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Kashin class Submarine Chaser, laid down 1916
Length, 35.0 m x Beam, 5.0 m x Depth, 1.4 m
136 tonnes normal displacement (119 tonnes standard)
Main battery: 1 x 5.7-cm
Secondary battery: 2 x 3.7-cm
AA battery: 2 x 0.8-cm
Weight of broadside: 4 kg
25 tons depth charges/cargo

Hull unarmored
Conning tower, 2.5 cm
Battery armor:
Main, 2.5 cm shields / secondary, 2.5 cm shields
Maximum speed for 583 shaft kw = 16.00 knots
Approximate cruising radius, 2300 nm / 10 knots
Typical complement: 20-26

Estimated cost, $62,000 (£15,000)

Remarks:
Ship has slow, easy roll; a good, steady gun platform.
Excellent seaboat; comfortable and able to fight her guns in the heaviest weather.

Distribution of weights:
Percent normal displacement:
Armament ......................... 1 tonnes = 1 pct
Armor, total ..................... 2 tonnes = 1 pct
C.T. 1 tonnes = 0 pct
Armament 1 tonnes = 1 pct
Machinery ........................ 32 tonnes = 24 pct
Hull and fittings; equipment ..... 55 tonnes = 41 pct
Fuel, ammunition, stores ......... 21 tonnes = 15 pct
Miscellaneous weights ............ 25 tonnes = 18 pct

-----

136 tonnes = 100 pct
Estimated metacentric height, 0.1 m
Displacement summary:
Light ship: 115 tonnes
Standard displacement: 119 tonnes
Normal service: 136 tonnes
Full load: 149 tonnes
Loading submergence 118 tonnes/metre

+++++++++++++++++++++++++

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.04
Shellfire needed to sink: 94 kg = 36.7 x 5.7-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 0.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.12
Relative quality as a seaboat: 1.51

+++++++++++++++++++++++++

Hull form characteristics:
Block coefficient: 0.55
Sharpness coefficient: 0.39
Hull speed coefficient 'M' = 6.82
'Natural speed' for length = 10.7 knots
Power going to wave formation
at top speed: 66 percent

Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 103 percent
Relative accommodation and working space: 99 percent

Displacement factor: 136 percent
(Displacement relative to loading factors)

Relative cross-sectional hull strength: 0.89
(Structure weight per square
metre of hull surface: 120 kg)
Relative longitudinal hull strength: 4.20
(for 2.50 m average freeboard;
freeboard adjustment +0.55 m)
Relative composite hull strength: 1.04

+++++++++++++++++++++++++

[Machine-readable parameters: Spring Style v. 1.2.1]
114.80 x 16.40 x 4.59; 8.20 -- Dimensions
0.55 -- Block coefficient
1916 -- Year laid down
16.00 / 2300 / 10.00; Turbine, coal fired -- Speed / radius / cruise
25 tons -- Miscellaneous weights

++++++++++

1 x 2.24; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.46; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 0.31 -- Tertiary (QF/AA) battery
:
0 -- No fourth (light) battery
0 -- No torpedo armament

++++++++++

0.00 -- No belt armor
0.00 / 0.98 -- Deck / CT
0.98 / 0.98 / 0.00 / 0.00 -- Battery armor

(Note: For portability, values are stored in Anglo-American units)

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Project 03 Lilya Class Corvette, laid down 1920
Length, 65.0 m x Beam, 6.5 m x Depth, 2.6 m
443 tonnes normal displacement (384 tonnes standard)
Main battery: 2 x 10.0-cm
Secondary battery: 4 x 3.7-cm
Light battery: 4 x 1.3-cm
Weight of broadside: 31 kg
4 TT, 53.0 cm
25 tons depth charges/mines
Hull unarmored
Maximum speed for 8114 shaft kw = 28.00 knots
Approximate cruising radius, 4300 nm / 12 knots
Typical complement: 48-63

Estimated cost, $472,000 (£118,000)
Remarks:
Caution: Hull structure is subject to strain in open-sea
conditions.
Caution: Very cramped ship with excessively poor habitability;
lacks suitable working space.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Distribution of weights:
Percent
normal
displacement:
Armament ......................... 8 tonnes = 2 pct
Machinery ........................ 214 tonnes = 48 pct
Hull and fittings; equipment ..... 123 tonnes = 28 pct
Fuel, ammunition, stores ......... 73 tonnes = 17 pct
Miscellaneous weights ............ 25 tonnes = 6 pct
-----
443 tonnes = 100 pct
Estimated metacentric height, 0.2 m
Displacement summary:
Light ship: 370 tonnes
Standard displacement: 384 tonnes
Normal service: 443 tonnes
Full load: 488 tonnes
Loading submergence 231 tonnes/metre
+++++++++++++++++++++++++

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.08
Shellfire needed to sink: 51 kg = 3.7 x 10.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.37
Relative quality as a seaboat: 1.22
+++++++++++++++++++++++++

Hull form characteristics:
Block coefficient: 0.40
Sharpness coefficient: 0.30
Hull speed coefficient 'M' = 8.54
'Natural speed' for length = 14.6 knots
Power going to wave formation
at top speed: 69 percent

Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 176 percent
Relative accommodation and working space: 45 percent

Displacement factor: 52 percent
(Displacement relative to loading factors)

Relative cross-sectional hull strength: 0.46
(Structure weight per square
metre of hull surface: 109 kg)
Relative longitudinal hull strength: 2.00
(for 3.55 m average freeboard;
freeboard adjustment +1.07 m)
Relative composite hull strength: 0.53
+++++++++++++++++++++++++

[Machine-readable parameters: Spring Style v. 1.2.1]
213.20 x 21.32 x 8.53; 11.64 -- Dimensions
0.40 -- Block coefficient
1920 -- Year laid down
28.00 / 4300 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
25 tons -- Miscellaneous weights
++++++++++
2 x 3.94; 0 -- Main battery; turrets
Central positioning of guns
:
4 x 1.46; 0 -- Secondary battery; turrets
:
0 -- No tertiary (QF/AA) battery
4 x 0.51 -- Fourth (light) battery
4 / 0 / 20.87 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor

(Note: For portability, values are stored in Anglo-American units)

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Project 09 Roza class corvettes, laid down 1923

Length, 70.0 m x Beam, 7.0 m x Depth, 3.0 m
667 tonnes normal displacement (610 tonnes standard)

Main battery: 3 x 10.0-cm
AA battery: 2 x 3.7-cm
Light battery: 4 x 1.3-cm

Weight of broadside: 43 kg

4 TT, 53.0 cm in a single quadruple mount

15 tons depth charges/mines

Hull unarmored

Battery armor:
Main, 2.5 cm shields
AA, 2.5 cm shields

Maximum speed for 16312 shaft kw = 31.00 knots
Approximate cruising radius, 3400 nm / 12 knots

Typical complement: 66-85


Estimated cost, $921,000 (£230,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 12 tonnes = 2 pct
Armor, total ..................... 4 tonnes = 1 pct

Armament 4 tonnes = 1 pct

Machinery ........................ 347 tonnes = 52 pct
Hull and fittings; equipment ..... 211 tonnes = 32 pct
Fuel, ammunition, stores ......... 78 tonnes = 12 pct
Miscellaneous weights ............ 15 tonnes = 2 pct
-----
667 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 589 tonnes
Standard displacement: 610 tonnes
Normal service: 667 tonnes
Full load: 710 tonnes

Loading submergence 289 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.08

Shellfire needed to sink: 82 kg = 5.9 x 10.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.47

Relative quality as a seaboat: 1.21

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.03
'Natural speed' for length = 15.2 knots
Power going to wave formation
at top speed: 74 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 184 percent

Relative accommodation and working space: 92 percent


Displacement factor: 42 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 143 kg)

Relative longitudinal hull strength: 2.94
(for 4.57 m average freeboard;
freeboard adjustment +1.89 m)

Relative composite hull strength: 0.59

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

229.60 x 22.96 x 9.84; 15.00 -- Dimensions
0.45 -- Block coefficient
1923 -- Year laid down
31.00 / 3400 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
15 tons -- Miscellaneous weights
++++++++++
3 x 3.94; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
2 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
4 / 0 / 20.87 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
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)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Project 17 Myak (Poppy) class, Russian Corvette laid down 1925

Displacement:
515 t light; 541 t standard; 597 t normal; 642 t full load

Dimensions: Length overall / water x beam x draught
268.71 ft / 229.66 ft x 21.33 ft x 10.66 ft (normal load)
81.90 m / 70.00 m x 6.50 m x 3.25 m

Armament:
3 - 3.94" / 100 mm guns in single mounts, 37.48lbs / 17.00kg shells, 1925 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 119 lbs / 54 kg
Shells per gun, main battery: 200
4 - 20.9" / 530 mm above water torpedoes
10 tons depth charges

