French Spahi class destroyers, laid down 1909
Length, 70.0 m x Beam, 6.7 m x Depth, 3.3 m
624 tonnes normal displacement (566 tonnes standard)
Main battery: 6 x 6.5-cm
Secondary battery: 2 x 4.5-cm
QF battery:
6 x 1.3-cm
Weight of broadside: 26 kg
3 TT, 45.0 cm
Hull unarmored
45 tons depth charges/mines
Maximum speed for 9634 indicated kw = 28.00 knots
Approximate cruising radius, 2500 nm / 10 knots
Typical complement: 62-81
Estimated cost, $294,000 (£73,000)
Remarks:
Caution: Hull structure is subject to strain in open-sea
conditions.
Caution: Delicate, lightwight machinery.
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 .........................
7 tonnes = 1 pct
Machinery ........................
345 tonnes = 55 pct
Hull and fittings; equipment .....
151 tonnes = 24 pct
Fuel, ammunition, stores .........
76 tonnes = 12 pct
Miscellaneous weights ............
45 tonnes = 7 pct
-----
624 tonnes = 100 pct
Estimated metacentric height, 0.2 m
Displacement summary:
Light ship:
548 tonnes
Standard displacement: 566 tonnes
Normal service:
624 tonnes
Full load:
668 tonnes
Loading submergence 256 tonnes/metre
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.14
Shellfire needed to sink: 55 kg = 14.5 x 6.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 0.1
(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, 0.23
Relative quality as a seaboat: 1.22
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.40
Sharpness coefficient: 0.29
Hull speed coefficient 'M' = 8.21
'Natural speed' for length = 15.2 knots
Power going to wave formation
at top speed: 67 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 195 percent
Relative accommodation and working space: 67 percent
Displacement factor: 30 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre
of hull surface: 117 kg)
Relative longitudinal hull strength: 1.85
(for 3.45 m average freeboard;
freeboard
adjustment +0.80 m)
Relative composite hull strength: 0.57
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
229.60 x 21.98 x 10.82; 11.32 -- Dimensions
0.40 -- Block coefficient
1909 -- Year laid down
28.00 / 2500
/ 10.00; Reciprocating -- Speed / radius / cruise
45 tons -- Miscellaneous weights
++++++++++
6 x 2.56; 0 -- Main
battery; turrets
Central positioning of guns
:
2 x 1.77; 0 -- Secondary battery; turrets
:
6 x 0.51 -- Tertiary (QF/AA) battery
:
0 -- No fourth (light) battery
3 / 0 / 17.72 -- TT /
submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor
(Note: For portability, values are stored in Anglo-American units)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++