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Podvodnitsa Lovets - Submarine Chasers
Tsaritsa Ioanna-class Submarine Chaser
- BVK Tsaritsa Ioanna (PL-1)

Knyaginya-class Submarine Chaser
- BVK Knyaginya Evdokiya (PL-02) - 1935
- BVK Knyaginya Nadezhda (PL-03) - 1935

Kanonerska lodka - Gunboats
KL-01-class Patrol Ships
- BVK KL-01: Laid down by KRZ-Flotski Arsenal (Varna), January 1946, completed May 1946
- BVK KL-02: Laid down by Burgas Shipyards Ltd (Burgas), January 1946, completed May 1946
- BVK KL-03: Laid down by Burgas Shipyards Ltd (Burgas), January 1946, completed May 1946

[SIZE=3]Tsaritsa Ioanna, Bulgarian Submarine Chaser laid down 1937[/SIZE]
The ship is composed of two side-by-side subchaser hulls with the following specifications:

Quoted

Displacement:
91 t light; 95 t standard; 109 t normal; 120 t full load

Dimensions: Length overall / water x beam x draught
111.34 ft / 108.27 ft x 13.12 ft x 5.25 ft (normal load)
33.94 m / 33.00 m x 4.00 m x 1.60 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1937 Model
Breech loading gun in deck mount
on centreline forward
Weight of broadside 13 lbs / 6 kg
Shells per gun, main battery: 250

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 901 shp / 672 Kw = 18.00 kts
Range 2,800nm at 12.00 kts
Bunker at max displacement = 25 tons

Complement:
16 - 21

Cost:
£0.044 million / $0.175 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.5 %
Machinery: 25 tons, 23.0 %
Hull, fittings & equipment: 54 tons, 49.9 %
Fuel, ammunition & stores: 18 tons, 16.4 %
Miscellaneous weights: 10 tons, 9.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
183 lbs / 83 Kg = 14.2 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.02
Metacentric height 0.2 ft / 0.1 m
Roll period: 11.0 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.31
Seaboat quality (Average = 1.00): 1.69

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.510
Length to Beam Ratio: 8.25 : 1
'Natural speed' for length: 12.05 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 29
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: 11.48 ft / 3.50 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 8.91 ft / 2.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.1 %
- Above water (accommodation/working, high = better): 101.5 %
Waterplane Area: 994 Square feet or 92 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 18 lbs/sq ft or 90 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 19.81
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The hulls are separated by 4m so total beam is actually 12 meters.

Armament is 1x75mm deck gun and small light weapons.

Original image by thesmilingassassin and modified by me.

[SIZE=3]Knyaginya-class, Bulgarian Submarine Chasers, laid down 1935[/SIZE]
Ex-Azeri Torpedo Gunboats, acquired 1938, rebuilt for treaty compliance 1939.

Displacement:
376 t light; 405 t standard; 422 t normal; 435 t full load

Dimensions: Length overall / water x beam x draught
183.34 ft / 180.45 ft x 26.25 ft x 8.20 ft (normal load)
55.88 m / 55.00 m x 8.00 m x 2.50 m

Armament:
2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1935 Model
Dual purpose guns in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (1x4 guns), 0.24lbs / 0.11kg shells, 1935 Model
Anti-aircraft guns in deck mount
on centreline aft
4 - 0.30" / 7.6 mm guns (2x2 guns), 0.01lbs / 0.00kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 72 lbs / 32 kg
Shells per gun, main battery: 500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm 0.39" / 10 mm -

- Conning tower: 1.18" / 30 mm

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 2,856 shp / 2,131 Kw = 21.00 kts
Range 1,500nm at 12.00 kts
Bunker at max displacement = 30 tons

Complement:
46 - 60

Cost:
£0.163 million / $0.653 million

Distribution of weights at normal displacement:
Armament: 9 tons, 2.1 %
Armour: 5 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 81 tons, 19.2 %
Hull, fittings & equipment: 250 tons, 59.4 %
Fuel, ammunition & stores: 45 tons, 10.8 %
Miscellaneous weights: 31 tons, 7.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
731 lbs / 331 Kg = 20.7 x 4.1 " / 105 mm shells or 0.5 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 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.22

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.380
Length to Beam Ratio: 6.88 : 1
'Natural speed' for length: 16.15 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 47
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 10.37 ft / 3.16 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.9 %
- Above water (accommodation/working, high = better): 122.1 %
Waterplane Area: 2,996 Square feet or 278 Square metres
Displacement factor (Displacement / loading): 156 %
Structure weight / hull surface area: 48 lbs/sq ft or 233 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.14
- Longitudinal: 6.51
- Overall: 1.35
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 4 tons for 18x420lbs depth charges
- 2 tons for K-guns
- 20 tons for mines and rails
- 5 ton for minesweeping paravanes

Ships in Class:
- BVK Knyaginya Evdokiya (PL-02) - 1935
- BVK Knyaginya Nadezhda (PL-03) - 1935

KL-01, Bulgarian Patrol Ship laid down 1946

Displacement:
250 t light; 262 t standard; 325 t normal; 375 t full load

Dimensions: Length overall / water x beam x draught
180.45 ft / 180.45 ft x 19.69 ft x 7.71 ft (normal load)
55.00 m / 55.00 m x 6.00 m x 2.35 m

Armament:
1 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1946 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1946 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 26 lbs / 12 kg
Shells per gun, main battery: 350

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, 2,415 shp / 1,802 Kw = 20.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 113 tons

Complement:
37 - 49

Cost:
£0.141 million / $0.564 million

Distribution of weights at normal displacement:
Armament: 3 tons, 1.0 %
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: 60 tons, 18.6 %
Hull, fittings & equipment: 138 tons, 42.6 %
Fuel, ammunition & stores: 75 tons, 23.0 %
Miscellaneous weights: 45 tons, 13.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
558 lbs / 253 Kg = 26.9 x 3.5 " / 88 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.13
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.415
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 13.43 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 14.07 ft / 4.29 m
- Forecastle (20 %): 8.96 ft / 2.73 m
- Mid (50 %): 8.96 ft / 2.73 m
- Quarterdeck (15 %): 8.96 ft / 2.73 m
- Stern: 8.96 ft / 2.73 m
- Average freeboard: 9.37 ft / 2.85 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.7 %
- Above water (accommodation/working, high = better): 101.8 %
Waterplane Area: 2,207 Square feet or 205 Square metres
Displacement factor (Displacement / loading): 167 %
Structure weight / hull surface area: 29 lbs/sq ft or 139 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 4.94
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weights:
- 15 tons for electronics systems (radar, sonar)
- 25 tons for ASW gear
- 5 tons for minesweeping paravane

Ships in Class:
- BVK KL-01: Laid down by KRZ-Flotski Arsenal (Varna), January 1946, completed May 1946
- BVK KL-02: Laid down by Burgas Shipyards Ltd (Burgas), January 1946, completed May 1946
- BVK KL-03: Laid down by Burgas Shipyards Ltd (Burgas), January 1946, completed May 1946