WesWorld

ARA El Plata
[ARA Los Andes sunk 2/4/35]

El Plata Class Argentina Gunboat laid down 1932

Displacement:
493 t light; 542 t standard; 592 t normal; 633 t full load

Dimensions: Length overall / water x beam x draught
209.16 ft / 206.04 ft x 27.89 ft x 8.69 ft (normal load)
63.75 m / 62.80 m x 8.50 m x 2.65 m

Armament:
4 - 6.10" / 155 mm guns (2x2 guns), 97.00lbs / 44.00kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
3 - 2.95" / 75.0 mm guns in single mounts, 13.66lbs / 6.20kg shells, 1932 Model
Breech loading guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all forward
6 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 433 lbs / 196 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.76" / 70 mm 1.18" / 30 mm -
2nd: 1.18" / 30 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm - -
4th: 0.39" / 10 mm - -
5th: 0.39" / 10 mm - -

- Conning tower: 5.91" / 150 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,500 shp / 1,119 Kw = 16.28 kts
Range 3,500nm at 12.00 kts
Bunker at max displacement = 91 tons

Complement:
59 - 78

Cost:
£0.341 million / $1.364 million

Distribution of weights at normal displacement:
Armament: 62 tons, 10.5 %
Armour: 43 tons, 7.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 35 tons, 5.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 9 tons, 1.5 %
Machinery: 40 tons, 6.7 %
Hull, fittings & equipment: 307 tons, 51.8 %
Fuel, ammunition & stores: 100 tons, 16.9 %
Miscellaneous weights: 40 tons, 6.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
812 lbs / 368 Kg = 7.1 x 6.1 " / 155 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 1.2 ft / 0.4 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.415
Length to Beam Ratio: 7.39 : 1
'Natural speed' for length: 14.35 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.72 ft / 5.40 m
- Forecastle (15 %): 17.06 ft / 5.20 m
- Mid (35 %): 17.06 ft / 5.20 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (18 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 11.34 ft / 3.46 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 108.9 %
- Above water (accommodation/working, high = better): 125.0 %
Waterplane Area: 3,570 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 47 lbs/sq ft or 228 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.21
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Ex Paraguayan Gunboats seized from UPAF rebel forces Q4/34

ARA Humaita
ARA Paraguay

Paraguay Gunboat laid down 1930

Displacement:
600 t light; 636 t standard; 701 t normal; 753 t full load

Dimensions: Length overall / water x beam x draught
236.23 ft / 229.66 ft x 35.10 ft x 5.58 ft (normal load)
72.00 m / 70.00 m x 10.70 m x 1.70 m

Armament:
4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1930 Model
Quick firing guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
3 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.07kg shells, 1930 Model
Dual purpose guns in deck mounts
on side, all amidships, 1 raised mount
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all forward
4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1930 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
Weight of broadside 254 lbs / 115 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm -
2nd: 1.00" / 25 mm 0.50" / 13 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 2,138 shp / 1,595 Kw = 17.00 kts
Range 1,700nm at 16.00 kts
Bunker at max displacement = 116 tons

Complement:
67 - 88

Cost:
£0.237 million / $0.950 million

Distribution of weights at normal displacement:
Armament: 32 tons, 4.5 %
Armour: 14 tons, 2.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 2.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 65 tons, 9.2 %
Hull, fittings & equipment: 469 tons, 66.9 %
Fuel, ammunition & stores: 101 tons, 14.4 %
Miscellaneous weights: 20 tons, 2.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,178 lbs / 988 Kg = 41.3 x 4.7 " / 120 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.79

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.546
Length to Beam Ratio: 6.54 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 39
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: 18.04 ft / 5.50 m
- Forecastle (20 %): 18.04 ft / 5.50 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: 13.70 ft / 4.18 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69.0 %
- Above water (accommodation/working, high = better): 211.1 %
Waterplane Area: 5,604 Square feet or 521 Square metres
Displacement factor (Displacement / loading): 168 %
Structure weight / hull surface area: 54 lbs/sq ft or 263 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 4.60
- Overall: 1.02
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

ARA Parana
ARA Rosario
ARA Patria
ARA Pilcomayo

Project 616 Parana Class, Argentina River Gunboat laid down 1938

Displacement:
432 t light; 460 t standard; 501 t normal; 533 t full load

Dimensions: Length overall / water x beam x draught
231.09 ft / 229.66 ft x 26.25 ft x 6.56 ft (normal load)
70.44 m / 70.00 m x 8.00 m x 2.00 m

Armament:
2 - 6.10" / 155 mm guns in single mounts, 97.00lbs / 44.00kg shells, 1933 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
1 - 2.95" / 75.0 mm guns in single mounts, 13.67lbs / 6.20kg shells, 1933 Model
Breech loading gun in deck mount
on centreline amidships, 1 raised gun
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1933 Model
Anti-aircraft guns in deck mount
on side aft, all raised guns
8 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 211 lbs / 96 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm -
2nd: 1.97" / 50 mm 0.79" / 20 mm -
3rd: 0.59" / 15 mm - -
4th: 0.39" / 10 mm - -

- Armour deck: 1.38" / 35 mm, Conning tower: 2.95" / 75 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,000 shp / 746 Kw = 15.11 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 73 tons

Complement:
52 - 68

Cost:
£0.251 million / $1.004 million

Distribution of weights at normal displacement:
Armament: 30 tons, 6.1 %
Armour: 116 tons, 23.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 2.9 %
- Armour Deck: 97 tons, 19.5 %
- Conning Tower: 4 tons, 0.8 %
Machinery: 27 tons, 5.5 %
Hull, fittings & equipment: 233 tons, 46.5 %
Fuel, ammunition & stores: 69 tons, 13.7 %
Miscellaneous weights: 25 tons, 5.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,164 lbs / 528 Kg = 10.2 x 6.1 " / 155 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.38
Metacentric height 1.2 ft / 0.4 m
Roll period: 10.1 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.28
Seaboat quality (Average = 1.00): 1.83

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.443
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 27
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (15 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.43 ft / 2.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70.2 %
- Above water (accommodation/working, high = better): 114.9 %
Waterplane Area: 3,823 Square feet or 355 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 38 lbs/sq ft or 186 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.09
- Overall: 1.00
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