WesWorld

Argentine Ships 1932

First is the Chaco Class Minelayers. Designed for coastal operations these small craft will operate as patrol boats in peacetime and in war will lay defensive minefields close to shore at night. Two will be built Chaco and Chubut and maybe two later for customs. If DC are fitted these craft will be A/S escorts to be used with Indomita or Guardia Class vessels.

Chaco Class, Argentina Minelayer/ Minesweeper laid down 1932

Displacement:
315 t light; 327 t standard; 359 t normal; 384 t full load

Dimensions: Length overall / water x beam x draught
176.57 ft / 170.60 ft x 22.97 ft x 6.23 ft (normal load)
53.82 m / 52.00 m x 7.00 m x 1.90 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 28.66lbs / 13.00kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
5 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, majority forward
Weight of broadside 59 lbs / 27 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -

- Conning tower: 1.97" / 50 mm

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.43 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 57 tons

Complement:
40 - 53

Cost:
£0.099 million / $0.394 million

Distribution of weights at normal displacement:
Armament: 8 tons, 2.2 %
Armour: 5 tons, 1.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.6 %
Machinery: 30 tons, 8.2 %
Hull, fittings & equipment: 162 tons, 45.2 %
Fuel, ammunition & stores: 44 tons, 12.3 %
Miscellaneous weights: 110 tons, 30.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
787 lbs / 357 Kg = 25.8 x 3.9 " / 100 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.28
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.514
Length to Beam Ratio: 7.43 : 1
'Natural speed' for length: 13.06 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 30
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: 16.40 ft / 5.00 m
- Forecastle (14 %): 16.40 ft / 5.00 m
- Mid (40 %): 16.40 ft / 5.00 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (20 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 11.09 ft / 3.38 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.3 %
- Above water (accommodation/working, high = better): 139.0 %
Waterplane Area: 2,644 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 152 %
Structure weight / hull surface area: 30 lbs/sq ft or 148 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.81
- Longitudinal: 6.52
- Overall: 1.00
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


Next are the Guardia Class Minesweepers/ Escorts. These vessels will act as patrol boats in peacetime and in war will be fully fitted minesweepers. Equipment is fitted for contact mine clearance and twin screws gives added manoeuvrability. Sonar is fitted as are four DCT and one DCR. Four of these will be built with two more in 1934.



Guardia Class, Argentina Patrol/Minesweeper laid down 1932

Displacement:
618 t light; 635 t standard; 687 t normal; 728 t full load

Dimensions: Length overall / water x beam x draught
224.65 ft / 219.82 ft x 34.45 ft x 7.74 ft (normal load)
68.47 m / 67.00 m x 10.50 m x 2.36 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 28.66lbs / 13.00kg shells, 1932 Model
Quick firing gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft
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 amidships
Weight of broadside 32 lbs / 15 kg
Shells per gun, main battery: 180

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2,715 ihp / 2,025 Kw = 18.52 kts
Range 2,500nm at 12.00 kts
Bunker at max displacement = 93 tons

Complement:
66 - 87

Cost:
£0.212 million / $0.849 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.6 %
Armour: 2 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 153 tons, 22.3 %
Hull, fittings & equipment: 339 tons, 49.3 %
Fuel, ammunition & stores: 69 tons, 10.0 %
Miscellaneous weights: 120 tons, 17.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,605 lbs / 728 Kg = 52.6 x 3.9 " / 100 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 1.6 ft / 0.5 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.410
Length to Beam Ratio: 6.38 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 15.00 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 (15 %): 16.40 ft / 5.00 m
- Mid (70 %): 16.40 ft / 5.00 m
- Quarterdeck (18 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 14.14 ft / 4.31 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.7 %
- Above water (accommodation/working, high = better): 210.1 %
Waterplane Area: 4,689 Square feet or 436 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 41 lbs/sq ft or 202 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.46
- 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

Also built will be the two Light Scout Cruisers Nueve de Julio (in Atlantis) and Comodore Py, two P-Class submarines and hopefully two/three Indomita Class Escort Destroyers along with the new Los Andes Class.





