Predreadnought Estafey, laid down 1903
Length, 117.7 m x Beam, 22.6 m x Depth, 8.2 m
13275 tonnes normal displacement (12207 tonnes standard)
Main battery: 4 x 30.5-cm (2 x 2)
Secondary battery: 4 x 20.3-cm (2 x 2)
QF battery:
12 x 15.2-cm
Light battery: 14 x 7.6-cm
Weight of broadside: 2708 kg
3 TT, 46.0 cm (submerged)
Main belt, 22.9 cm; bow and stern, 18.0 cm
Upper belt, 20.0 cm
Torpedo bulkhead, 2.0 cm
Armor deck, average 10.0 cm
Conning tower, 23.0 cm
Battery armor:
Main, 25.0 cm / secondary,
15.0 cm
QF, 13.0 cm / light guns, 2.5 cm shields
Maximum speed for 6398 shaft kw = 16.00 knots
Approximate cruising radius, 5000 nm / 10 knots
Typical complement: 618-804
Estimated cost, $4.705 million (£1.176 million)
Remarks:
Relative extent of belt armor, 90 percent of 'typical' coverage.
Main belt does not fully protect magazines and
engineering spaces.
Ship has slow, easy roll; a good, steady gun platform.
Excellent seaboat; comfortable and able to fight her guns
in the
heaviest weather.
Main deck QF guns subject to being washed down in a seaway.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 745 tonnes
= 6 pct
Armor, total .....................
4998 tonnes = 38 pct
Belt
1904 tonnes = 14 pct
Torpedo
bulkhead 198 tonnes =
1 pct
Deck
1480 tonnes = 11 pct
C.T.
109 tonnes = 1 pct
Armament
1307 tonnes = 10 pct
Machinery ........................ 1072 tonnes =
8 pct
Hull and fittings; equipment ..... 4630 tonnes
= 35 pct
Fuel, ammunition, stores ......... 1830
tonnes = 14 pct
Miscellaneous weights ............
0 tonnes = 0 pct
-----
13275 tonnes = 100 pct
Estimated metacentric height, 1.2 m
Displacement summary:
Light ship:
11445 tonnes
Standard displacement: 12207 tonnes
Normal service: 13275 tonnes
Full load: 14077 tonnes
Loading submergence 1905 tonnes/metre
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.11
Shellfire needed to sink: 5505 kg = 14.0 x 30.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 2.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.67
Relative quality as a seaboat: 1.70
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Hull form characteristics:
Block coefficient: 0.60
Sharpness coefficient: 0.45
Hull speed coefficient 'M' = 4.99
'Natural speed' for length = 19.6 knots
Power going to wave formation
at top speed: 43 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 99 percent
Relative accommodation and working space: 103 percent
Displacement factor: 101 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.97
(Structure weight per square
metre
of hull surface: 748 kg)
Relative longitudinal hull strength: 2.78
(for 5.00 m average freeboard;
freeboard
adjustment +0.11 m)
Relative composite hull strength: 1.08
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[Machine-readable parameters: Spring Style v. 1.2.1]
386.06 x 74.13 x 27.06; 16.40 -- Dimensions
0.60 -- Block coefficient
1903 -- Year laid down
16.00 / 5000
/ 10.00; Turbine, coal fired -- Speed / radius / cruise
0 tons -- Miscellaneous weights
++++++++++
4 x 12.01;
2; 0 -- Main battery; turrets; superfiring
:
4 x 7.99; 2 -- Secondary battery; turrets
:
12 x 5.98 -- Tertiary (QF/AA) battery
Main deck battery
:
14 x 3.00 -- Fourth (light)
battery
3 / 3 / 18.11 -- TT / submerged / size
++++++++++
9.02 / 7.09 / 7.87 / 0.79; 90 -- Belt armor; relative
extent
3.94 / 9.06 -- Deck / CT
9.84 / 5.91 / 5.12 / 0.98 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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