Tatsuta, japanese monitor laid down 1865 (Engine 1866)
Displacement:
1 445 t light; 1 556 t standard; 1 620 t normal; 1 671 t full load
Dimensions: Length overall / water x beam x draught
211,29 ft / 211,29 ft x 44,29 ft x 10,50 ft (normal load)
64,40 m / 64,40 m x 13,50 m x 3,20 m
Armament:
4 - 8,27" / 210 mm guns (2x2 guns), 176,61lbs / 80,11kg shells, 1865 Model
Muzzle loading guns in Coles/Ericsson turrets
on centreline ends, evenly spread
Weight of broadside 706 lbs / 320 kg
Shells per gun, main battery: 200
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4,72" / 120 mm 211,29 ft / 64,40 m 5,25 ft / 1,60 m
Ends: Unarmoured
Main Belt covers 154% of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4,13" / 105 mm 3,15" / 80 mm -
- Armour deck: 1,46" / 37 mm, Conning tower: 4,72" / 120 mm
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 352 ihp / 263 Kw = 8,50 kts
Range 2 000nm at 5,00 kts
Bunker at max displacement = 115 tons (100% coal)
Complement:
126 - 165
Cost:
£0,138 million / $0,552 million
Distribution of weights at normal displacement:
Armament: 88 tons, 5,5%
Armour: 455 tons, 28,1%
- Belts: 194 tons, 12,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 71 tons, 4,4%
- Armour Deck: 176 tons, 10,9%
- Conning Tower: 14 tons, 0,9%
Machinery: 95 tons, 5,8%
Hull, fittings & equipment: 807 tons, 49,8%
Fuel, ammunition & stores: 175 tons, 10,8%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1 311 lbs / 595 Kg = 7,4 x 8,3 " / 210 mm shells or 0,7 torpedoes
Stability (Unstable if below 1.00): 1,49
Metacentric height 2,9 ft / 0,9 m
Roll period: 10,9 seconds
Steadiness - As gun platform (Average = 50 %): 29 %
- Recoil effect (Restricted arc if above 1.00): 0,08
Seaboat quality (Average = 1.00): 0,31
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,577
Length to Beam Ratio: 4,77 : 1
'Natural speed' for length: 14,54 kts
Power going to wave formation at top speed: 25 %
Trim (Max stability = 0, Max steadiness = 100): 54
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: 2,95 ft / 0,90 m
- Forecastle (20%): 2,95 ft / 0,90 m
- Mid (50%): 2,95 ft / 0,90 m
- Quarterdeck (15%): 2,95 ft / 0,90 m
- Stern: 2,95 ft / 0,90 m
- Average freeboard: 2,95 ft / 0,90 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63,1%
- Above water (accommodation/working, high = better): 29,1%
Waterplane Area: 6 527 Square feet or 606 Square metres
Displacement factor (Displacement / loading): 120%
Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,03
- Longitudinal: 0,99
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability
Tatsuta (1866)
Chikuma (1866)
Uji (1867)
Noshiro (1867)
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