For laying antisubmarine and torpedo defense nets, but also for maintaining buoys and the like. Should I build one?
[SIZE=3]Carrauntoohil, Irish Net-laying Ship/Boom Defense Vessel laid down 1937[/SIZE]
Displacement:
400 t light; 418 t standard; 565 t normal; 682 t full load
Dimensions: Length overall / water x beam x draught
157.00 ft / 151.00 ft x 30.50 ft x 10.50 ft (normal load)
47.85 m / 46.02 m x 9.30 m x 3.20 m
Armament:
1 - 3.70" / 94.0 mm guns in single mounts, 25.34lbs / 11.50kg shells, 1937 Model
Dual purpose gun in deck mount
on centreline aft
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1937 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 26 lbs / 12 kg
Shells per gun, main battery: 425
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm - -
- Conning tower: 0.79" / 20 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,235 shp / 922 Kw = 15.00 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 264 tons
Complement:
57 - 75
Cost:
£0.118 million / $0.471 million
Distribution of weights at normal displacement:
Armament: 3 tons, 0.6 %
Armour: 3 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 34 tons, 6.1 %
Hull, fittings & equipment: 250 tons, 44.2 %
Fuel, ammunition & stores: 165 tons, 29.1 %
Miscellaneous weights: 110 tons, 19.5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,421 lbs / 645 Kg = 56.1 x 3.7 " / 94 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.47
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.409
Length to Beam Ratio: 4.95 : 1
'Natural speed' for length: 12.29 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.52 ft / 4.12 m
- Forecastle (20 %): 8.60 ft / 2.62 m
- Mid (50 %): 8.60 ft / 2.62 m
- Quarterdeck (15 %): 8.60 ft / 2.62 m
- Stern: 8.60 ft / 2.62 m
- Average freeboard: 8.99 ft / 2.74 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 47.4 %
- Above water (accommodation/working, high = better): 81.9 %
Waterplane Area: 2,850 Square feet or 265 Square metres
Displacement factor (Displacement / loading): 271 %
Structure weight / hull surface area: 55 lbs/sq ft or 269 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.31
- Longitudinal: 6.23
- Overall: 1.53
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily