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Commencing in 1945 the Pristina class destroyers will undergo refits


Pristina, Yugoslav Fleet Destroyer laid down 1939 – Refitted 1945

Displacement: 1,679 t light; 1,755 t standard; 1,925 t normal; 2,060 t full load

Dimensions: Length overall / water x beam x draught

384.42 ft / 374.02 ft x 35.99 ft x 12.20 ft (normal load) [117.17 m / 114.00 m x 10.97 m x 3.72 m]

Armament:

4 - 4.72" / 120 mm guns in single mounts, 52.71lbs / 23.91kg shells, 1936 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.94lbs / 0.88kg shells, 1936 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1928 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 221 lbs / 100 kg
Shells per gun, main battery: 300
10 - 21.7" / 550 mm above water torpedoes

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.59" / 15 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm - -

Conning tower: 1.57" / 40 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 38,336 shp / 28,598 Kw = 34.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 304 tons

Complement: 144 - 188

Cost: £1.219 million / $4.875 million

Distribution of weights at normal displacement:

Armament: 28 tons, 1.4 %
Armour: 22 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 17 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.3 %
Machinery: 911 tons, 47.3 %
Hull, fittings & equipment: 659 tons, 34.2 %
Fuel, ammunition & stores: 246 tons, 12.8 %
Miscellaneous weights: 60 tons, 3.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 700 lbs / 318 Kg = 13.3 x 4.7 " / 120 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 1.6 ft / 0.5 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.410
Length to Beam Ratio: 10.39 : 1
'Natural speed' for length: 22.26 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.75 ft / 7.85 m
- Forecastle (20 %): 20.51 ft / 6.25 m
- Mid (45 %): 20.51 ft / 6.25 m (12.01 ft / 3.66 m aft of break)
- Quarterdeck (15 %): 12.01 ft / 3.66 m
- Stern: 12.01 ft / 3.66 m
- Average freeboard: 16.25 ft / 4.95 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 168.4 %
- Above water (accommodation/working, high = better): 79.7 %
Waterplane Area: 8,653 Square feet or 804 Square metres
Displacement factor (Displacement / loading): 81 %
Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.54
- Longitudinal: 2.23
- Overall: 0.62
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Update Sensor Suite:

DRBV-9 surface and air search radar (7.5 tons)
DRBI-3 sentry radar (7.5 tons)
DRBN-1 navigational surface and air search radar (2 tons)
DRBC-3B fire control radar (8 tons)
ARBR-1 radar jammer/detector (2 tons)
SAGEM HF/DF (3 tons)
ASDIC (8 tons)
Diesel-electric generator set for additional power (5 tons)
Gunnery computer for 120mm and 40mm guns (2 tons)
A/S outfit - four K-guns and two D/C racks (15 tons)

Service life extension

Level 3 Refit: (due to ASDIC)

Estimated cost: 252 tons per vessel
Estimated time: 49 days

The Mostar class light destroyers will also be refitted to give them a viable electronics suite; it is, however, less elaborate.


Mostar, Yugoslav Light Destroyer laid down 1941 – Refitted 1945

Displacement: 1,075 t light; 1,119 t standard; 1,215 t normal; 1,291 t full load

Dimensions: Length overall / water x beam x draught

356.99 ft / 344.49 ft x 31.50 ft x 9.35 ft (normal load) [108.81 m / 105.00 m x 9.60 m x 2.85 m]

Armament:

4 - 4.13" / 105 mm guns (2x2 guns), 35.32lbs / 16.02kg shells, 1941 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1941 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1941 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
Weight of broadside 150 lbs / 68 kg
Shells per gun, main battery: 220
6 - 21.7" / 550 mm above water torpedoes

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 26,536 shp / 19,796 Kw = 33.00 kts
Range 3,000nm at 15.00 kts
Bunker at max displacement = 172 tons

Complement: 102 - 133

Cost: £0.824 million / $3.296 million

Distribution of weights at normal displacement:

Armament: 19 tons, 1.5 %
Armour: 7 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 571 tons, 47.0 %
Hull, fittings & equipment: 444 tons, 36.6 %
Fuel, ammunition & stores: 139 tons, 11.5 %
Miscellaneous weights: 35 tons, 2.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 460 lbs / 208 Kg = 13.0 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 1.2 ft / 0.4 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.10

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak and transom stern
Block coefficient: 0.419
Length to Beam Ratio: 10.94: 1
'Natural speed' for length: 21.25 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 18.37 ft / 5.60 m (17.39 ft / 5.30 m aft of break)
- Mid (50 %): 17.06 ft / 5.20 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 14.35 ft / 4.38 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 167.4 %
- Above water (accommodation/working, high = better): 106.0 %
Waterplane Area: 7,017 Square feet or 652 Square metres
Displacement factor (Displacement / loading): 76 %
Structure weight / hull surface area: 33 lbs/sq ft or 159 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.53
- Longitudinal: 2.07
- Overall: 0.60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

Refit Plan:

Update Electronics

Add DRBV-9 Surface and Air Search Radar (7.5 tons)
Add DRBN-1 Navigational Surface and Air Search Radar (2.0 tons)
Add DRBC-3B Fire Control Radar (8.0 tons)
Add Diesel Generator Set (2.5 tons)

Add A/S outfit - four K-guns and two depth charge racks (15 tons)

Estimated cost: 54 tons

Estimated time: 16 days

Type I Patrol Submarine

Date: 1935
Coastal
Armament: 1x37mm, 2x20mm
Elec HP: 600 hp
Diesel HP: 1,500 hp
Crew: 49
Weight fuel and batteries: 100 tons
Light Displacement 414 tons
Loaded Displacement 461 tons
Full Displacement 540 tons
Reserve buoyancy: 15%
Max Surface Speed: 14.6 knots
Max Submerged Speed: 7.7 knots

Length: 50.0 meters
Beam: 6.0 meters
Draft: 3.6 meters
Crush depth: 200 meters
Armament: 1x37mm, 2x20mm
#TT: 4 x 21" (4 bow)
8 tons for reload torpedoes or mines
Tons Oil: 35
Tons Battery: 65
Miscellaneous Weight: 84 tons

Surface Range: 2,532 nm at 10 knots
Submerged Range: 31nm@ 7 knots

Breakdown of Miscellaneous Weights:

5 tons for radar and other electronics
9 tons for snort
70 tons for all other equipment


Refit:

Add snorkel and associated systems - 9 tons misc weight
Add radar and associated systems - 5 tons misc weight


Cost: 21 tons
Time: 7 days