WesWorld

SS31, laid down 1931

Length, 247 ft x Beam, 30.0 ft x Depth, 19.7 ft
2085 tons normal displacement (1558 tons standard)

Main battery: 2 x 4.53-inch / 115mm
AA battery: 2 x 1.38-inch / 35mm
Light battery: 1 x 0.54-inch / 13.7mm

Weight of broadside: 96 lbs

8 TT, 21.0" (6 forwards, 2 aft)

Operational diving depth: 240 feet
Emergency diving depth: 385 feet
Crush depth: 600 feet

Maximum speed for 5000 shp = 18.27 knots
Approximate cruising radius, 9500 nm / 15 kts

Typical complement: 154-201


Estimated cost, $1.462 million (£365,000)

Remarks:

Caution: lacks seaworthiness -- very limited seakeeping ability.

Caution: Very cramped ship with excessively poor habitability;
lacks suitable working space.

Ship has quick, 'lively' roll; not a steady gun platform.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 12 tons = 1 pct
Machinery ........................ 149 tons = 7 pct
Hull and fittings; equipment ..... 897 tons = 43 pct
Fuel, ammunition, stores ......... 577 tons = 28 pct
Miscellaneous weights ............ 450 tons = 22 pct
-----
2085 tons = 100 pct

Estimated metacentric height, 0.8 ft

Displacement summary:

Light ship: 1508 tons
Standard displacement: 1558 tons
Normal service: 2085 tons
Full load: 2499 tons

Loading submergence 133 tons/foot

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.01

Shellfire needed to sink: 1104 lbs = 23.7 x 4.5-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 1 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.00

Relative quality as a seaboat: 0.00

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Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.35
Hull speed coefficient 'M' = 5.91
'Natural speed' for length = 15.7 knots
Power going to wave formation
at top speed: 52 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 96 percent

Relative accommodation and working space: 1 percent


Displacement factor: 247 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 2.77
(Structure weight per square
foot of hull surface: 120 lbs)

Relative longitudinal hull strength: 2.32
(for 0.1 ft average freeboard;
freeboard adjustment -11.0 ft)

Relative composite hull strength: 2.43

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[Machine-readable parameters: Spring Style v. 1.2.1]

247.00 x 30.00 x 19.70; 0.10 -- Dimensions
0.50 -- Block coefficient
1931 -- Year laid down
18.27 / 9500 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
450 tons -- Miscellaneous weights
++++++++++
2 x 4.53; 0 -- Main battery; turrets
:
0 -- No secondary battery
2 x 1.38 -- Tertiary (QF/AA) battery
Gun-shields
:
1 x 0.54 -- Fourth (light) battery
8 / 8 / 21.00 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor


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Big and fast. How many reload torpedoes are carried for the bow and stern torpedo tubes?

I'd say two per tube forwards, one per tube aft.