Quote
T1, Japan Minesweeper laid down 1898 Virtuous Class
Displacement:
178 t light; 185 t standard; 192 t normal; 197 t full load
Dimensions: Length overall / water x beam x draught
131.23 ft / 131.23 ft x 17.72 ft x 7.22 ft (normal load)
40.00 m / 40.00 m x 5.40 m x 2.20 m
Armament:
2 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.08kg shells, 1898 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread
Weight of broadside 27 lbs / 12 kg
Shells per gun, main battery: 200
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 484 ihp / 361 Kw = 14.00 kts
Range 1,500nm at 6.00 kts
Bunker at max displacement = 13 tons (100% coal)
Complement:
25 - 33
Cost:
£0.019 million / $0.074 million
Distribution of weights at normal displacement:
Armament: 3 tons, 1.7 %
Machinery: 68 tons, 35.6 %
Hull, fittings & equipment: 66 tons, 34.5 %
Fuel, ammunition & stores: 14 tons, 7.2 %
Miscellaneous weights: 40 tons, 20.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
87 lbs / 40 Kg = 6.5 x 3.0 " / 76 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.4 ft / 0.1 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.26
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.400
Length to Beam Ratio: 7.41 : 1
'Natural speed' for length: 11.46 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 8.20 ft / 2.50 m
- Forecastle (20 %): 4.92 ft / 1.50 m
- Mid (50 %): 4.92 ft / 1.50 m
- Quarterdeck (15 %): 4.92 ft / 1.50 m
- Stern: 4.92 ft / 1.50 m
- Average freeboard: 5.18 ft / 1.58 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 151.6 %
- Above water (accommodation/working, high = better): 50.7 %
Waterplane Area: 1,353 Square feet or 126 Square metres
Displacement factor (Displacement / loading): 86 %
Structure weight / hull surface area: 28 lbs/sq ft or 138 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.44
- Overall: 1.03
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily
Ships:
T1 Desheng (Virtuous Victory) (6)