WesWorld

Repository for the year's design ideas.

Lubin, Yugoslav Ammunition Auxiliary laid down 1948

Displacement: 685 t light; 709 t standard; 1,085 t normal; 1,386 t full load

Dimensions: Length overall / water x beam x draught

196.32 ft / 190.94 ft x 36.09 ft x 9.19 ft (normal load) [59.84 m / 58.20 m x 11.00 m x 2.80 m]

Armament:

1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1948 Model Anti-aircraft gun in deck mount on centreline forward
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1948 Model Anti-aircraft guns in deck mounts on side, all amidships, 2 raised mounts – superfiring
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 600

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm 0.39" / 10 mm -

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 2,399 shp / 1,790 Kw = 16.00 kts
Range 20,000nm at 12.00 kts
Bunker at max displacement = 678 tons

Complement: 93 - 122

Cost: £0.243 million / $0.972 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Armour: 3 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 59 tons, 5.4 %
Hull, fittings & equipment: 323 tons, 29.8 %
Fuel, ammunition & stores: 400 tons, 36.9 %
Miscellaneous weights: 300 tons, 27.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,801 lbs / 1,270 Kg = 1,434.1 x 1.6 " / 40 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 75 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.34

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 5.29: 1
'Natural speed' for length: 13.82 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 56
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: 14.76 ft / 4.50 m
- Forecastle (30 %): 12.30 ft / 3.75 m
- Mid (45 %): 9.84 ft / 3.00 m
- Quarterdeck (35 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 11.06 ft / 3.37 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 49.3 %
- Above water (accommodation/working, high = better): 107.0 %
Waterplane Area: 5,040 Square feet or 468 Square metres
Displacement factor (Displacement / loading): 256 %
Structure weight / hull surface area: 44 lbs/sq ft or 216 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 2.85
- Overall: 1.08
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

Low-stowed cargo simmed as additional bunkers - true radius 9,000 nm on bunkers of 185 tons (BAM 332)

Breakdown of miscellaneous weight:

Provision for bow doors and loading ramp: 50 tons
Provision for cargo handling gear (cranes): 50 tons
Provision for up to 100 troops over short distances: 200 tons

Low stowed cargo - 390 tons

Bobovica class Landing Ship

Bobovica, Yugoslav Landing Ship laid down 1948

Displacement: 315 t light; 326 t standard; 350 t normal; 369 t full load

Dimensions: Length overall / water x beam x draught

164.04 ft / 164.04 ft x 19.69 ft x 4.10 ft (normal load) [50.00 m / 50.00 m x 6.00 m x 1.25 m]

Armament:

2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.88kg shells, 1948 Model Anti-aircraft guns in deck mount on centreline forward
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1948 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 1,200

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 98.43 ft / 30.00 m 3.94 ft / 1.20 m
Ends: Unarmoured
Main Belt covers 92 % of normal length

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

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 816 shp / 609 Kw = 14.00 kts
Range 3,300nm at 10.00 kts
Bunker at max displacement = 43 tons

Complement: 39 - 52

Cost: £0.107 million / $0.428 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.2 %
Armour: 15 tons, 4.3 %
- Belts: 13 tons, 3.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 20 tons, 5.7 %
Hull, fittings & equipment: 140 tons, 40.0 %
Fuel, ammunition & stores: 35 tons, 9.9 %
Miscellaneous weights: 140 tons, 40.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 849 lbs / 385 Kg = 434.7 x 1.6 " / 40 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.96

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.925
Length to Beam Ratio: 8.33: 1
'Natural speed' for length: 12.81 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 29
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: 13.12 ft / 4.00 m
- Forecastle (30 %): 10.66 ft / 3.25 m
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (40 %): 6.56 ft / 2.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 9.15 ft / 2.79 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 65.3 %
- Above water (accommodation/working, high = better): 120.8 %
Waterplane Area: 3,119 Square feet or 290 Square metres
Displacement factor (Displacement / loading): 175 %
Structure weight / hull surface area: 27 lbs/sq ft or 134 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 3.59
- Overall: 1.17
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of miscellaneous weight:

Provision for bow ramp - 20 tons
Provision for up to 60 troops, light vehicles or cargo - 120 tons

A useful little vessel, I like it.