WesWorld

Belomore-class Icebreaker
- Belomore
- Georgy Sedov
- Sibir
- Buran
- Pozharsky
- Stepan Malygin
- Svyatogor
- Yamal
- Shkval
- Sneg
- Vaygach
- Alexsei Chirikov
- Sankt-Peterburg
- Yermak
- Purga
- Kareliya
- Solovei Budemirochich
- Metel'
- Kuzma Minin
- Tikhaya

Arctica-class (Project 07) Icebreaker
- Arctica
- Barentsevo
- Karskoye
- Laptevykh

Admiral Rodzhestvenskiy-class (Project 30) Icebreaker
- Admiral Rodzhestvenskiy
- Admiral Felkerzam
- Admiral Nebogatov

Lena-class (Project 62) Icebreaker
- Lena
- Angara

Gavrila Derzhavin-class (Project 74) Harbour Icebreaker
- Gavrila Derzhavin
- Alexander Bestuzhev
- Marina Tsvetaeva
- Nikolay Nekrasov

Yenesei-class Icebreakers
- Yenesei
- Ob
- Irtysh
- Argun

Belomore Class Port Icebreaker, laid down 1917
Length, 85.0 m x Beam, 25.0 m x Depth, 4.5 m
4821 tonnes normal displacement (4572 tonnes standard)
Main battery: 2 x 0.7-cm
Weight of broadside: 0 kg
Main belt, 5.0 cm; bow and stern, 10.0 cm
Torpedo bulkhead, 5.0 cm
Maximum speed for 9870 shaft kw = 20.00 knots
Approximate cruising radius, 6000 nm / 10 knots
Typical complement: 289-376
Estimated cost, $1.633 million (£408,000)
Remarks:
Oil firing.
Magazines and engineering spaces are roomy, with superior
watertight subdivision.
Ship is roomy, with superior accommodation and working space.
Distribution of weights:
Percent
normal
displacement:
Armor, total ..................... 539 tonnes = 11 pct
Belt 344 tonnes = 7 pct
Torpedo bulkhead 195 tonnes = 4 pct
Machinery ........................ 485 tonnes = 10 pct
Hull and fittings; equipment ..... 3452 tonnes = 72 pct
Fuel, ammunition, stores ......... 345 tonnes = 7 pct
Miscellaneous weights ............ 0 tonnes = 0 pct
-----
4821 tonnes = 100 pct
Estimated metacentric height, 1.8 m
Displacement summary:
Light ship: 4475 tonnes
Standard displacement: 4572 tonnes
Normal service: 4821 tonnes
Full load: 5000 tonnes
Loading submergence 1347 tonnes/metre
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.31
Shellfire needed to sink: 7795 kg = 1562354.2 x 0.7-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 5.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 55 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.00
Relative quality as a seaboat: 1.10
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.50
Sharpness coefficient: 0.47
Hull speed coefficient 'M' = 5.05
'Natural speed' for length = 16.7 knots
Power going to wave formation
at top speed: 64 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 45 percent
Relative accommodation and working space: 202 percent
Displacement factor: 320 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.86
(Structure weight per square
metre of hull surface: 848 kg)
Relative longitudinal hull strength: 9.30
(for 6.50 m average freeboard;
freeboard adjustment +2.51 m)
Relative composite hull strength: 2.18
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
278.80 x 82.00 x 14.76; 21.32 -- Dimensions
0.50 -- Block coefficient
1917 -- Year laid down
20.00 / 6000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
0 tons -- Miscellaneous weights
++++++++++
2 x 0.28; 0 -- Main battery; turrets
Central positioning of guns
:
0 -- No secondary battery
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
1.97 / 3.94 / 0.00 / 1.97; 100 -- Belt armor; relative extent
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor
(Note: For portability, values are stored in Anglo-American units)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Ships in Class:
- Belomore
- Georgy Sedov
- Sibir
- Buran
- Pozharsky
- Stepan Malygin
- Svyatogor
- Yamal
- Shkval
- Sneg
- Vaygach
- Alexsei Chirikov
- Sankt-Peterburg
- Yermak
- Purga
- Kareliya
- Solovei Budemirochich
- Metel'
- Kuzma Minin
- Tikhaya