Colours
Below is the colour scheme all ships in the Argentine Navy will be repainted. The wartime camoflauge scheme will also apply to all ships with some alterations in some classes. Lighter upper colours have been used to reduce the shillouette of the ships.
(Picture by Red Admiral, enlarged and coloured by me)

I've decided to adapt the Chaco Class to an AA escort ship. Which is better a single heavy AA gun and light AA or just multiple light AA guns?
Chaco Class Variant A, Argentina AA Ship laid down 1932
Displacement:
312 t light; 327 t standard; 359 t normal; 384 t full load
Dimensions: Length overall / water x beam x draught
176.57 ft / 170.60 ft x 22.97 ft x 6.23 ft (normal load)
53.82 m / 52.00 m x 7.00 m x 1.90 m
Armament:
1 - 3.94" / 100 mm guns in single mounts, 28.66lbs / 13.00kg shells, 1932 Model
Anti-aircraft gun in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (1x4 guns), 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
24 - 0.79" / 20.0 mm guns (4x6 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
Weight of broadside 41 lbs / 18 kg
Shells per gun, main battery: 280
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.20" / 5 mm -
3rd: 0.47" / 12 mm - -
- Conning tower: 2.76" / 70 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.43 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 57 tons
Complement:
40 - 53
Cost:
£0.089 million / $0.355 million
Distribution of weights at normal displacement:
Armament: 5 tons, 1.5 %
Armour: 6 tons, 1.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.8 %
Machinery: 30 tons, 8.2 %
Hull, fittings & equipment: 161 tons, 44.9 %
Fuel, ammunition & stores: 47 tons, 13.1 %
Miscellaneous weights: 110 tons, 30.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
829 lbs / 376 Kg = 27.2 x 3.9 " / 100 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.514
Length to Beam Ratio: 7.43 : 1
'Natural speed' for length: 13.06 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 30
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: 16.40 ft / 5.00 m
- Forecastle (14 %): 16.40 ft / 5.00 m
- Mid (40 %): 16.40 ft / 5.00 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (20 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 11.09 ft / 3.38 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 139.0 %
Waterplane Area: 2,644 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 165 %
Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 6.43
- Overall: 1.02
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

Variant B Same but armed with 3x75mm AA, 2x1 37mm, 4x1 20mm and 70mm CT armour.

Variant D (1933/34 service) 2x115mm DP, 1x4 37mm 2x6 20mm and 70mm CT armour.

Chaco Class Variant E, Argentina AA Ship laid down 1932
Displacement:
279 t light; 327 t standard; 359 t normal; 384 t full load
Dimensions: Length overall / water x beam x draught
176.57 ft / 170.60 ft x 22.97 ft x 6.23 ft (normal load)
53.82 m / 52.00 m x 7.00 m x 1.90 m
Armament:
12 - 1.46" / 37.0 mm guns (3x4), 1.55lbs / 0.70kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, majority aft, 3 raised guns aft - superfiring
6 - 0.79" / 20.0 mm guns (1x6 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns - superfiring
24 - 0.79" / 20.0 mm guns (4x6 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
8 - 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
Weight of broadside 26 lbs / 12 kg
Shells per gun, main battery: 2,000
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm 0.20" / 5 mm -
2nd: 0.47" / 12 mm - -
3rd: 0.47" / 12 mm - -
4th: 0.39" / 10 mm - -
- Conning tower: 2.76" / 70 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.43 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 57 tons
Complement:
40 - 53
Cost:
£0.076 million / $0.303 million
Distribution of weights at normal displacement:
Armament: 3 tons, 0.9 %
Armour: 6 tons, 1.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.8 %
Machinery: 30 tons, 8.2 %
Hull, fittings & equipment: 160 tons, 44.7 %
Fuel, ammunition & stores: 80 tons, 22.2 %
Miscellaneous weights: 80 tons, 22.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
905 lbs / 411 Kg = 585.8 x 1.5 " / 37 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.514
Length to Beam Ratio: 7.43 : 1
'Natural speed' for length: 13.06 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 16.40 ft / 5.00 m
- Forecastle (14 %): 16.40 ft / 5.00 m
- Mid (40 %): 16.40 ft / 5.00 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (20 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 11.09 ft / 3.38 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70.5 %
- Above water (accommodation/working, high = better): 139.0 %
Waterplane Area: 2,644 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 210 %
Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 6.48
- Overall: 1.03
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

I'm partial to the first design.

The first design is better as it has a better chance of hitting High level bombers.

Mutiple light AA. The single 100mm has essentially no chance against aircraft. It is nuisance value only. However go with number 1 as the 100mm gives more options in other roles.

That was my thinking, multipull 37mm only severely limits her role. I'd acctually prefer a 500 ton version with 2x100mm.