Image originally by Wes/Thesmilingassassin and modified heavily by me.
Kyustendil-class, Bulgarian Contradestroyer laid down 1937
Displacement:
2,439 t light; 2,593 t standard; 2,895 t normal; 3,136 t full load
Dimensions: Length overall / water x beam x draught
459.31 ft / 442.91 ft x 41.01 ft x 13.94 ft (normal load)
140.00 m / 135.00 m x 12.50 m x 4.25 m
Armament:
8 - 5.12" / 130 mm guns (4x2 guns), 67.03lbs / 30.40kg shells, 1937 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (2x4 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 562 lbs / 255 kg
Shells per gun, main battery: 300
12 - 25.6" / 650 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.38" / 35 mm 0.98" / 25 mm 1.38" / 35 mm
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -
4th: 0.39" / 10 mm 0.39" / 10 mm -
- Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 51,147 shp / 38,156 Kw = 35.00 kts
Range 12,820nm at 10.00 kts
Range 5,500nm at 15.00 kts
Range 2,840nm at 20.00 kts
Range 1,610nm at 25.00 kts
Range 975nm at 30.00 kts
Range 620nm at 35.00 kts
Bunker at max displacement = 544 tons
Complement:
196 - 256
Cost:
£1.831 million / $7.323 million
Distribution of weights at normal displacement:
Armament: 83 tons, 2.9 %
Armour: 55 tons, 1.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 41 tons, 1.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 14 tons, 0.5 %
Machinery: 1,290 tons, 44.6 %
Hull, fittings & equipment: 942 tons, 32.5 %
Fuel, ammunition & stores: 455 tons, 15.7 %
Miscellaneous weights: 70 tons, 2.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
868 lbs / 393 Kg = 12.9 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.7 ft / 0.5 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.14
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.80 : 1
'Natural speed' for length: 24.19 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 61
Bow angle (Positive = bow angles forward): 27.75 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.05 ft / 8.55 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (40 %): 21.00 ft / 6.40 m (14.01 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.01 ft / 4.27 m
- Stern: 14.01 ft / 4.27 m
- Average freeboard: 17.37 ft / 5.29 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 169.9 %
- Above water (accommodation/working, high = better): 59.0 %
Waterplane Area: 11,604 Square feet or 1,078 Square metres
Displacement factor (Displacement / loading): 80 %
Structure weight / hull surface area: 43 lbs/sq ft or 211 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 1.55
- Overall: 0.57
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
* * * * *
Kyustendil class, Bulgarian Contradestroyer laid down 1937
As refitted 1943.
Displacement:
2,438 t light; 2,593 t standard; 2,895 t normal; 3,136 t full load
Dimensions: Length overall / water x beam x draught
457.67 ft / 442.91 ft x 41.01 ft x 13.94 ft (normal load)
139.50 m / 135.00 m x 12.50 m x 4.25 m
Armament:
8 - 5.12" / 130 mm guns (4x2 guns), 67.03lbs / 30.40kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
8 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 562 lbs / 255 kg
Shells per gun, main battery: 300
12 - 25.6" / 650 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.38" / 35 mm 0.98" / 25 mm 1.38" / 35 mm
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -
4th: 0.39" / 10 mm 0.39" / 10 mm -
- Conning tower: 3.15" / 80 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 51,147 shp / 38,156 Kw = 35.00 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 544 tons
Complement:
196 - 256
Cost:
£1.830 million / $7.321 million
Distribution of weights at normal displacement:
Armament: 84 tons, 2.9 %
Armour: 57 tons, 2.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 44 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 14 tons, 0.5 %
Machinery: 1,285 tons, 44.4 %
Hull, fittings & equipment: 922 tons, 31.8 %
Fuel, ammunition & stores: 456 tons, 15.8 %
Miscellaneous weights: 90 tons, 3.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
844 lbs / 383 Kg = 12.6 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.15
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.80 : 1
'Natural speed' for length: 24.19 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 61
Bow angle (Positive = bow angles forward): 27.75 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.05 ft / 8.55 m
- Forecastle (20 %): 21.33 ft / 6.50 m
- Mid (40 %): 21.00 ft / 6.40 m (14.01 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.01 ft / 4.27 m
- Stern: 14.01 ft / 4.27 m
- Average freeboard: 17.44 ft / 5.32 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 170.4 %
- Above water (accommodation/working, high = better): 59.2 %
Waterplane Area: 11,604 Square feet or 1,078 Square metres
Displacement factor (Displacement / loading): 79 %
Structure weight / hull surface area: 42 lbs/sq ft or 205 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.54
- Overall: 0.56
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
Breakdown of Miscellaneous Weights:
- 30 tons for torpedo reloads
- 45 tons for assorted electronic gear
- 5 tons for depth charges (24x420-lb bombs)
- 10 tons extra gear for guns
Ships in Class:
- BVK
Kyustendil (KR1) -
Completed March, 1938.
- BVK
Pazardzhik (KR2) -
Completed December, 1938.
- BVK
Kazanlak (KR3) -
Completed March 1941
- BVK
Veliko Tarnovo (KR4) -
Completed June 1942
Notes and Comments:
130mm DP guns simmed as automatics to permit more weight for advanced shell-handling equipment.
The
Kyustendil-class contradestroyers were one of the first warships designed in Bulgaria. Although designed like a regular destroyer, the contradestroyers have a focus on independent offensive surface action. The Bulgarian designers were substantially influenced by the Bharati Naval Service's concept of "Daakuui" and drew up the
Kyustendil-class as their own interpretation of the concept.
Tactically, the contradestroyers are intended to be used in independent flotillas to engage surface targets with torpedoes. The ships are therefore equipped with massive 65cm Russian-designed Pattern 36/65 torpedoes, capable of inflicting heavy damage with a single hit. Guns are intended for use only after torpedoes have been used, in order to finish off damaged or crippled opponents; the main battery is also intended to provide excellent anti-aircraft coverage. In order to improve the rate of fire, ammunition hoists were added.
In 1943, French teledetection equipment was purchased and the four ships were refitted to carry it. The depth charge load was reduced to twenty-four charges in order to free up some topweight.