Arctica class Icebreakers, laid down 1922
Length, 170.0 m x Beam, 33.0 m x Depth, 5.5 m
15243 tonnes normal displacement (11075 tonnes standard)
Main battery: 4 x 13.0-cm (2 x 2)
AA battery: 8 x 3.7-cm
Light battery: 4 x 1.3-cm
Weight of broadside: 128 kg
Main belt, 5.0 cm; bow and stern, 10.0 cm
Torpedo bulkhead, 10.0 cm
Battery armor:
Main, 2.5 cm
AA, 2.5 cm shields
Aircraft - 3 Sea/Skiplanes, 1 Catapult
Cargo - 1000 tons
Maximum speed for 21312 shaft kw = 22.00 knots
Approximate cruising radius, 22200 nm / 15 knots
Typical complement: 343-446
Estimated cost, $5.905 million (£1.476 million)
Remarks:
Relative extent of belt armor, 50 percent of 'typical' coverage.
Good seaboat; rides out heavy weather easily.
Magazines and engineering spaces are roomy, with superior
watertight subdivision.
Ship is roomy, with superior accommodation and working space.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 35 tonnes = 0 pct
Armor, total ..................... 1362 tonnes = 9 pct
Belt 377 tonnes = 2 pct
Torpedo bulkhead 953 tonnes = 6 pct
Armament 31 tonnes = 0 pct
Machinery ........................ 969 tonnes = 6 pct
Hull and fittings; equipment ..... 7306 tonnes = 48 pct
Fuel, ammunition, stores ......... 4496 tonnes = 29 pct
Miscellaneous weights ............ 1075 tonnes = 7 pct
-----
15243 tonnes = 100 pct
Estimated metacentric height, 5.1 m
Displacement summary:
Light ship: 10747 tonnes
Standard displacement: 11075 tonnes
Normal service: 15243 tonnes
Full load: 18517 tonnes
Loading submergence 3507 tonnes/metre
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.99
Shellfire needed to sink: 27097 kg = 888.3 x 13.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 18.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 47 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.00
Relative quality as a seaboat: 1.21
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.49
Sharpness coefficient: 0.41
Hull speed coefficient 'M' = 6.88
'Natural speed' for length = 23.6 knots
Power going to wave formation
at top speed: 44 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 39 percent
Relative accommodation and working space: 171 percent
Displacement factor: 327 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.50
(Structure weight per square
metre of hull surface: 783 kg)
Relative longitudinal hull strength: 1.50
(for 5.02 m average freeboard)
Relative composite hull strength: 1.50
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
557.60 x 108.24 x 18.04; 16.47 -- Dimensions
0.49 -- Block coefficient
1922 -- Year laid down
22.00 / 22200 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
1075 tons -- Miscellaneous weights
++++++++++
4 x 5.12; 2; 0 -- Main battery; turrets; superfiring
:
0 -- No secondary battery
8 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
1.97 / 3.94 / 0.00 / 3.94; 50 -- Belt armor; relative extent
0.00 / 0.00 -- Deck / CT
0.98 / 0.00 / 0.98 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Ships in Class:
- Arctica
- Barentsevo
- Karskoye
- Laptevykh

Note: Names not known, so I assigned my own.

Rodzhestvenskiy class, Russian Icebreaker laid down 1929

Displacement:
26,624 t light; 27,945 t standard; 64,220 t normal; 93,240 t full load

Dimensions: Length overall / water x beam x draught
661.72 ft / 656.17 ft x 114.83 ft (Bulges 127.95 ft) x 33.46 ft (normal load)
201.69 m / 200.00 m x 35.00 m (Bulges 39.00 m) x 10.20 m

Armament:
4 - 5.12" / 130 mm guns (2x2 guns), 79.37lbs / 36.00kg shells, 1929 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 2.95" / 75.0 mm guns (2x2 guns), 15.43lbs / 7.00kg shells, 1929 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1929 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread
Weight of broadside 404 lbs / 183 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 492.13 ft / 150.00 m 34.45 ft / 10.50 m
Ends: 3.54" / 90 mm 98.43 ft / 30.00 m 34.45 ft / 10.50 m
65.62 ft / 20.00 m Unarmoured ends
Main Belt covers 115 % of normal length

