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
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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
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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
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[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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