Exploration
4 x Uji class (1907), REFITTED
8 built, 4 SUNK, 4 REFITTED to different configuration
(https://upload.wikimedia.org/wikipedia/commons/b/b3/IJN_gunboat_UJI%28I%29_in_1903.jpg)
Uji class, Japan Exploration Ship laid down 1907
Displacement:
700 t light; 725 t standard; 885 t normal; 1,013 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(270.00 ft / 270.00 ft) x 31.00 ft x (7.40 / 8.20 ft)
(82.30 m / 82.30 m) x 9.45 m x (2.26 / 2.50 m)
Armament:
1 - 3.00" / 76.2 mm 45.0 cal gun - 13.62lbs / 6.18kg shells, 400 per gun
Quick firing gun in deck mount, 1907 Model
1 x Single mount on centreline, forward deck centre
3 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 150 per gun
Quick firing guns in deck mount, 1907 Model
1 x Triple mount on centreline, aft deck centre
1 raised mount
30 - 0.30" / 7.6 mm 45.0 cal guns - 0.01lbs / 0.01kg shells, 150 per gun (marine rifles)
Breech loading guns in deck mounts, 1907 Model
30 x Single mounts on sides, evenly spread
Weight of broadside 26 lbs / 12 kg
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 1.00" / 25 mm - -
- Conning towers: Forward 1.00" / 25 mm, Aft 1.00" / 25 mm
Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2,161 ihp / 1,612 Kw = 17.00 kts
Range 5,700nm at 10.00 kts
Bunker at max displacement = 288 tons (90% coal)
Complement:
80 - 105
Cost:
£0.060 million / $0.241 million
Distribution of weights at normal displacement:
Armament: 8 tons, 0.9 %
- Guns: 8 tons, 0.9 %
Armour: 8 tons, 0.9 %
- Armament: 4 tons, 0.5 %
- Conning Towers: 4 tons, 0.4 %
Machinery: 238 tons, 26.9 %
Hull, fittings & equipment: 320 tons, 36.2 %
Fuel, ammunition & stores: 185 tons, 20.9 %
Miscellaneous weights: 125 tons, 14.1 %
- On freeboard deck: 90 tons
- Above deck: 35 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,479 lbs / 671 Kg = 109.5 x 3.0 " / 76 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.35
Metacentric height 1.5 ft / 0.4 m
Roll period: 10.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.50
Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.500 / 0.516
Length to Beam Ratio: 8.71 : 1
'Natural speed' for length: 16.43 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 35.00 %, 11.00 ft / 3.35 m, 9.00 ft / 2.74 m
- Forward deck: 30.00 %, 9.00 ft / 2.74 m, 9.00 ft / 2.74 m
- Aft deck: 20.00 %, 9.00 ft / 2.74 m, 9.00 ft / 2.74 m
- Quarter deck: 15.00 %, 9.00 ft / 2.74 m, 9.00 ft / 2.74 m
- Average freeboard: 9.28 ft / 2.83 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 91.1 %
- Above water (accommodation/working, high = better): 119.5 %
Waterplane Area: 5,577 Square feet or 518 Square metres
Displacement factor (Displacement / loading): 140 %
Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.18
- Overall: 1.01
Adequate machinery, storage, compartmentation space
Adequate accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
35t - 1 x short-range and 1 x long-range wireless
60t - 30 x marines
10t - 5 x person, heavy weapons team
20t - 2 x 5t boats