- Torpedo Bulkhead and Bulges:
1.97" / 50 mm 524.93 ft / 160.00 m 33.46 ft / 10.20 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.20" / 5 mm -
2nd: 0.98" / 25 mm 0.20" / 5 mm -
3rd: 0.98" / 25 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 49,478 shp / 36,911 Kw = 20.00 kts
Range 42,300nm at 20.00 kts
Bunker at max displacement = 65,295 tons

Complement:
403 - 524

Cost:
£4.723 million / $18.892 million

Distribution of weights at normal displacement:
Armament: 43 tons, 0.1 %
Armour: 2,900 tons, 4.5 %
- Belts: 1,603 tons, 2.5 %
- Torpedo bulkhead: 1,279 tons, 2.0 %
- Armament: 18 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,520 tons, 2.4 %
Hull, fittings & equipment: 18,062 tons, 28.1 %
Fuel, ammunition & stores: 37,596 tons, 58.5 %
Miscellaneous weights: 4,100 tons, 6.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
421,899 lbs / 191,370 Kg = 6,293.7 x 5.1 " / 130 mm shells or 193.5 torpedoes
Stability (Unstable if below 1.00): 2.13
Metacentric height 20.1 ft / 6.1 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.65

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.800
Length to Beam Ratio: 5.13 : 1
'Natural speed' for length: 25.62 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.50 ft / 9.60 m
- Forecastle (20 %): 22.31 ft / 6.80 m
- Mid (50 %): 22.31 ft / 6.80 m (14.44 ft / 4.40 m aft of break)
- Quarterdeck (15 %): 14.44 ft / 4.40 m
- Stern: 14.44 ft / 4.40 m
- Average freeboard: 19.11 ft / 5.82 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 20.6 %
- Above water (accommodation/working, high = better): 112.4 %
Waterplane Area: 65,847 Square feet or 6,117 Square metres
Displacement factor (Displacement / loading): 618 %
Structure weight / hull surface area: 207 lbs/sq ft or 1,011 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.50
- Longitudinal: 1.50
- Overall: 1.50
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weights:
4 Sea/Skiplanes, 2 catapults
400 tons extra accomodations
3000 tons supplies

Ships in Class:
- Admiral Rodzhestvenskiy
- Admiral Felkerzam
- Admiral Nebogatov

Lena class, Russian Icebreaker laid down 1940

Displacement:
13,497 t light; 13,889 t standard; 19,623 t normal; 24,210 t full load

Dimensions: Length overall / water x beam x draught
567.30 ft / 557.74 ft x 104.99 ft x 18.04 ft (normal load)
172.91 m / 170.00 m x 32.00 m x 5.50 m

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 393.70 ft / 120.00 m 19.69 ft / 6.00 m
Ends: 3.94" / 100 mm 164.04 ft / 50.00 m 19.69 ft / 6.00 m
Main Belt covers 109 % of normal length

- Torpedo Bulkhead:
1.18" / 30 mm 393.70 ft / 120.00 m 16.40 ft / 5.00 m

Machinery:
Coal fired boilers, steam turbines,
Geared drive, 2 shafts, 53,619 shp / 40,000 Kw = 24.38 kts
Range 6,200nm at 24.00 kts
Bunker at max displacement = 10,320 tons (100% coal)

Complement:
828 - 1,077

Cost:
£4.159 million / $16.636 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 1,423 tons, 7.3 %
- Belts: 1,140 tons, 5.8 %
- Torpedo bulkhead: 282 tons, 1.4 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,577 tons, 8.0 %
Hull, fittings & equipment: 8,497 tons, 43.3 %
Fuel, ammunition & stores: 6,126 tons, 31.2 %
Miscellaneous weights: 2,000 tons, 10.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
71,554 lbs / 32,456 Kg = 662.5 x 6 " / 152 mm shells or 16.3 torpedoes
Stability (Unstable if below 1.00): 1.68
Metacentric height 12.7 ft / 3.9 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.03

