MS-1917, Maori Minesweeper laid down 1912
Displacement:
333 t light; 344 t standard; 502 t normal; 629 t full load
Dimensions: Length overall / water x beam x draught
195.00 ft / 190.29 ft x 19.69 ft x 9.84 ft (normal load)
59.44 m / 58.00 m x 6.00 m x 3.00 m
Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 13.23lbs / 6.00kg shells, 1912 Model
Quick firing gun in a deck mount with hoist
on centreline aft
Weight of broadside 13 lbs / 6 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm 0.39" / 10 mm -
Machinery:
Oil fired boilers, complex reciprocating steam engines,
Electric motors, 2 shafts, 2,077 ihp / 1,549 Kw = 18.00 kts
Range 5,000nm at 14.00 kts
Bunker at max displacement = 284 tons
Complement:
52 - 68
Cost:
£0.031 million / $0.122 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Armour: 1 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 125 tons, 24.9 %
Hull, fittings & equipment: 180 tons, 35.9 %
Fuel, ammunition & stores: 170 tons, 33.7 %
Miscellaneous weights: 25 tons, 5.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
746 lbs / 338 Kg = 58.0 x 3.0 " / 75 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 0.7 ft / 0.2 m
Roll period: 10.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.12
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.477
Length to Beam Ratio: 9.67 : 1
'Natural speed' for length: 13.79 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (15 %): 16.40 ft / 5.00 m
- Mid (28 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 10.50 ft / 3.20 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 89.3 %
- Above water (accommodation/working, high = better): 87.1 %
Waterplane Area: 2,445 Square feet or 227 Square metres
Displacement factor (Displacement / loading): 174 %
Structure weight / hull surface area: 29 lbs/sq ft or 143 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.94
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
25 tons paravanes and other sweeping gear
333t/Light = 3/BP x4 for merchant construction = 12/BP