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

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 16,004 shp / 11,939 Kw = 31.00 kts
Range 3,800nm at 12.00 kts (Bunkerage = 101 tons)

Complement:
59 - 78

Cost:
£0.226 million / $0.903 million

Distribution of weights at normal displacement:
Armament: 12 tons, 2.0 %
Armour: 7 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 291 tons, 48.7 %
Hull, fittings & equipment: 195 tons, 32.7 %
Fuel, ammunition & stores: 82 tons, 13.7 %
Miscellaneous weights: 10 tons, 1.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
164 lbs / 75 Kg = 5.4 x 3.9 " / 100 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.77 : 1
'Natural speed' for length: 17.42 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 32.81 ft / 10.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.16 ft / 5.23 m
- Forecastle (20 %): 17.16 ft / 5.23 m (10.33 ft / 3.15 m aft of break)
- Mid (50 %): 10.33 ft / 3.15 m
- Quarterdeck (15 %): 10.33 ft / 3.15 m
- Stern: 10.33 ft / 3.15 m
- Average freeboard: 11.70 ft / 3.57 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 175.8 %
- Above water (accommodation/working, high = better): 46.4 %
Waterplane Area: 3,129 Square feet or 291 Square metres
Displacement factor (Displacement / loading): 52 %
Structure weight / hull surface area: 24 lbs/sq ft or 118 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 4.66
- Overall: 0.62
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor

Project 16U "Geran" (aka "P-27"), Russian Patrol Ship laid down 1927

Displacement:
270 t light; 283 t standard; 333 t normal; 373 t full load

Dimensions: Length overall / water x beam x draught
154.20 ft / 154.20 ft x 25.59 ft x 5.91 ft (normal load)
47.00 m / 47.00 m x 7.80 m x 1.80 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 37.48lbs / 17.00kg shells, 1927 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1927 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 81 lbs / 37 kg
Shells per gun, main battery: 150

Armour:
- 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 - -

- Conning tower: 1.18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,934 shp / 1,443 Kw = 18.00 kts
Range 4,300nm at 12.00 kts (Bunkerage = 89 tons)

Complement:
38 - 50

Cost:
£0.091 million / $0.364 million

Distribution of weights at normal displacement:
Armament: 8 tons, 2.5 %
Armour: 5 tons, 1.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 1.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.4 %
Machinery: 61 tons, 18.3 %
Hull, fittings & equipment: 145 tons, 43.4 %
Fuel, ammunition & stores: 63 tons, 19.0 %
Miscellaneous weights: 50 tons, 15.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
573 lbs / 260 Kg = 18.8 x 3.9 " / 100 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.22
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 6.03 : 1
'Natural speed' for length: 12.42 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 58
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: 17.55 ft / 5.35 m
- Forecastle (20 %): 13.12 ft / 4.00 m
- Mid (50 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m aft of break)
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 10.20 ft / 3.11 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.1 %
- Above water (accommodation/working, high = better): 126.4 %
Waterplane Area: 2,629 Square feet or 244 Square metres
Displacement factor (Displacement / loading): 136 %
Structure weight / hull surface area: 33 lbs/sq ft or 160 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.09
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Ships in Class:
- 20 ships

AS-27-class, Russian wooden subchaser laid down 1927

Displacement:
100 t light; 103 t standard; 115 t normal; 124 t full load

Dimensions: Length overall / water x beam x draught
111.55 ft / 111.55 ft x 16.90 ft x 4.27 ft (normal load)
34.00 m / 34.00 m x 5.15 m x 1.30 m

Armament:
1 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1927 Model
Breech loading gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
Breech loading guns in deck mount
on centreline aft
Weight of broadside 9 lbs / 4 kg
Shells per gun, main battery: 150
25 tons depth charges/mines

Armour:
- 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 -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 701 shp / 523 Kw = 16.00 kts
Range 3,000nm at 10.00 kts (Bunkerage = 21 tons)

Complement:
16 - 22

Cost:
£0.027 million / $0.109 million

Distribution of weights at normal displacement:
Armament: 1 tons, 1.0 %
Armour: 1 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 22 tons, 19.3 %
Hull, fittings & equipment: 50 tons, 43.6 %
Fuel, ammunition & stores: 15 tons, 13.2 %
Miscellaneous weights: 25 tons, 21.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
214 lbs / 97 Kg = 37.8 x 2.2 " / 57 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.4 ft / 0.1 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.27