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.650
Length to Beam Ratio: 5.31 : 1
'Natural speed' for length: 23.62 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (50 %): 17.39 ft / 5.30 m
- Quarterdeck (15 %): 17.39 ft / 5.30 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 18.77 ft / 5.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 47.7 %
- Above water (accommodation/working, high = better): 184.9 %
Waterplane Area: 44,857 Square feet or 4,167 Square metres
Displacement factor (Displacement / loading): 298 %
Structure weight / hull surface area: 157 lbs/sq ft or 768 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.50
- Longitudinal: 1.50
- Overall: 1.50
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

Notes:
Speed is modified to produce the desired engine power and hull stress. Actual top speed is 20 kts. Actual seakeeping/stability at 20 kts is 1.32/1.65

Ships in Class:
- Lena
- Angara (very slightly modified sistership, 13469t light)

Gavrila Derzhavin-class (Project 74), Russian Harbor Icebreaker laid down 1944

Displacement:
1,496 t light; 1,538 t standard; 1,951 t normal; 2,281 t full load

Dimensions: Length overall / water x beam x draught
221.68 ft / 213.25 ft x 39.37 ft x 12.14 ft (normal load)
67.57 m / 65.00 m x 12.00 m x 3.70 m

Armament:
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 0.55" / 14.0 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1944 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 3 lbs / 1 kg
Shells per gun, main battery: 1,500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.18" / 30 mm 138.62 ft / 42.25 m 13.12 ft / 4.00 m
Ends: 1.18" / 30 mm 32.81 ft / 10.00 m 6.56 ft / 2.00 m
41.83 ft / 12.75 m Unarmoured ends
Main Belt covers 100 % of normal length

- Torpedo Bulkhead:
1.18" / 30 mm 138.62 ft / 42.25 m 13.12 ft / 4.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.20" / 5 mm 0.20" / 5 mm
2nd: 0.20" / 5 mm 0.20" / 5 mm -

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 2,578 shp / 1,923 Kw = 15.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 743 tons

Complement:
146 - 190

Cost:
£0.417 million / $1.666 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 186 tons, 9.5 %
- Belts: 106 tons, 5.4 %
- Torpedo bulkhead: 79 tons, 4.1 %
- Armament: 1 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 66 tons, 3.4 %
Hull, fittings & equipment: 794 tons, 40.7 %
Fuel, ammunition & stores: 455 tons, 23.3 %
Miscellaneous weights: 450 tons, 23.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,829 lbs / 3,098 Kg = 4,418.8 x 1.5 " / 37 mm shells or 2.9 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.5 ft / 0.5 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.670
Length to Beam Ratio: 5.42 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (25 %): 18.04 ft / 5.50 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 15.58 ft / 4.75 m
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 16.65 ft / 5.08 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.7 %
- Above water (accommodation/working, high = better): 134.0 %
Waterplane Area: 6,550 Square feet or 609 Square metres
Displacement factor (Displacement / loading): 253 %
Structure weight / hull surface area: 69 lbs/sq ft or 339 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.24
- Longitudinal: 8.29
- Overall: 1.50
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

Notes:
Not armed in peacetime - armament is designed to be placed on deck and bolted down quickly in wartime.

Ships in Class:
- Gavrila Derzhavin
- Alexander Bestuzhev
- Marina Tsvetaeva
- Nikolay Nekrasov

Yenisei-class, Russian Icebreaker laid down 1946

Displacement:
5,178 t light; 5,363 t standard; 6,897 t normal; 8,124 t full load

Dimensions: Length overall / water x beam x draught
305.31 ft / 295.28 ft x 59.06 ft x 21.33 ft (normal load)
93.06 m / 90.00 m x 18.00 m x 6.50 m

Armament:
3 - 5.12" / 130 mm guns in single mounts, 79.37lbs / 36.00kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount
4 - 0.57" / 14.5 mm guns in single mounts, 0.09lbs / 0.04kg shells, 1946 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 238 lbs / 108 kg
Shells per gun, main battery: 350

