Dowager Eisho class, Japan Ocean Liner laid down 1921
- Empress Yoshiko
- Empress Yasuko
- Empress Asako
Displacement:
38,997 t light; 40,028 t standard; 51,576 t normal; 60,607 t full load
Loading submergence 1,641 tons/feet
61,088 GRT
Dimensions:
860.00 ft x 93.00 ft x 37.00 ft (normal load)
262.13 m x 28.35 m x 11.28 m
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 126,167 shp / 94,121 Kw = 28.00 kts
Range 7,250nm at 27.00 kts
Complement:
856 – 1,112
Cost:
£5.022 million / $20.090 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 4,345 tons, 8.4 %
Hull, fittings & equipment: 14,652 tons, 28.4 %
Fuel, ammunition & stores: 12,579 tons, 24.4 %
Miscellaneous weights: 20,000 tons, 38.8 %
Metacentric height 5.0
Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Good seaboat, rides out heavy weather easily
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.06
Shellfire needed to sink: 9,327 lbs / 4,231 Kg = 86.4 x 6 " / 152 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 30 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 1.20
Hull form characteristics:
Block coefficient: 0.610
Sharpness coefficient: 0.38
Hull speed coefficient 'M': 7.07
'Natural speed' for length: 29.33 kts
Power going to wave formation at top speed: 45 %
Trim: 15
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 70.3 %
Relative accommodation and working space: 297.3 %
(Average = 100%)
Displacement factor: 180 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.91
(Structure weight / hull surface area: 137 lbs / square foot or 667 Kg / square metre)
Relative longitudinal hull strength: 2.28
(for 46.50 ft / 14.17 m average freeboard, freeboard adjustment 25.48 ft)
Relative composite hull strength: 1.00
ACCOMMODATION
First Class Accommodation:
One-berth: 83 cabins (83 passengers)
Two-berth: 80 cabins (160 passengers)
Three-berth: 99 cabins (297 passengers)
Total: 540 passengers
Second Class Accommodation:
Two-berth: 65 cabins (130 passengers)
Three-berth: 10 cabins (30 passengers)
Four-berth: 110 cabins (440 passengers)
Total: 600 passengers
Third Class Accommodation:
Two-berth: 90 cabins (180 passengers)
Four-berth: 185 cabins (740 passengers)
Six-berth: 80 cabins (480 passengers)
Eight-berth: 15 cabins (120 passengers)
Ten-berth: 8 cabins (80 passengers)
Total: 1,600 passengers
First Class: 8,100 tons
Second Class: 4,500 tons
Third Class: 4,480 tons
Cargo: 2000 tons
Extras: 920 tons
Total miscellaneous load: 20,000 tons
Total number of passengers: 2740
Standard Crew: 1,000
Maximum number of people on board: 3940 (with 1,200 crew)
Lifeboats:
100 passengers => 20 = 2000
60 passengers => 20 = 1200
40 passengers => 20 = 800
Total Capacity: 4000
Notes:
The class name: Empress Asako was posthumously known as Empress Dowager Eisho (source:
http://www.polbox.com/f/felixpp/japan2.htm)
Info on
http://www.titanic.com/story/35/Deck_composition
was used as base to determine the ammount of cabins per type per class.
Crew and torpedo survivability were divided by 2, shellfire survivability was divided by 10.
Walter