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 6.60 : 1
'Natural speed' for length: 10.56 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 9.84 ft / 3.00 m
- Forecastle (20 %): 8.20 ft / 2.50 m
- Mid (50 %): 7.55 ft / 2.30 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 7.59 ft / 2.31 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.1 %
- Above water (accommodation/working, high = better): 111.1 %
Waterplane Area: 1,256 Square feet or 117 Square metres
Displacement factor (Displacement / loading): 145 %
Structure weight / hull surface area: 21 lbs/sq ft or 104 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 6.16
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Ships in Class:
40 ships built over the course of production

Project 37 "Orchidia" class, Russian Corvette laid down 1931

Displacement:
577 t light; 598 t standard; 689 t normal; 761 t full load

Dimensions: Length overall / water x beam x draught
229.66 ft / 229.66 ft x 21.33 ft x 12.30 ft (normal load)
70.00 m / 70.00 m x 6.50 m x 3.75 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 37.48lbs / 17.00kg shells, 1931 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (1x4 guns), 1.55lbs / 0.70kg shells, 1931 Model
Anti-aircraft guns in a deck mount with hoist
on centreline aft, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1931 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 81 lbs / 37 kg
Shells per gun, main battery: 150
3 - 20.9" / 530 mm above water torpedoes

Armour:
- 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 -

- Conning tower: 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 15,347 shp / 11,449 Kw = 30.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 163 tons

Complement:
66 - 87

Cost:
£0.322 million / $1.289 million

Distribution of weights at normal displacement:
Armament: 8 tons, 1.2 %
Armour: 5 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 333 tons, 48.3 %
Hull, fittings & equipment: 221 tons, 32.1 %
Fuel, ammunition & stores: 111 tons, 16.2 %
Miscellaneous weights: 10 tons, 1.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
212 lbs / 96 Kg = 7.0 x 3.9 " / 100 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.29

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.77 : 1
'Natural speed' for length: 17.42 kts
Power going to wave formation at top speed: 70 %
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: 22.31 ft / 6.80 m
- Forecastle (20 %): 14.11 ft / 4.30 m
- Mid (50 %): 14.11 ft / 4.30 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 10.83 ft / 3.30 m
- Average freeboard: 12.71 ft / 3.87 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 167.2 %
- Above water (accommodation/working, high = better): 62.2 %
Waterplane Area: 3,129 Square feet or 291 Square metres
Displacement factor (Displacement / loading): 69 %
Structure weight / hull surface area: 24 lbs/sq ft or 119 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 6.26
- Overall: 0.64
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
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight:
10 tons depth charges

AS-33 class subchaser

Project 61 "Gostinitsa" class, Russian Patrul'ny Storozhevoy Kater (Coastguard Patrol Cutter) laid down 1941

Displacement:
222 t light; 231 t standard; 285 t normal; 327 t full load

Dimensions: Length overall / water x beam x draught
173.51 ft / 164.04 ft x 19.69 ft x 7.71 ft (normal load)
52.89 m / 50.00 m x 6.00 m x 2.35 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 15.43lbs / 7.00kg shells, 1941 Model
Dual purpose gun in a deck mount with hoist
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in a deck mount with hoist
on centreline aft
8 - 0.55" / 14.0 mm guns (4x2 guns), 0.08lbs / 0.04kg shells, 1941 Model
Breech loading guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 19 lbs / 9 kg
Shells per gun, main battery: 300

Armour:
- 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 -

- Conning tower: 1.18" / 30 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,518 shp / 1,132 Kw = 18.00 kts
Range 6,300nm at 12.00 kts
Bunker at max displacement = 96 tons

Complement:
34 - 45

Cost:
£0.094 million / $0.375 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.8 %
Armour: 3 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.4 %
Machinery: 40 tons, 14.1 %
Hull, fittings & equipment: 142 tons, 49.8 %
Fuel, ammunition & stores: 63 tons, 22.1 %
Miscellaneous weights: 35 tons, 12.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
670 lbs / 304 Kg = 49.6 x 3.0 " / 76 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.22
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.400
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 12.81 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (20 %): 10.17 ft / 3.10 m
- Mid (50 %): 10.17 ft / 3.10 m
- Quarterdeck (15 %): 10.17 ft / 3.10 m
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 10.77 ft / 3.28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.8 %
- Above water (accommodation/working, high = better): 113.3 %
Waterplane Area: 1,988 Square feet or 185 Square metres
Displacement factor (Displacement / loading): 210 %
Structure weight / hull surface area: 28 lbs/sq ft or 138 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.77
- Longitudinal: 9.99
- Overall: 1.00
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

