better): 129.6 %
Waterplane Area: 28,855 Square feet or 2,681 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 121 lbs/sq ft or 589 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.35
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Myoko, Japan Heavy Cruiser laid down 1939
Ships: Myoko, Maya, Takao, Ashigara, Harugo, Atago, Nachi, Choukai

Displacement:
12,300 t light; 12,845 t standard; 14,265 t normal; 15,400 t full load

Dimensions: Length overall / water x beam x draught
699.46 ft / 680.00 ft x 70.00 ft x 20.50 ft (normal load)
213.20 m / 207.26 m x 21.34 m x 6.25 m

Armament:
10 - 8.00" / 203 mm guns (5x2 guns), 250.00lbs / 113.40kg shells, 1939 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 2 raised mounts - superfiring
12 - 4.13" / 105 mm guns (6x2 guns), 34.00lbs / 15.42kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
24 - 0.98" / 25.0 mm guns (8x3 guns), 0.57lbs / 0.26kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
32 - 0.52" / 13.2 mm guns (4x8 guns), 0.09lbs / 0.04kg shells, 1939 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 2,973 lbs / 1,348 kg
Shells per gun, main battery: 150
16 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 431.00 ft / 131.37 m 11.00 ft / 3.35 m
Ends: Unarmoured
Main Belt covers 98% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 3.00" / 76 mm 3.00" / 76 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: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 118,140 shp / 88,133 Kw = 34.50 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 2,555 tons

Complement:
652 - 848

Cost:
£6.968 million / $27.873 million

Distribution of weights at normal displacement:
Armament: 381 tons, 2.7%
Armour: 2,282 tons, 16.0%
- Belts: 795 tons, 5.6%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 524 tons, 3.7%
- Armour Deck: 925 tons, 6.5%
- Conning Tower: 38 tons, 0.3%
Machinery: 3,196 tons, 22.4%
Hull, fittings & equipment: 5,941 tons, 41.6%
Fuel, ammunition & stores: 1,965 tons, 13.8%
Miscellaneous weights: 500 tons, 3.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,580 lbs / 8,428 Kg = 72.6 x 8.0 " / 203 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 3.6 ft / 1.1 m
Roll period: 15.5 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.512
Length to Beam Ratio: 9.71 : 1
'Natural speed' for length: 29.79 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.24 ft / 9.22 m
- Forecastle (20%): 21.24 ft / 6.47 m
- Mid (50%): 21.24 ft / 6.47 m
- Quarterdeck (15%): 21.24 ft / 6.47 m
- Stern: 16.24 ft / 4.95 m
- Average freeboard: 21.59 ft / 6.58 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.5%
- Above water (accommodation/working, high = better): 144.3%
Waterplane Area: 33,343 Square feet or 3,098 Square metres
Displacement factor (Displacement / loading): 117%
Structure weight / hull surface area: 120 lbs/sq ft or 587 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.18
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent