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Ouaseau Class Minesweeper
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Despite its small size, this minesweeper is capable of accompaning the Fleet on long-range movements.

Ouaseau Class Minesweeper, laid down 1914

Length, 55.0 m x Beam, 7.0 m x Depth, 2.0 m
466 tonnes normal displacement (399 tonnes standard)

Main battery: 3 x 7.5-cm
Secondary battery: 4 x 3.7-cm
AA battery: 4 x 1.3-cm

Weight of broadside: 20 kg

50 tons minesweeping equipment

Hull unarmored

Maximum speed for 3173 shaft kw = 21.00 knots
Approximate cruising radius, 4000 nm / 10 knots

Typical complement: 50-65


Estimated cost, $221,000 (£55,000)

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.

Roomy upper decks; superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 6 tonnes = 1 pct
Machinery ........................ 180 tonnes = 39 pct
Hull and fittings; equipment ..... 150 tonnes = 32 pct
Fuel, ammunition, stores ......... 80 tonnes = 17 pct
Miscellaneous weights ............ 50 tonnes = 11 pct
-----
466 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 386 tonnes
Standard displacement: 399 tonnes
Normal service: 466 tonnes
Full load: 517 tonnes

Loading submergence 276 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.18

Shellfire needed to sink: 135 kg = 23.2 x 7.5-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, 0.18

Relative quality as a seaboat: 1.33

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.60
Sharpness coefficient: 0.39
Hull speed coefficient 'M' = 7.11
'Natural speed' for length = 13.4 knots
Power going to wave formation
at top speed: 68 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 146 percent

Relative accommodation and working space: 128 percent


Displacement factor: 102 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.72
(Structure weight per square
metre of hull surface: 142 kg)

Relative longitudinal hull strength: 2.66
(for 3.50 m average freeboard;
freeboard adjustment +1.00 m)

Relative composite hull strength: 0.82

+++++++++++++++++++++++++


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

180.40 x 22.96 x 6.56; 11.48 -- Dimensions
0.60 -- Block coefficient
1914 -- Year laid down
21.00 / 4000 / 10.00; Turbine, coal fired -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
3 x 2.95; 0 -- Main battery; turrets
Central positioning of guns
:
4 x 1.46; 0 -- Secondary battery; turrets
:
4 x 0.51 -- Tertiary (QF/AA) battery
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
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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