Breakdown of Miscellaneous Weights:
- 5 tons for electronics
- 20 tons for mines or depth charges
- 5 tons for climatization gear
- 5 tons for minesweeping paravanes

Electronics Suite:
- NR-119 navigational and air-warning radar (1 radar, 2.5 tons)
- Antisubmarine Hydrophones (1 sonar, 2.5 tons)

Ships in Class:
PSKR-01: Laid down January 1st, 1941
PSKR-02: Laid down January 1st, 1941
PSKR-03: Laid down January 1st, 1941
PSKR-04: Laid down January 1st, 1941
PSKR-05: Laid down January 1st, 1941
PSKR-06: Laid down September 1st, 1941
PSKR-07: Laid down September 1st, 1941
PSKR-08: Laid down September 1st, 1941
PSKR-09: Laid down September 1st, 1941
PSKR-10: Laid down September 1st, 1941
PSKR-11: Laid down January 1st, 1943
PSKR-12: Laid down January 1st, 1943
PSKR-13: Laid down January 1st, 1943
PSKR-14: Laid down January 1st, 1943
PSKR-15: Laid down January 1st, 1943
PSKR-16: Laid down January 1st, 1943
PSKR-17: Laid down January 1st, 1943
PSKR-18: Laid down January 1st, 1943
PSKR-19: Laid down January 1st, 1943
PSKR-20: Laid down January 1st, 1943
PSKR-21: Laid down March 1st, 1943
PSKR-22: Laid down March 1st, 1943
PSKR-23: Laid down March 1st, 1943
PSKR-24: Laid down March 1st, 1943
PSKR-25: Laid down March 1st, 1943
PSKR-26: Laid down March 1st, 1943
PSKR-27: Laid down March 1st, 1943
PSKR-28: Laid down March 1st, 1943
PSKR-29: Laid down March 1st, 1943
PSKR-30: Laid down March 1st, 1943
PSKR-31: Laid down July 1st, 1943
PSKR-32: Laid down July 1st, 1943
PSKR-33: Laid down July 1st, 1943
PSKR-34: Laid down July 1st, 1943
PSKR-35: Laid down July 1st, 1943
PSKR-36: Laid down July 1st, 1943
PSKR-37: Laid down July 1st, 1943
PSKR-38: Laid down July 1st, 1943
PSKR-39: Laid down July 1st, 1943
PSKR-40: Laid down July 1st, 1943
PSKR-41: Laid down January 1st, 1944
PSKR-42: Laid down January 1st, 1944
PSKR-43: Laid down January 1st, 1944
PSKR-44: Laid down January 1st, 1944
PSKR-45: Laid down January 1st, 1944
PSKR-46: Laid down January 1st, 1944
PSKR-47: Laid down January 1st, 1944
PSKR-48: Laid down January 1st, 1944
PSKR-49: Laid down January 1st, 1944
PSKR-50: Laid down January 1st, 1944
PSKR-51: Laid down July 1st, 1944
PSKR-52: Laid down July 1st, 1944
PSKR-53: Laid down July 1st, 1944
PSKR-54: Laid down July 1st, 1944
PSKR-55: Laid down July 1st, 1944
PSKR-56: Laid down July 1st, 1944
PSKR-57: Laid down July 1st, 1944
PSKR-58: Laid down July 1st, 1944
PSKR-59: Laid down July 1st, 1944
PSKR-60: Laid down July 1st, 1944
PSKR-61: Laid down January 1st, 1945
PSKR-62: Laid down January 1st, 1945
PSKR-63: Laid down January 1st, 1945
PSKR-64: Laid down January 1st, 1945
PSKR-65: Laid down January 1st, 1945
PSKR-66: Laid down January 1st, 1945
PSKR-67: Laid down January 1st, 1945
PSKR-68: Laid down January 1st, 1945
PSKR-69: Laid down January 1st, 1945
PSKR-70: Laid down January 1st, 1945
PSKR-71: Laid down July 1st, 1945
PSKR-72: Laid down July 1st, 1945
PSKR-73: Laid down July 1st, 1945
PSKR-74: Laid down July 1st, 1945
PSKR-75: Laid down July 1st, 1945
PSKR-76: Laid down July 1st, 1945
PSKR-77: Laid down July 1st, 1945
PSKR-78: Laid down July 1st, 1945
PSKR-79: Laid down July 1st, 1945
PSKR-80: Laid down July 1st, 1945
PSKR-81: Laid down January 1st, 1946
PSKR-82: Laid down January 1st, 1946
PSKR-83: Laid down January 1st, 1946
PSKR-84: Laid down January 1st, 1946
PSKR-85: Laid down January 1st, 1946
PSKR-86: Laid down January 1st, 1946
PSKR-87: Laid down January 1st, 1946
PSKR-88: Laid down January 1st, 1946
PSKR-89: Laid down January 1st, 1946
PSKR-90: Laid down January 1st, 1946
PSKR-91: Laid down July 1st, 1946
PSKR-92: Laid down July 1st, 1946
PSKR-93: Laid down July 1st, 1946
PSKR-94: Laid down July 1st, 1946
PSKR-95: Laid down July 1st, 1946
PSKR-96: Laid down July 1st, 1946
PSKR-97: Laid down July 1st, 1946
PSKR-98: Laid down July 1st, 1946
PSKR-99: Laid down July 1st, 1946
PSKR-100: Laid down July 1st, 1946

