SS Data
Asama, Japan Armored Cruiser laid down 1912
All scrapped in 1942
Displacement:
8,568 t light; 9,155 t standard; 12,071 t normal; 14,357 t full load
Loading submergence 584 tons/feet
Dimensions:
500.00 ft x 65.00 ft x 26.00 ft (normal load)
152.40 m x 19.81 m x 7.92 m
Armament:
14 - 7.87" / 200 mm guns (8 Main turrets)
10 - 5.12" / 130 mm guns
Secondary guns mounted low & subject to being washed down in a seaway
12 - 1.97" / 50 mm QF guns
24 - 0.98" / 25 mm guns
Weight of broadside 4,145 lbs / 1,880 kg
4 - 21.0" / 533.4 mm above water torpedoes
Armour:
Belt 6.00" / 152 mm, upper belt 2.00" / 51 mm, end belts 2.00" / 51 mm
Belts cover 70 % of normal area
Main turrets 6.00" / 152 mm, 2nd casemates 2.00" / 51 mm
QF gun shields 1.00" / 25 mm, Light gun shields 1.00" / 25 mm
Armour deck 2.00" / 51 mm, Conning tower 13.00" / 330 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 28,163 shp / 21,010 Kw = 23.00 kts
Range 15,500nm at 14.00 kts
Complement:
575 - 748
Cost:
£0.892 million / $3.569 million
Distribution of weights at normal displacement:
Armament: 518 tons, 4.3 %
Armour: 2,920 tons, 24.2 %
Belts: 798 tons, 6.6 %, Armament: 1,218 tons, 10.1 %, Armour Deck: 756 tons, 6.3 %
Conning Tower: 147 tons, 1.2 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 1,123 tons, 9.3 %
Hull, fittings & equipment: 4,007 tons, 33.2 %
Fuel, ammunition & stores: 3,504 tons, 29.0 %
Miscellaneous weights: 0 tons, 0.0 %
Metacentric height 3.0
Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.06
Shellfire needed to sink: 16,993 lbs / 7,708 Kg = 69.6 x 7.9 " / 200 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.7
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.70
Relative quality as seaboat: 1.33
Hull form characteristics:
Block coefficient: 0.500
Sharpness coefficient: 0.36
Hull speed coefficient 'M': 6.67
'Natural speed' for length: 22.36 kts
Power going to wave formation at top speed: 47 %
Trim: 53
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 64.1 %
Relative accommodation and working space: 96.0 %
(Average = 100%)
Displacement factor: 130 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.97
(Structure weight / hull surface area: 121 lbs / square foot or 590 Kg / square metre)
Relative longitudinal hull strength: 1.62
(for 15.50 ft / 4.72 m average freeboard, freeboard adjustment -0.22 ft)
Relative composite hull strength: 1.02
Main guns in two twin turrets, six in single turrets and 4 in casemate mouts (Edgar Quinet layout)
Twin turret main gun armor is 9 inch, single gun main gun armor and main gun casemate is 6 inch (tested with splitting up the main armament)
SS 2.01 Data
Asama, Japan Koujun laid down 1912
Displacement:
8,602 t light; 9,155 t standard; 12,071 t normal; 14,356 t full load
Dimensions: Length overall / water x beam x draught
506.88 ft / 500.00 ft x 65.00 ft x 26.00 ft (normal load)
154.50 m / 152.40 m x 19.81 m x 7.92 m
Armament:
4 - 7.87" / 200 mm guns (2x2 guns), 250.00lbs / 113.40kg shells, 1910 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
6 - 7.87" / 200 mm guns in single mounts, 250.00lbs / 113.40kg shells, 1910 Model
Breech loading guns in turrets (on barbettes)
on side, all amidships
4 - 7.87" / 200 mm guns in single mounts, 250.00lbs / 113.40kg shells, 1910 Model
Breech loading guns in casemate mounts
on side ends, evenly spread
4 guns in hull casemates - Limited use in all but light seas
10 - 5.12" / 130 mm guns in single mounts, 55.00lbs / 24.95kg shells, 1910 Model
Breech loading guns in casemate mounts
on side, all amidships
10 guns in hull casemates - Limited use in all but light seas
36 - 1.97" / 50.0 mm guns (14 mounts), 3.81lbs / 1.73kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 6 raised mounts
Note that I am currently too lazy to edit the AA bit to separate it into the 50mm and 25mm guns.
Weight of broadside 4,187 lbs / 1,899 kg
Shells per gun, main battery: 120
4 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 228.00 ft / 69.49 m 9.67 ft / 2.95 m
Ends: 2.00" / 51 mm 174.98 ft / 53.33 m 9.67 ft / 2.95 m
97.02 ft / 29.57 m Unarmoured ends
Upper: 2.00" / 51 mm 228.00 ft / 69.49 m 8.00 ft / 2.44 m
Main Belt covers 70 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.00" / 229 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 6.00" / 152 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 6.00" / 152 mm - 2.00" / 51 mm
4th: 2.00" / 51 mm - 2.00" / 51 mm
5th: 1.00" / 25 mm - -
- Armour deck: 2.00" / 51 mm, Conning tower: 13.00" / 330 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 28,163 shp / 21,010 Kw = 23.00 kts
Range 16,300nm at 14.00 kts (Bunkerage = 5,249 tons)
Complement:
575 - 748
Cost:
£0.902 million / $3.608 million
Distribution of weights at normal displacement:
Armament: 528 tons, 4.4 %
Armour: 2,791 tons, 23.1 %
- Belts: 902 tons, 7.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 972 tons, 8.1 %
- Armour Deck: 770 tons, 6.4 %
- Conning Tower: 147 tons, 1.2 %
Machinery: 1,123 tons, 9.3 %
Hull, fittings & equipment: 4,160 tons, 34.5 %
Fuel, ammunition & stores: 3,470 tons, 28.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,159 lbs / 8,237 Kg = 74.4 x 7.9 " / 200 mm shells or 2.7 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 3.5 ft / 1.1 m
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.37
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 7.69 : 1
'Natural speed' for length: 22.36 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: -3.00 ft / -0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.90 ft / 5.76 m
- Forecastle (20 %): 15.80 ft / 4.82 m
- Mid (50 %): 15.80 ft / 4.82 m
- Quarterdeck (15 %): 15.80 ft / 4.82 m
- Stern: 8.50 ft / 2.59 m
- Average freeboard: 15.50 ft / 4.72 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.1 %
- Above water (accommodation/working, high = better): 99.7 %
Waterplane Area: 20,815 Square feet or 1,934 Square metres
Displacement factor (Displacement / loading): 130 %
Structure weight / hull surface area: 125 lbs/sq ft or 609 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.75
- Overall: 1.06
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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