WesWorld

French Audaciaux class destroyer, laid down 1921

Length, 100.0 m x Beam, 8.8 m x Depth, 3.6 m
1366 tonnes normal displacement (1231 tonnes standard)

Main battery: 3 x 12.0-cm (3 x 1; 1 superfiring)
AA battery: 4 x 3.7-cm
Light battery: 4 x 1.3-cm

Weight of broadside: 75 kg

8 TT, 53.0 cm in two quadruple mounts

50 tons depth charges

Hull unarmored

Maximum speed for 26049 shaft kw = 33.00 knots
Approximate cruising radius, 5100 nm / 12 knots

Typical complement: 112-146


Estimated cost, $1.667 million (£417,000)

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 ......................... 21 tonnes = 2 pct
Machinery ........................ 749 tonnes = 55 pct
Hull and fittings; equipment ..... 370 tonnes = 27 pct
Fuel, ammunition, stores ......... 176 tonnes = 13 pct
Miscellaneous weights ............ 50 tonnes = 4 pct
-----
1366 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 1190 tonnes
Standard displacement: 1231 tonnes
Normal service: 1366 tonnes
Full load: 1468 tonnes

Loading submergence 501 tonnes/metre

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.17

Shellfire needed to sink: 132 kg = 5.5 x 12.0-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, 0.59

Relative quality as a seaboat: 1.20

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Hull form characteristics:

Block coefficient: 0.43
Sharpness coefficient: 0.29
Hull speed coefficient 'M' = 9.04
'Natural speed' for length = 18.1 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: 192 percent

Relative accommodation and working space: 57 percent


Displacement factor: 52 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 158 kg)

Relative longitudinal hull strength: 1.42
(for 4.51 m average freeboard;
freeboard adjustment +1.41 m)

Relative composite hull strength: 0.55

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[Machine-readable parameters: Spring Style v. 1.2.1]

328.00 x 28.70 x 11.81; 14.81 -- Dimensions
0.43 -- Block coefficient
1921 -- Year laid down
33.00 / 5100 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
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3 x 4.72; 3; 1 -- Main battery; turrets; superfiring
:
0 -- No secondary battery
4 x 1.46 -- Tertiary (QF/AA) battery
:
4 x 0.51 -- Fourth (light) battery
8 / 0 / 20.87 -- TT / submerged / size
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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)


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This is the main gun of the French Audaciaux class destroyer:



French 120mm/50


Caliber = 12.0 cm (4.7 inch)
Shell weight = 28 kg (62 lbs)
Muzzle velocity = 809 m/s (2653 fps)

Relative ballistic performance: 1.00

Muzzle energy = 9.162 megajoules = 3376.0 foot-tons

Relative muzzle energy: 1.00

Barrel length: 50 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 4500 meters 6.8 sec 562 m/s 3.2 deg
5.0 deg 7500 meters 12.8 sec 447 m/s 7.5 deg
7.5 deg 9700 meters 18.2 sec 382 m/s 12.3 deg
10.0 deg 11500 meters 23.3 sec 341 m/s 17.5 deg
12.5 deg 12900 meters 28.0 sec 316 m/s 22.7 deg
15.0 deg 14100 meters 32.6 sec 300 m/s 28.0 deg
20.0 deg 16100 meters 41.0 sec 286 m/s 37.5 deg
25.0 deg 17700 meters 49.0 sec 285 m/s 45.6 deg
30.0 deg 18900 meters 56.5 sec 291 m/s 52.2 deg
35.0 deg 19700 meters 63.6 sec 299 m/s 57.5 deg
40.0 deg 20100 meters 70.3 sec 309 m/s 61.9 deg
45.0 deg 20200 meters 76.7 sec 319 m/s 65.5 deg
50.0 deg 19900 meters 82.7 sec 329 m/s 68.7 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 24.47 cm


Elevation Range Belt Deck

2.5 deg 4600 meters 15 cm
5.9 deg 8400 meters 10 cm
12.1 deg 12700 meters ... 2 cm
17.3 deg 15100 meters 5 cm
25.9 deg 17900 meters ... 4 cm
42.6 deg 20200 meters ... 6 cm


Maximum range = 20300 meters at 43.6 deg elevation