Kończąc cykl poświęcony hipotetycznej flocie japońskiej w
XIX w. na połowie lat 80-tych, prezentuję trzy ostatnie projekty: krążownik
pancerny, krążownik pancernopokładowy (niestety, niezbyt udany bo ani szybki
ani dobrze opancerzony..) oraz specyficzny okręt przeznaczony na jednostkę
flagową flotylli torpedowców – swoim konceptem zbliżony do niemieckich division
boot-ów.
Sagami, japanese armoured cruiser laid down 1882 (Engine 1884)
Barbette ship
Displacement:
4 906 t light; 5 116 t standard; 5 805 t normal; 6 356 t full load
Dimensions: Length overall / water x beam x draught
321,56 ft / 317,88 ft x 47,51 ft x 22,57 ft (normal load)
98,01 m / 96,89 m x 14,48 m x 6,88 m
Armament:
2 - 10,24" / 260 mm guns in single mounts, 471,92lbs / 214,06kg shells, 1882 Model
Breech loading guns in open barbettes
on centreline ends, evenly spread
8 - 5,91" / 150 mm guns in single mounts, 90,62lbs / 41,10kg shells, 1882 Model
Breech loading guns in casemate mounts
on side, all amidships
4 guns in hull casemates - Limited use in all but light seas
12 - 2,24" / 57,0 mm guns in single mounts, 4,97lbs / 2,25kg shells, 1882 Model
Quick firing guns in deck mounts
on side, all amidships
Weight of broadside 1 728 lbs / 784 kg
Shells per gun, main battery: 90
1 - 15,0" / 381 mm above water torpedoes, 2 - 15,0" / 381 mm submerged torpedo tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10,0" / 254 mm 99,11 ft / 30,21 m 6,76 ft / 2,06 m
Ends: Unarmoured
Main Belt covers 48% of normal length
Main belt does not fully cover magazines and engineering spaces
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: - - 11,0" / 279 mm
2nd: 7,99" / 203 mm - -
- Armour deck: 0,98" / 25 mm, Conning tower: 12,01" / 305 mm
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 8 916 ihp / 6 652 Kw = 18,00 kts
Range 4 810nm at 10,00 kts
Bunker at max displacement = 1 240 tons (100% coal)
Complement:
332 - 432
Cost:
£0,599 million / $2,394 million
Distribution of weights at normal displacement:
Armament: 216 tons, 3,7%
Armour: 1 146 tons, 19,7%
- Belts: 356 tons, 6,1%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 506 tons, 8,7%
- Armour Deck: 200 tons, 3,5%
- Conning Tower: 84 tons, 1,4%
Machinery: 1 752 tons, 30,2%
Hull, fittings & equipment: 1 792 tons, 30,9%
Fuel, ammunition & stores: 899 tons, 15,5%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3 100 lbs / 1 406 Kg = 6,6 x 10,2 " / 260 mm shells or 0,6 torpedoes
Stability (Unstable if below 1.00): 1,39
Metacentric height 2,9 ft / 0,9 m
Roll period: 11,7 seconds
Steadiness - As gun platform (Average = 50 %): 84 %
- Recoil effect (Restricted arc if above 1.00): 0,43
Seaboat quality (Average = 1.00): 1,67
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,596
Length to Beam Ratio: 6,69 : 1
'Natural speed' for length: 17,83 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -10,00 degrees
Stern overhang: 3,67 ft / 1,12 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17,03 ft / 5,19 m
- Forecastle (20%): 14,17 ft / 4,32 m
- Mid (50%): 14,17 ft / 4,32 m
- Quarterdeck (15%): 14,17 ft / 4,32 m
- Stern: 14,76 ft / 4,50 m
- Average freeboard: 14,45 ft / 4,40 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 130,7%
- Above water (accommodation/working, high = better): 87,4%
Waterplane Area: 11 004 Square feet or 1 022 Square metres
Displacement factor (Displacement / loading): 91%
Structure weight / hull surface area: 97 lbs/sq ft or 473 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,89
- Longitudinal: 2,77
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
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
Okręty w typie:
Sagami (1884)
Mikawa (1884)
Iwaki (1885)
Iwase (1885)
Mogami, japanese protected cruiser laid down 1883 (Engine 1884)
Displacement:
1 890 t light; 1 969 t standard; 2 259 t normal; 2 490 t full load
Dimensions: Length overall / water x beam x draught
292,22 ft / 290,39 ft x 39,44 ft x 13,62 ft (normal load)
89,07 m / 88,51 m x 12,02 m x 4,15 m
Armament:
2 - 4,72" / 120 mm guns in single mounts, 47,19lbs / 21,41kg shells, 1883 Model
Quick firing guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 4,72" / 120 mm guns in single mounts, 47,19lbs / 21,41kg shells, 1883 Model
Quick firing guns in deck mounts with hoists
on side, all amidships
4 - 2,24" / 57,0 mm guns in single mounts, 5,06lbs / 2,30kg shells, 1883 Model
Quick firing guns in deck mounts
on side, all amidships
Weight of broadside 303 lbs / 138 kg
Shells per gun, main battery: 175
2 - 14,0" / 356 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm - -
2nd: 1,57" / 40 mm - -
- Armour deck: 0,98" / 25 mm, Conning tower: 2,01" / 51 mm
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 4 441 ihp / 3 313 Kw = 17,50 kts
Range 4 500nm at 9,00 kts
Bunker at max displacement = 521 tons (100% coal)
Complement:
163 - 212
Cost:
£0,220 million / $0,881 million
Distribution of weights at normal displacement:
Armament: 38 tons, 1,7%
Armour: 172 tons, 7,6%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 25 tons, 1,1%
- Armour Deck: 140 tons, 6,2%
- Conning Tower: 7 tons, 0,3%
Machinery: 873 tons, 38,6%
Hull, fittings & equipment: 807 tons, 35,7%
Fuel, ammunition & stores: 369 tons, 16,3%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1 289 lbs / 585 Kg = 27,3 x 4,7 " / 120 mm shells or 0,4 torpedoes
Stability (Unstable if below 1.00): 1,55
Metacentric height 2,6 ft / 0,8 m
Roll period: 10,3 seconds
Steadiness - As gun platform (Average = 50 %): 81 %
- Recoil effect (Restricted arc if above 1.00): 0,19
Seaboat quality (Average = 1.00): 1,62
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,507
Length to Beam Ratio: 7,36 : 1
'Natural speed' for length: 17,04 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,84 ft / 0,56 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13,68 ft / 4,17 m
- Forecastle (20%): 9,97 ft / 3,04 m
- Mid (50%): 9,97 ft / 3,04 m
- Quarterdeck (15%): 9,97 ft / 3,04 m
- Stern: 10,63 ft / 3,24 m
- Average freeboard: 10,32 ft / 3,15 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 138,5%
- Above water (accommodation/working, high = better): 84,7%
Waterplane Area: 7 679 Square feet or 713 Square metres
Displacement factor (Displacement / loading): 102%
Structure weight / hull surface area: 69 lbs/sq ft or 337 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,59
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
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
Okręty w typie:
Mogami (1884)
Kitakami (1885)
Jinzu (1885)
Yahagi (1886)
Sazanami, japanese flotilla leader laid down 1885
Displacement:
302 t light; 311 t standard; 390 t normal; 453 t full load
Dimensions: Length overall / water x beam x draught
185,66 ft / 185,66 ft x 20,47 ft x 7,48 ft (normal load)
56,59 m / 56,59 m x 6,24 m x 2,28 m
Armament:
2 - 1,85" / 47,0 mm guns in single mounts, 2,93lbs / 1,33kg shells, 1885 Model
Quick firing guns in deck mounts
on centreline ends, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 250
2 - 15,0" / 381 mm above water torpedoes
Armour:
- Conning tower: 1,46" / 37 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 3 217 ihp / 2 400 Kw = 20,50 kts
Range 2 900nm at 10,00 kts
Bunker at max displacement = 143 tons (100% coal)
Caution: Delicate, lightweight machinery
Complement:
43 - 57
Cost:
£0,042 million / $0,170 million
Distribution of weights at normal displacement:
Armament: 1 tons, 0,2%
Armour: 2 tons, 0,4%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 2 tons, 0,4%
Machinery: 223 tons, 57,2%
Hull, fittings & equipment: 77 tons, 19,6%
Fuel, ammunition & stores: 88 tons, 22,6%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
83 lbs / 37 Kg = 28,2 x 1,9 " / 47 mm shells or 0,1 torpedoes
Stability (Unstable if below 1.00): 1,85
Metacentric height 1,3 ft / 0,4 m
Roll period: 7,7 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 1,16
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,480
Length to Beam Ratio: 9,07 : 1
'Natural speed' for length: 13,63 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 9,88 ft / 3,01 m
- Forecastle (20%): 7,58 ft / 2,31 m
- Mid (50%): 7,58 ft / 2,31 m
- Quarterdeck (15%): 7,58 ft / 2,31 m
- Stern: 8,76 ft / 2,67 m
- Average freeboard: 7,85 ft / 2,39 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 186,2%
- Above water (accommodation/working, high = better): 65,2%
Waterplane Area: 2 382 Square feet or 221 Square metres
Displacement factor (Displacement / loading): 31%
Structure weight / hull surface area: 17 lbs/sq ft or 84 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,46
- Longitudinal: 1,12
- Overall: 0,50
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Okręty w typie:
Sazanami (1885)
Kazagumo (1886)
Kishinami (1886)
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