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Salzata, Bulgarian Subchaser laid down 1936

Displacement:
269 t light; 277 t standard; 357 t normal; 422 t full load

Dimensions: Length overall / water x beam x draught
174.75 ft / 174.75 ft x 23.00 ft x 7.50 ft (normal load)
53.26 m / 53.26 m x 7.01 m x 2.29 m

Armament:
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1936 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships
3 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 28 lbs / 13 kg
Shells per gun, main battery: 100

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm - -
2nd: 0.25" / 6 mm - -
3rd: 0.25" / 6 mm - -

- Conning tower: 0.50" / 13 mm

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 2,200 shp / 1,641 Kw = 20.00 kts
Range 6,000nm at 14.00 kts
Bunker at max displacement = 144 tons

Complement:
40 - 53

Cost:
£0.110 million / $0.442 million

Distribution of weights at normal displacement:
Armament: 3 tons, 1.0 %
Armour: 2 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 62 tons, 17.3 %
Hull, fittings & equipment: 147 tons, 41.2 %
Fuel, ammunition & stores: 89 tons, 24.9 %
Miscellaneous weights: 54 tons, 15.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
681 lbs / 309 Kg = 50.5 x 3.0 " / 76 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.42

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.415
Length to Beam Ratio: 7.60 : 1
'Natural speed' for length: 15.63 kts
Power going to wave formation at top speed: 62 %
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: 14.54 ft / 4.43 m
- Forecastle (20 %): 9.25 ft / 2.82 m
- Mid (50 %): 9.25 ft / 2.82 m
- Quarterdeck (15 %): 9.25 ft / 2.82 m
- Stern: 9.25 ft / 2.82 m
- Average freeboard: 9.67 ft / 2.95 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 80.4 %
- Above water (accommodation/working, high = better): 114.2 %
Waterplane Area: 2,592 Square feet or 241 Square metres
Displacement factor (Displacement / loading): 172 %
Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.45
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Ships in class: Salzata, Okoto, Babreka, Bliznaka, Trilistnika, Ribnoto Ezero, and Dolnoto Ezero; named after the Seven Rila Lakes of Bulgaria