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Coastal Submarines (Podvodnitsa Bregovi)
Delfi-class Coastal Submarines
- BVK Delfi/Dolphin (PB-1) - 1937
- BVK Syomga/Salmon (PB-2) - 1938
- BVK Esetra/Sturgeon (PB-3) - 1938
- BVK Pastarva/Trout (PB-4) - 1938

Uzhilvane-class Coastal Submarines
- BVK Uzhilvane (PB-5) - 1939, acquired 1939
- BVK Kheringa (PB-6) - 1932, acquired 1939
- BVK Chiga (PB-7) - 1932, acquired 1939
- BVK Mryana (PB-8) - 1932, acquired 1939
- BVK Caiman (PB-9) - 1932, acquired 1939

Akula-class Coastal Submarines
- BVK Akula/Shark (PB-10) - 1940
- BVK Zmiorka/Eel (PB-11) - 1940

Oceanic Submarines (Podvodnitsa Okeanski)
- None

Midget Submarines (Podvodnitsa Drebosak)
- PD-1
- PD-2

[SIZE=1]Image by Wes/thesmilingassassin and colored by me.[/SIZE]

Delfi-class, Atlantean-built Bulgarian Coastal Submarine laid down 1937

Displacement:
479 t light; 491 t standard; 537 t normal; 574 t full load

Dimensions: Length overall / water x beam x draught
165.00 ft / 165.00 ft x 22.00 ft x 12.00 ft (normal load)
50.29 m / 50.29 m x 6.71 m x 3.66 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1937 Model
Breech loading gun in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, all aft, all raised mounts - superfiring
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1937 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 15 lbs / 7 kg
Shells per gun, main battery: 150
5 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 1,129 shp / 842 Kw = 15.00 kts
Range 3,000nm at 12.50 kts
Bunker at max displacement = 82 tons

Complement:
55 - 72

Cost:
£0.124 million / $0.495 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 31 tons, 5.8 %
Hull, fittings & equipment: 306 tons, 57.0 %
Fuel, ammunition & stores: 58 tons, 10.8 %
Miscellaneous weights: 140 tons, 26.1 %

Overall survivability and seakeeping ability:[/B]
Survivability (Non-critical penetrating hits needed to sink ship):
187 lbs / 85 Kg = 13.8 x 3.0 " / 76 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.431
Length to Beam Ratio: 7.50 : 1
'Natural speed' for length: 12.85 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 121.1 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,282 Square feet or 212 Square metres
Displacement factor (Displacement / loading): 247 %
Structure weight / hull surface area: 95 lbs/sq ft or 464 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.39
- Longitudinal: 2.55
- Overall: 2.74
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

Performance:
Operational depth: 274 feet
Emergency depth: 438.4 feet
Crush depth: 685 feet

Breakdown of Miscellaneous Weights:
- 105 tons for ballast
- 15 tons for 10 reload torpedo's
- 10 for "improved hydrophones"
- 10 tons for Fallax system

Ships in Class:
- BVK Delfi/Dolphin (PB-1) - 1937
- BVK Syomga/Salmon (PB-2) - 1938
- BVK Esetra/Sturgeon (PB-3) - 1938
- BVK Pastarva/Trout (PB-4) - 1938

Notes:
The Delfi is an updated version of the Atlantean R-74-class coastal submarine.

Image by Wes/thesmilingassassin and colored by me.

Leshtanka, Atlantean-built Bulgarian Midget sub laid down 1937

Displacement:
59 t light; 60 t standard; 61 t normal; 62 t full load

Dimensions: Length overall / water x beam x draught
72.00 ft / 72.00 ft x 8.75 ft x 5.50 ft (normal load)
21.95 m / 21.95 m x 2.67 m x 1.68 m

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 19 shp / 14 Kw = 6.75 kts
Range 1,500nm at 5.00 kts
Bunker at max displacement = 2 tons

