Stara Planina, Bulgarian Fleet Tender laid down 1943
Displacement:
2,783 t light; 2,914 t standard; 4,060 t normal; 4,977 t full load
Dimensions: Length overall / water x beam x draught
369.25 ft / 360.89 ft x 47.57 ft x 14.27 ft (normal load)
112.55 m / 110.00 m x 14.50 m x 4.35 m
Armament:
8 - 2.24" / 57.0 mm guns (4x2 guns), 6.61lbs / 3.00kg shells, 1943 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1943 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 54 lbs / 24 kg
Shells per gun, main battery: 1,640
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -
- Armour deck: 0.79" / 20 mm, Conning tower: 2.17" / 55 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 6,452 shp / 4,813 Kw = 18.00 kts
Range 17,000nm at 15.00 kts
Bunker at max displacement = 2,063 tons
Complement:
253 - 330
Cost:
£0.828 million / $3.313 million
Distribution of weights at normal displacement:
Armament: 7 tons, 0.2 %
Armour: 198 tons, 4.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.2 %
- Armour Deck: 180 tons, 4.4 %
- Conning Tower: 12 tons, 0.3 %
Machinery: 167 tons, 4.1 %
Hull, fittings & equipment: 1,112 tons, 27.4 %
Fuel, ammunition & stores: 1,278 tons, 31.5 %
Miscellaneous weights: 1,300 tons, 32.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,134 lbs / 4,143 Kg = 1,616.5 x 2.2 " / 57 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 2.2 ft / 0.7 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.580
Length to Beam Ratio: 7.59 : 1
'Natural speed' for length: 19.00 kts
Power going to wave formation at top speed: 44 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (25 %): 19.69 ft / 6.00 m
- Mid (50 %): 16.40 ft / 5.00 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 14.68 ft / 4.48 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 51.8 %
- Above water (accommodation/working, high = better): 123.0 %
Waterplane Area: 12,324 Square feet or 1,145 Square metres
Displacement factor (Displacement / loading): 215 %
Structure weight / hull surface area: 60 lbs/sq ft or 292 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.49
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Notes:
Up to 1,500 tons of fuel can be earmarked for transfer to other craft.
Breakdown of Miscellaneous Weights:
- 115 tons for 7200 rounds of 105mm ammunition or 3782 rounds of 130mm ammunition
- 36 tons for 36,000 rounds of 40mm ammunition
- 249 tons for machine shop and repair facilities
- 50 tons for cranes and boat handling equipment (can lift MTBs onto aft deck for repair)
- 150 tons for 75 transient crewmen (MTB base ship)
- 350 tons for consumables
- 350 tons for parts
Ships in Class:
- Stara Planina: laid down January 1943, completed December 1943.
- Rodopi: laid down April 1943, completed March 1944.