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 167.32 ft / 51.00 m 22.97 ft / 7.00 m
Ends: 1.97" / 50 mm 111.52 ft / 33.99 m 22.97 ft / 7.00 m
16.44 ft / 5.01 m Unarmoured ends
Main Belt covers 87 % of normal length

- Torpedo Bulkhead:
1.18" / 30 mm 167.32 ft / 51.00 m 22.97 ft / 7.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.20" / 5 mm 0.98" / 25 mm
2nd: 0.20" / 5 mm 0.20" / 5 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 4,950 shp / 3,692 Kw = 15.00 kts
Range 15,500nm at 15.00 kts
Bunker at max displacement = 2,762 tons

Complement:
377 - 491

Cost:
£1.588 million / $6.351 million

Distribution of weights at normal displacement:
Armament: 30 tons, 0.4 %
Armour: 720 tons, 10.4 %
- Belts: 543 tons, 7.9 %
- Torpedo bulkhead: 168 tons, 2.4 %
- Armament: 10 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 124 tons, 1.8 %
Hull, fittings & equipment: 2,139 tons, 31.0 %
Fuel, ammunition & stores: 1,719 tons, 24.9 %
Miscellaneous weights: 2,165 tons, 31.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,270 lbs / 6,473 Kg = 212.9 x 5.1 " / 130 mm shells or 4.0 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.8 ft / 0.8 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.83

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.649
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (25 %): 16.40 ft / 5.00 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 14.80 ft / 4.51 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68.0 %
- Above water (accommodation/working, high = better): 93.1 %
Waterplane Area: 13,348 Square feet or 1,240 Square metres
Displacement factor (Displacement / loading): 204 %
Structure weight / hull surface area: 109 lbs/sq ft or 530 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.36
- Longitudinal: 3.62
- Overall: 1.50
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Notes:
The ships are armed with single 130mm gun mounts recycled from the old cruisers Rynda and Izumrud.

Ships in Class:
- Yenesei: Laid down 1/1/1946
- Ob: Laid down 7/1/1946
- Irtysh: Laid down 1/1/1947
- Argun: Laid down 7/1/1947

RL-01, Russian Icebreaking Tug laid down 1948

Displacement:
457 t light; 467 t standard; 514 t normal; 552 t full load

Dimensions: Length overall / water x beam x draught
180.34 ft / 174.87 ft x 30.02 ft x 6.23 ft (normal load)
54.97 m / 53.30 m x 9.15 m x 1.90 m

Armament:
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 800

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 174.54 ft / 53.20 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 154 % of normal length

- Torpedo Bulkhead:
0.79" / 20 mm 174.54 ft / 53.20 m 9.84 ft / 3.00 m

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 801 shp / 597 Kw = 13.60 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 85 tons

Complement:
53 - 70

Cost:
£0.140 million / $0.560 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 101 tons, 19.7 %
- Belts: 51 tons, 10.0 %
- Torpedo bulkhead: 50 tons, 9.7 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 20 tons, 3.8 %
Hull, fittings & equipment: 276 tons, 53.6 %
Fuel, ammunition & stores: 57 tons, 11.2 %
Miscellaneous weights: 60 tons, 11.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,350 lbs / 1,973 Kg = 17,822.9 x 0.8 " / 20 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.2 ft / 0.4 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 86 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.95

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.550
Length to Beam Ratio: 5.83 : 1
'Natural speed' for length: 13.22 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (15 %): 18.04 ft / 5.50 m
- Mid (25 %): 14.76 ft / 4.50 m
- Quarterdeck (60 %): 6.56 ft / 2.00 m (14.76 ft / 4.50 m before break)
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 10.50 ft / 3.20 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 80.3 %
- Above water (accommodation/working, high = better): 203.0 %
Waterplane Area: 3,664 Square feet or 340 Square metres
Displacement factor (Displacement / loading): 256 %
Structure weight / hull surface area: 50 lbs/sq ft or 246 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.17
- Longitudinal: 4.44
- Overall: 1.33
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

Breakdown of Miscellaneous Weights:
N/A

Notes:
Designed jointly by Russia and Germany.

Ships in Class:
- RL-01: Laid down in Vladivostok Q1/1948.
- RL-021: Laid down in Vladivostok Q1/1948.