Complement:
10 - 14

Cost:
£0.010 million / $0.039 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 1 tons, 0.9 %
Hull, fittings & equipment: 43 tons, 69.4 %
Fuel, ammunition & stores: 2 tons, 3.6 %
Miscellaneous weights: 16 tons, 26.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
94 lbs / 42 Kg = 0.9 x 6 " / 152 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.1 ft / 0.0 m
Roll period: 10.2 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.620
Length to Beam Ratio: 8.23 : 1
'Natural speed' for length: 8.49 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 32.8 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 461 Square feet or 43 Square metres
Displacement factor (Displacement / loading): 358 %
Structure weight / hull surface area: 63 lbs/sq ft or 305 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 5.39
- Longitudinal: 3.44
- Overall: 3.85
Hull space for machinery, storage, compartmentation is excellent

Performance:
Operational depth: 385 feet
Emergency depth: 616 feet
Crush Depth: 962 feet

Breakdown of Miscellaneous Weights:
10 tons for ballast
6 tons for misc weight

Ships in Class:
- PD-1
- PD-2

Uzhilvane-class submarine, Bulgarian Submarine laid down 1932
Ex-Latvian submarines.

Displacement:
300 t light; 310 t standard; 328 t normal; 342 t full load

Dimensions: Length overall / water x beam x draught
141.08 ft / 141.08 ft x 15.75 ft x 11.48 ft (normal load)
43.00 m / 43.00 m x 4.80 m x 3.50 m

Armament:
1 - 2.99" / 76.0 mm guns in single mounts, 15.43lbs / 7.00kg shells, 1932 Model
Quick firing gun in a deck mount with hoist
on centreline forward
1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft gun in deck mounts with hoists
on centreline, all aft
1 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine gun in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 300
4 - 20.9" / 530 mm above water torpedoes, 4 - 20.9" / 530 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 887 shp / 661 Kw = 15.00 kts
Range 2,500nm at 10.00 kts
Bunker at max displacement = 33 tons

Complement:
19 - 25

Cost:
£0.072 million / $0.286 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.6 %
Machinery: 26 tons, 8.0 %
Hull, fittings & equipment: 187 tons, 57.1 %
Fuel, ammunition & stores: 28 tons, 8.4 %
Miscellaneous weights: 85 tons, 25.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
29 lbs / 13 Kg = 2.1 x 3.0 " / 76 mm shells or 0.1 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.450
Length to Beam Ratio: 8.96 : 1
'Natural speed' for length: 11.88 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 241.5 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 1,350 Square feet or 125 Square metres
Displacement factor (Displacement / loading): 215 %
Structure weight / hull surface area: 82 lbs/sq ft or 401 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.31
- Longitudinal: 3.13
- Overall: 3.17
Hull space for machinery, storage, compartmentation is extremely poor
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform

Diving Performance:
Normal Operation Depth: 317 feet
Emergancy Depth: 571 feet
Crush Depth: 793 feet

Ships in Class:
- BVK Uzhilvane (PB-5) - 1939, acquired 1939
- BVK Kheringa (PB-6) - 1932, acquired 1939
- BVK Chiga (PB-7) - 1932, acquired 1939
- BVK Mryana (PB-8) - 1932, acquired 1939
- BVK Caiman (PB-9) - 1932, acquired 1939

Bulgarian Akula-class Submarine

Date 1940
Oceanic
Armament 12x553mm torpedo tubes
ElecHP 2,100
DieselHP 2,800
CREW 31
wt fuel&batts 320t
Light Displacement 615t
Loaded Displacement 793t
Full Displacement 1,055t
res buoyancy 25%
Max Surf Spd 15.3 knots
Max Sub Spd 10 knots

Length: 60.0m
Beam: 6.7m
Draft: 5.3m
Crush depth: 212.5m
#TT 12 x 21" (8 forward, 4 aft)
Mines: 18 tons (12 reload torpedoes simmed as mines)
Tons Oil: 160.0t
Tons Battery: 160.0t
Miscellaneous Weight: 37 tons

Surface Range 7,107@12 knots
Underwater range 54@6 knots

Ships in Class:
- BVK Akula/Shark (PB-10) - 1940
- BVK Zmiorka/Eel (PB-11) - 1940