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Karnobat, Bulgarian Minesweeper laid down 1935

Displacement:
430 t light; 442 t standard; 499 t normal; 544 t full load

Dimensions: Length overall / water x beam x draught
192.75 ft / 189.00 ft x 27.00 ft x 9.00 ft (normal load)
58.75 m / 57.61 m x 8.23 m x 2.74 m

Armament:
2 - 2.99" / 76.0 mm guns (1x2 guns), 13.39lbs / 6.08kg shells, 1935 Model
Dual purpose guns in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1935 Model
Quick firing guns in deck mounts
on side, all amidships
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1935 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -
2nd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,098 shp / 819 Kw = 16.00 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 101 tons

Complement:
52 - 68

Cost:
£0.115 million / $0.461 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.8 %
Armour: 5 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 31 tons, 6.3 %
Hull, fittings & equipment: 209 tons, 42.0 %
Fuel, ammunition & stores: 69 tons, 13.9 %
Miscellaneous weights: 180 tons, 36.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,104 lbs / 501 Kg = 82.4 x 3.0 " / 76 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.380
Length to Beam Ratio: 7.00 : 1
'Natural speed' for length: 16.50 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 14.00 ft / 4.27 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 10.00 ft / 3.05 m
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 10.32 ft / 3.15 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.4 %
- Above water (accommodation/working, high = better): 118.2 %
Waterplane Area: 3,228 Square feet or 300 Square metres
Displacement factor (Displacement / loading): 179 %
Structure weight / hull surface area: 37 lbs/sq ft or 183 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 4.34
- Overall: 1.09
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