DeGrasse Class Light Cruisers, laid down 1919
Length, 168.0 m x Beam, 17.0 m x Depth, 7.0 m
8869 tonnes normal displacement (8040 tonnes standard)
Main battery: 8 x 15.2-cm (4 x 2; 1 superfiring)
Secondary battery: 12 x 10.0-cm
AA battery: 8
x 4.0-cm
Light battery: 4 x 1.3-cm
Weight of broadside: 561 kg
4 TT, 53.0 cm
Main belt, 5.0 cm; bow and stern, 2.0 cm
Armor deck, average 2.0
cm
Conning tower, 8.0 cm
Battery armor:
Main, 7.0 cm / secondary,
2.0 cm
Maximum speed for 66644 shaft kw = 33.00 knots
Approximate cruising radius, 6000 nm / 15 knots
Typical complement: 457-594
Estimated cost, $7.377 million (£1.844 million)
Remarks:
Oil firing.
Relative extent of belt armor, 127 percent of 'typical' coverage.
Main belt does not fully protect magazines and
engineering spaces.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
Magazines and engineering spaces are cramped, with poor
watertight
subdivision.
Roomy upper decks; superior accommodation and working space.
Main deck secondary guns subject to being washed down
in a seaway.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 154 tonnes
= 2 pct
Armor, total .....................
931 tonnes = 10 pct
Belt
393 tonnes = 4 pct
Deck
258 tonnes = 3 pct
C.T.
29 tonnes = 0 pct
Armament
250 tonnes = 3 pct
Machinery ........................ 3171 tonnes =
36 pct
Hull and fittings; equipment ..... 3404 tonnes
= 38 pct
Fuel, ammunition, stores ......... 1109
tonnes = 13 pct
Miscellaneous weights ............
100 tonnes = 1 pct
-----
8869 tonnes = 100 pct
Estimated metacentric height, 0.8 m
Displacement summary:
Light ship:
7760 tonnes
Standard displacement: 8040 tonnes
Normal service: 8869 tonnes
Full load: 9496 tonnes
Loading submergence 1661 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.14
Shellfire needed to sink: 2751 kg = 56.6 x 15.2-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 1.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 70 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.46
Relative quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient: 0.44
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.14
'Natural speed' for length = 23.5 knots
Power going to wave formation
at top speed: 58 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 131 percent
Relative accommodation and working space: 144 percent
Displacement factor: 103 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.95
(Structure weight per square
metre
of hull surface: 495 kg)
Relative longitudinal hull strength: 1.78
(for 6.30 m average freeboard;
freeboard
adjustment +1.79 m)
Relative composite hull strength: 1.01
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[Machine-readable parameters: Spring Style v. 1.2.1]
551.04 x 55.76 x 22.96; 20.66 -- Dimensions
0.44 -- Block coefficient
1919 -- Year laid down
33.00 / 6000
/ 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
100 tons -- Miscellaneous weights
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8
x 5.98; 4; 1 -- Main battery; turrets; superfiring
:
12 x 3.94; 0 -- Secondary battery; turrets
Main deck battery
:
8 x 1.57 -- Tertiary (QF/AA) battery
:
4 x 0.51 -- Fourth (light)
battery
4 / 0 / 20.87 -- TT / submerged / size
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1.97 / 0.79 / 0.00 / 0.00; 127 -- Belt armor; relative
extent
0.79 / 3.15 -- Deck / CT
2.76 / 0.79 / 0.00 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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