Why does China need an icebreaker? Ah who cares...
Australia can offer this design. Already in service with the RAN.
HMAS Discovery, Australia Antartic Research Vessel laid down 1931
Displacement:
1,714 t light; 1,771 t standard; 2,634 t normal; 3,325 t full load
Dimensions: Length overall / water x beam x draught
320.00 ft / 320.00 ft x 42.00 ft x 14.00 ft (normal load)
97.54 m / 97.54 m x 12.80 m x 4.27 m
Armament:
1 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1931 Model
Breech loading gun in deck mount
on centreline forward
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1931 Model
Breech loading guns in deck mounts
on centreline, evenly spread, 1 raised mount
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1931 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 62 lbs / 28 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.20" / 30 mm 320.00 ft / 97.54 m 9.00 ft / 2.74 m
Ends: Unarmoured
Main Belt covers 154 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.20" / 30 mm - -
Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 2 shafts, 8,996 shp / 6,711 Kw = 21.00 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 1,553 tons
Complement:
183 - 239
Cost:
£0.454 million / $1.817 million
Distribution of weights at normal displacement:
Armament: 8 tons, 0.3 %
Armour: 131 tons, 5.0 %
- Belts: 128 tons, 4.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 269 tons, 10.2 %
Hull, fittings & equipment: 1,066 tons, 40.5 %
Fuel, ammunition & stores: 920 tons, 34.9 %
Miscellaneous weights: 240 tons, 9.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,599 lbs / 3,447 Kg = 146.4 x 4.7 " / 119 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.31
Metacentric height 2.2 ft / 0.7 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.54
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.490
Length to Beam Ratio: 7.62 : 1
'Natural speed' for length: 17.89 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 46
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: 15.00 ft / 4.57 m
- Forecastle (20 %): 14.00 ft / 4.27 m
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 12.00 ft / 3.66 m (14.00 ft / 4.27 m before break)
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 13.78 ft / 4.20 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.6 %
- Above water (accommodation/working, high = better): 129.3 %
Waterplane Area: 8,874 Square feet or 824 Square metres
Displacement factor (Displacement / loading): 271 %
Structure weight / hull surface area: 75 lbs/sq ft or 366 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.25
- Longitudinal: 2.59
- Overall: 1.35
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
***
Also Australia could be willing to sell this class of 4:
Polar Bear
Polar Light
Snow-White
Snow Flake
Polar Bear class, Australia (ex-SAE) Artic Sloop laid down 1911 (reffited 1921)
Displacement:
822 t light; 850 t standard; 1.246 t normal; 1.557 t full load
Loading submergence 132 tons/feet
Dimensions:
221,46 ft x 31,17 ft x 11,48 ft (normal load)
67,50 m x 9,50 m x 3,50 m
Armament:
2 - 3,46" / 88 mm guns
4 - 0,79" / 20 mm guns
Weight of broadside 43 lbs / 19 kg
Armour:
Belt 0,39" / 10 mm, end belts 0,98" / 25 mm
Belts cover 67% of normal area
Main gun shields 0,98" / 25 mm, Light gun shields 0,39" / 10 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2.011 ihp / 1.500 Kw = 15,49 kts
Range 11.800nm at 10,00 kts
Complement:
104 - 136
Cost:
£0,052 million / $0,208 million
Distribution of weights at normal displacement:
Armament: 5 tons, 0,4%
Armour: 26 tons, 2,1%
Belts: 24 tons, 1,9%, Armament: 2 tons, 0,2%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 134 tons, 10,7%
Hull, fittings & equipment: 357 tons, 28,7%
Fuel, ammunition & stores: 424 tons, 34,0%
Miscellaneous weights: 300 tons, 24,1%
Metacentric height 1,1
Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,16
Shellfire needed to sink: 2.279 lbs / 1.034 Kg = 109,6 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 74 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,05
Relative quality as seaboat: 2,00
Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,29
'Natural speed' for length: 14,88 kts
Power going to wave formation at top speed: 49 %
Trim: 37
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 65,2%
Relative accommodation and working space: 97,3%
(Average = 100%)
Displacement factor: 196%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,96
(Structure weight / hull surface area: 45 lbs / square foot or 219 Kg / square metre)
Relative longitudinal hull strength: 2,53
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,50 ft)
Relative composite hull strength: 1,05