Gambetta Class Armored Cruiser, laid down 1901
Length, 146.5 m x Beam, 21.4 m x Depth, 8.4 m
13276 tonnes normal displacement (12464 tonnes standard)
Main battery: 4 x 19.0-cm (2 x 2)
Secondary battery: 16 x 16.5-cm
QF battery: 24 x
4.5-cm
Weight of broadside: 1408 kg
3 TT, 46.0 cm
Main belt, 15.0 cm; bow and stern, 12.0 cm
Upper belt, 7.0 cm
Armor deck, average 5.0 cm
Conning tower, 20.0 cm
Battery armor:
Main, 20.0 cm / secondary,
16.0 cm
QF, 6.0 cm
Maximum speed for 19197 indicated kw = 22.00 knots
Approximate cruising radius, 5000 nm / 10 knots
Typical complement: 618-804
Estimated cost, $5.189 million (£1.297 million)
Remarks:
Relative extent of belt armor, 168 percent of 'typical' coverage.
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.
Cramped ship; poor crew accommodation, limited working space.
Main deck secondary guns subject to being washed down
in a seaway.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 387 tonnes
= 3 pct
Armor, total .....................
3901 tonnes = 29 pct
Belt
2326 tonnes = 18 pct
Deck
772 tonnes = 6 pct
C.T.
95 tonnes = 1 pct
Armament
708 tonnes = 5 pct
Machinery ........................ 3958 tonnes =
30 pct
Hull and fittings; equipment ..... 3695 tonnes
= 28 pct
Fuel, ammunition, stores ......... 1335
tonnes = 10 pct
Miscellaneous weights ............
0 tonnes = 0 pct
-----
13276 tonnes = 100 pct
Estimated metacentric height, 1.3 m
Displacement summary:
Light ship:
11941 tonnes
Standard displacement: 12464 tonnes
Normal service: 13276 tonnes
Full load: 13872 tonnes
Loading submergence 1987 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.22
Shellfire needed to sink: 3842 kg = 40.4 x 19.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 1.3
(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, 0.32
Relative quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient: 0.50
Sharpness coefficient: 0.38
Hull speed coefficient 'M' = 6.21
'Natural speed' for length = 21.9 knots
Power going to wave formation
at top speed: 48 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 119 percent
Relative accommodation and working space: 87 percent
Displacement factor: 89 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.96
(Structure weight per square
metre
of hull surface: 548 kg)
Relative longitudinal hull strength: 1.41
(for 4.25 m average freeboard;
freeboard
adjustment -0.64 m)
Relative composite hull strength: 1.00
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[Machine-readable parameters: Spring Style v. 1.2.1]
480.52 x 70.19 x 27.55; 13.94 -- Dimensions
0.50 -- Block coefficient
1901 -- Year laid down
22.00 / 5000
/ 10.00; Reciprocating -- Speed / radius / cruise
0 tons -- Miscellaneous weights
++++++++++
4 x 7.48; 2;
0 -- Main battery; turrets; superfiring
:
16 x 6.50; 0 -- Secondary battery; turrets
Main
deck battery
:
24 x 1.77 -- Tertiary (QF/AA) battery
:
0 -- No fourth (light) battery
3 / 0 / 18.11 -- TT / submerged / size
++++++++++
5.91 / 4.72 / 2.76 / 0.00; 168 -- Belt armor; relative extent
1.97 / 7.87 -- Deck / CT
7.87 / 6.30 / 2.36 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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