My plans for a Mine Warfare Squadron are like this:
The 1928 cruiser-minelayer (
Pluton-type) will act as squadron flagship. The squadron will be split into two flotillas, each consisting of one of the 1929 cruiser-minelayers (which I've posted previously) as leader and four
Rabihorcado-class destroyers, which I will begin rebuilding in 1931 as fast minesweepers ("destroyer-minesweepers" officially), to the following design
Rabihorcado-class as built:
Armament:
2 - 4.00" / 102 mm (2x1)
4 - 2.24" / 57.0 mm (2x2)
3 - 0.98" / 25.0 mm (3x1)
2 - 0.50" / 12.7 mm (2x1)
2 - 0.30" / 7.62 mm (2x1)
Weight of broadside 90 lbs / 41 kg
Shells per gun, main battery: 150
4 - 18.0" / 457.2 mm above water torpedoes
Depth charges @ 550lb each: 35
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 39,975 shp / 29,821 Kw = 32.76 kts
Range 4,375nm at 12.00 kts (Bunkerage = 222 tons)
Rabihorcado-class rebuilt as fast minesweeper:
Filipino Rabihorcado-class destroyer minesweeper, laid down 1923 (Engine 1931)
Displacement:
1,399 t light; 1,439 t standard; 1,574 t normal; 1,683 t full load
Dimensions: Length overall / water x beam x draught
309.64 ft / 300.00 ft x 32.00 ft x 14.00 ft (normal load)
94.38 m / 91.44 m x 9.75 m x 4.27 m
Armament:
4 - 2.95" / 75.0 mm guns (2x2 guns), 13.00lbs / 5.90kg shells, 1923 Model
Dual purpose guns in deck mounts with hoists
on centreline, all forward, 1 raised mount - superfiring
3 - 0.98" / 25.0 mm guns (1x3 guns), 0.57lbs / 0.26kg shells, 1923 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
8 - 0.54" / 13.7 mm guns (4x2 guns), 0.11lbs / 0.05kg shells, 1923 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
Weight of broadside 55 lbs / 25 kg
Shells per gun, main battery: 250
2 - 24.0" / 610 mm above water torpedoes
Mines @ 1,000lbs each: 60
Depth charges @ 550lb each: 75
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.59" / 15 mm 0.98" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 39,921 shp / 29,781 Kw = 32.75 kts
Range 5,250nm at 12.00 kts (Bunkerage = 244 tons)
Complement:
124 - 162
Cost:
£0.513 million / $2.053 million
Distribution of weights at normal displacement:
Armament: 7 tons, 0.4 %
Armour: 6 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 870 tons, 55.3 %
Hull, fittings & equipment: 466 tons, 29.6 %
Fuel, ammunition & stores: 175 tons, 11.1 %
Miscellaneous weights: 50 tons, 3.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
410 lbs / 186 Kg = 31.8 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.3 ft / 0.4 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.08
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.410
Length to Beam Ratio: 9.38 : 1
'Natural speed' for length: 17.32 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 16.30 ft / 4.97 m
- Mid (50 %): 15.00 ft / 4.57 m
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 15.83 ft / 4.83 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 185.4 %
- Above water (accommodation/working, high = better): 113.5 %
Waterplane Area: 5,945 Square feet or 552 Square metres
Displacement factor (Displacement / loading): 63 %
Structure weight / hull surface area: 34 lbs/sq ft or 164 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.83
- Overall: 0.61
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform