River Monitors

Logi · November 13, 2008, 05:15:17 PM

QuoteQH Jiangzi, Middle Kingdom river monitor laid down 1889
Central citadel ship

Displacement:
926 t light; 977 t standard; 996 t normal; 1.012 t full load

Dimensions: Length overall / water x beam x draught
196,85 ft / 196,85 ft x 32,81 ft x 6,56 ft (normal load)
60,00 m / 60,00 m x 10,00 m x 2,00 m

Armament:
2 - 5,51" / 140 mm guns in single mounts, 82,47lbs / 37,41kg shells, 1889 Model
Breech loading guns in turrets (on barbettes)
on centreline, all amidships
6 - 2,95" / 75,0 mm guns in single mounts, 12,68lbs / 5,75kg shells, 1889 Model
Breech loading guns in casemate mounts
on side ends, evenly spread
10 - 0,98" / 25,0 mm guns in single mounts, 0,47lbs / 0,21kg shells, 1889 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 246 lbs / 111 kg
Shells per gun, main battery: 200
1 - 14,0" / 355,6 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,15" / 80 mm 196,85 ft / 60,00 m 6,14 ft / 1,87 m
Ends: Unarmoured
Main Belt covers 154% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3,15" / 80 mm 1,57" / 40 mm 1,57" / 40 mm
2nd: 3,15" / 80 mm - -
3rd: 0,79" / 20 mm - -

- Armour deck: 2,36" / 60 mm

Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 418 ihp / 312 Kw = 10,00 kts
Range 1.500nm at 5,00 kts
Bunker at max displacement = 36 tons (100% coal)

Complement:
88 - 115

Cost:
£0,070 million / $0,278 million

Distribution of weights at normal displacement:
Armament: 31 tons, 3,1%
Armour: 448 tons, 45,0%
- Belts: 141 tons, 14,1%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 54 tons, 5,4%
- Armour Deck: 254 tons, 25,5%
- Conning Tower: 0 tons, 0,0%
Machinery: 81 tons, 8,2%
Hull, fittings & equipment: 366 tons, 36,7%
Fuel, ammunition & stores: 70 tons, 7,1%
Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2.112 lbs / 958 Kg = 25,6 x 5,5 " / 140 mm shells or 1,2 torpedoes
Stability (Unstable if below 1.00): 1,27
Metacentric height 1,4 ft / 0,4 m
Roll period: 11,5 seconds
Steadiness - As gun platform (Average = 50 %): 87 %
- Recoil effect (Restricted arc if above 1.00): 0,23
Seaboat quality (Average = 1.00): 1,21

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,823
Length to Beam Ratio: 6,00 : 1
'Natural speed' for length: 14,03 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 72
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: 6,56 ft / 2,00 m
- Forecastle (20%): 6,56 ft / 2,00 m
- Mid (50%): 6,56 ft / 2,00 m
- Quarterdeck (15%): 6,56 ft / 2,00 m
- Stern: 6,56 ft / 2,00 m
- Average freeboard: 6,56 ft / 2,00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 54,8%
- Above water (accommodation/working, high = better): 82,5%
Waterplane Area: 5.805 Square feet or 539 Square metres
Displacement factor (Displacement / loading): 116%
Structure weight / hull surface area: 52 lbs/sq ft or 252 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,03
- Longitudinal: 1,17
- Overall: 1,05
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Monitors with casemated secondairy guns. Name means "River Class". 20 ships. Last one is put to the water in 1893.

Ships:
Jiangzi (River Class) 1889
Jiangping (Tranquility of the River) 1890
Jiang'an (Peace of the River) 1890
Zhujiang (Pearl River) 1891
Jiangcai (Fortune of the River) 1892
Jiangbaozhen (Treasure of the River) 1892
Juanjiang (Graceful River) 1892
Jiangxing (Prosperity of the River) 1893

Logi · November 13, 2008, 05:16:03 PM

QuoteRenzi class, Middle Kingdom river monitor laid down 1904

Displacement:
965 t light; 1.001 t standard; 1.021 t normal; 1.037 t full load

Dimensions: Length overall / water x beam x draught
201,77 ft / 201,77 ft x 32,81 ft x 6,56 ft (normal load)
61,50 m / 61,50 m x 10,00 m x 2,00 m

Armament:
2 - 5,51" / 140 mm guns in single mounts, 83,72lbs / 37,98kg shells, 1904 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
6 - 2,95" / 75,0 mm guns in single mounts, 12,87lbs / 5,84kg shells, 1904 Model
Breech loading guns in casemate mounts
on side ends, evenly spread, all raised mounts - superfiring
10 - 0,98" / 25,0 mm guns in single mounts, 0,48lbs / 0,22kg shells, 1904 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 249 lbs / 113 kg
Shells per gun, main battery: 100
2 - 20,0" / 508 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,15" / 80 mm 196,85 ft / 60,00 m 6,56 ft / 2,00 m
Ends: Unarmoured
Upper: 3,15" / 80 mm 65,62 ft / 20,00 m 5,91 ft / 1,80 m
Main Belt covers 150% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3,15" / 80 mm 3,15" / 80 mm 1,57" / 40 mm
2nd: 3,15" / 80 mm - -
3rd: 0,79" / 20 mm - -

- Armour deck: 2,36" / 60 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 1 shaft, 419 shp / 312 Kw = 10,00 kts
Range 1.500nm at 5,00 kts
Bunker at max displacement = 36 tons (100% coal)

Complement:
89 - 117

Cost:
£0,066 million / $0,263 million

Distribution of weights at normal displacement:
Armament: 31 tons, 3,1%
Armour: 553 tons, 54,1%
- Belts: 229 tons, 22,4%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 64 tons, 6,3%
- Armour Deck: 260 tons, 25,5%
- Conning Tower: 0 tons, 0,0%
Machinery: 42 tons, 4,1%
Hull, fittings & equipment: 340 tons, 33,2%
Fuel, ammunition & stores: 56 tons, 5,5%
Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2.714 lbs / 1.231 Kg = 32,4 x 5,5 " / 140 mm shells or 1,7 torpedoes
Stability (Unstable if below 1.00): 1,18
Metacentric height 1,3 ft / 0,4 m
Roll period: 12,2 seconds
Steadiness - As gun platform (Average = 50 %): 85 %
- Recoil effect (Restricted arc if above 1.00): 0,27
Seaboat quality (Average = 1.00): 1,18

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,823
Length to Beam Ratio: 6,15 : 1
'Natural speed' for length: 14,20 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 72
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: 6,56 ft / 2,00 m
- Forecastle (20%): 6,56 ft / 2,00 m
- Mid (50%): 6,56 ft / 2,00 m
- Quarterdeck (15%): 6,56 ft / 2,00 m
- Stern: 6,56 ft / 2,00 m
- Average freeboard: 6,56 ft / 2,00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 42,8%
- Above water (accommodation/working, high = better): 83,6%
Waterplane Area: 5.950 Square feet or 553 Square metres
Displacement factor (Displacement / loading): 115%
Structure weight / hull surface area: 47 lbs/sq ft or 228 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,02
- Longitudinal: 1,13
- Overall: 1,03
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

Monitor with casemated secondairy guns

Ships:
Ren-Ben-Zhi ("Tenacious Character") laid down Q4 1904

River Monitors

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