Project 83 Avantyurin, Russian Small Antisubmarine Ship laid down 1947
The Project 83 Avantyurin small antisubmarine ships were built as part of a program of replacements for outdated light escorts. The Project 83 design was also used for the Project 83M Makhachkala coastguard patrol ship, which exchanged much of its antisubmarine capability for the ability to carry two light inspection boats.

Displacement:
600 t light; 626 t standard; 780 t normal; 903 t full load

Dimensions: Length overall / water x beam x draught
234.32 ft / 229.66 ft x 27.56 ft x 10.01 ft (normal load)
71.42 m / 70.00 m x 8.40 m x 3.05 m

Armament:
2 - 2.95" / 75.0 mm guns in single mounts, 15.43lbs / 7.00kg shells, 1947 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1947 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships
4 - 0.55" / 14.0 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1947 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 450

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.20" / 5 mm 0.20" / 5 mm
2nd: 0.59" / 15 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 9,319 shp / 6,952 Kw = 26.00 kts
Range 4,250nm at 18.00 kts
Bunker at max displacement = 277 tons

Complement:
73 - 95

Cost:
£0.416 million / $1.662 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.6 %
Armour: 4 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 230 tons, 29.5 %
Hull, fittings & equipment: 211 tons, 27.1 %
Fuel, ammunition & stores: 180 tons, 23.1 %
Miscellaneous weights: 150 tons, 19.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
473 lbs / 215 Kg = 36.7 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.13
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.431
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 17.72 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.39 ft / 5.30 m
- Forecastle (25 %): 16.40 ft / 5.00 m
- Mid (50 %): 15.42 ft / 4.70 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.37 ft / 2.55 m
- Stern: 8.53 ft / 2.60 m
- Average freeboard: 12.34 ft / 3.76 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 122.3 %
- Above water (accommodation/working, high = better): 123.5 %
Waterplane Area: 4,130 Square feet or 384 Square metres
Displacement factor (Displacement / loading): 120 %
Structure weight / hull surface area: 26 lbs/sq ft or 126 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.53
- Longitudinal: 3.02
- Overall: 0.63
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Breakdown of Miscellaneous Weights:
As Small Antisubmarine Ship

As Coastguard Patrol Ship

Ships in Class:
- MPK-171: Laid down Q3/1947 in Petrograd.
- MPK-172: Laid down Q3/1947 in Petrograd.
- MPK-173: Laid down Q3/1947 in Petrograd.
- MPK-174: Laid down Q3/1947 in Petrograd.
- MPK-175: Laid down Q3/1947 in Petrograd.
- MPK-176: Laid down Q1/1948 in Petrograd.
- MPK-177: Laid down Q1/1948 in Petrograd.
- MPK-178: Laid down Q1/1948 in Petrograd.
- MPK-179: Laid down Q1/1948 in Petrograd.
- MPK-180: Laid down Q1/1948 in Petrograd.

Makhachkala-class Coastguard Patrol Ship ("Patrul'ny Storozhevoy Korabl'")
- Makhachkala: Laid down Q1/1948 in Petrograd.
- Derbent: Laid down Q1/1948 in Petrograd.
- Kaspiysk: Laid down Q1/1948 in Petrograd.
- Guriev: Laid down Q1/1948 in Petrograd.
- Krasnovodsk: Laid down Q1/1948 in Petrograd.