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French Seine class corvette, laid down 1922
Length, 70.0 m x Beam, 8.2 m x Depth, 2.8
m
648 tonnes normal displacement (607 tonnes standard)
Main battery: 3 x 10.0-cm
AA battery: 4 x 4.0-cm
Light
battery: 4 x 1.3-cm
Weight of broadside: 45 kg
4 TT, 53.0 cm in one quad mount
50 tons depth charges
Hull
unarmored
Battery armor:
Main, 2.5 cm shields
AA, 2.5 cm shields
Maximum speed for 11844 shaft kw
= 29.00 knots
Approximate cruising radius, 2500 nm / 12 knots
Typical complement: 64-83
Estimated
cost, $808,000 (£202,000)
Remarks:
Caution: Hull structure is subject to strain in open-sea
conditions.
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.
Distribution of weights:
Percent
normal
displacement:
Armament .........................
12 tonnes = 2 pct
Armor, total ..................... 5 tonnes = 1 pct
Armament 5 tonnes = 1 pct
Machinery
........................ 308 tonnes = 47 pct
Hull and fittings; equipment ..... 210 tonnes = 32 pct
Fuel, ammunition,
stores ......... 63 tonnes = 10 pct
Miscellaneous weights ............ 50 tonnes = 8 pct
-----
648 tonnes = 100
pct
Estimated metacentric height, 0.2 m
Displacement summary:
Light ship: 585 tonnes
Standard
displacement: 607 tonnes
Normal service: 648 tonnes
Full load: 679 tonnes
Loading submergence 313 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin
of stability: 1.08
Shellfire needed to sink: 91 kg = 6.5 x 10.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 0.2
(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, 0.30
Relative quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient: 0.40
Sharpness coefficient:
0.31
Hull speed coefficient 'M' = 8.11
'Natural speed' for length = 15.2 knots
Power going to wave formation
at
top speed: 71 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed
by
magazines and engineering spaces: 176 percent
Relative accommodation and working space: 80 percent
Displacement
factor: 53 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 144 kg)
Relative longitudinal hull strength: 2.71
(for
4.40 m average freeboard;
freeboard adjustment +1.73 m)
Relative composite hull strength: 0.59
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[Machine-readable parameters: Spring Style v. 1.2.1]
229.60 x 26.90 x 9.18; 14.43 -- Dimensions
0.40
-- Block coefficient
1922 -- Year laid down
29.00 / 2500 / 12.00; Oil-fired turbine or equivalent -- Speed / radius
/ cruise
50 tons -- Miscellaneous weights
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3 x 3.94; 0 -- Main battery; turrets
Central positioning
of guns
Gun-shields
:
0 -- No secondary battery
4 x 1.57 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
4 / 0 / 20.87 -- TT / submerged / size
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0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.98 / 0.00 / 0.98 / 0.00 -- Battery armor
(Note: For portability, values are
stored in Anglo-American units)
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