Fleet support remains the main emphasis of the construction programme as the fleet is already well served with modern warships and only a few refits of older ships are intended to modernise their AA defences and add radar.
The two main fleet support ships are tankers and MTB tenders.
The Project 723 vessel is an MTB tender, designed to support a flotilla away from their home base, hidden in a Patagonian cove. She has enough torpedoes and fuel to keep the MTBs topped up and has workshops for minor repairs. The Pr.723 is based on the Pr.716 river tender but is larger in dimensions for use in rougher waters and has some AA defence too. Two ships will be built.
Project 723, Argentina MTB Tender laid down 1949
Displacement:
578 t light; 596 t standard; 681 t normal; 749 t full load
Dimensions: Length overall / water x beam x draught
206.30 ft / 196.85 ft x 32.81 ft x 8.20 ft (normal load)
62.88 m / 60.00 m x 10.00 m x 2.50 m
Armament:
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mount
on centreline forward
2 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 3 lbs / 1 kg
Shells per gun, main battery: 2,000
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,500 shp / 1,119 Kw = 15.70 kts
Range 10,000nm at 10.00 kts
Bunker at max displacement = 154 tons
Complement:
66 - 86
Cost:
£0.196 million / $0.783 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.1 %
Armour: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 36 tons, 5.3 %
Hull, fittings & equipment: 211 tons, 30.9 %
Fuel, ammunition & stores: 103 tons, 15.1 %
Miscellaneous weights: 330 tons, 48.5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,077 lbs / 488 Kg = 696.6 x 1.5 " / 37 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.2 ft / 0.4 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.67
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.450
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 30
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (20 %): 14.76 ft / 4.50 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (20 %): 14.76 ft / 4.50 m (6.56 ft / 2.00 m before break)
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 9.97 ft / 3.04 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.7 %
- Above water (accommodation/working, high = better): 78.0 %
Waterplane Area: 4,120 Square feet or 383 Square metres
Displacement factor (Displacement / loading): 168 %
Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.24
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Class Names: El Austral, Atlantis
Misc Weight:
25 tons for crane
150 tons for workshops
150 tons for cargo/ reload torpedoes
5 tons for Philips surface search RDF set
Normal range 2500nm @ 10kts(43 tons), rest (112 tons) is petrol bunkerage for refuelling MTBs
The Project 725 tanker is fairly small but is cheaper and quicker to build than a larger tanker and hopefully won't make such a big target for RSAF bombers and RSAN submarines.
The SS report itself is a rip of my Dutch Antares Class but with some minor revisions.
Project 725, Argentina Tanker laid down 1949
Displacement:
1,985 t light; 2,070 t standard; 3,851 t normal; 5,276 t full load
Dimensions: Length overall / water x beam x draught
319.30 ft / 311.68 ft x 47.57 ft x 15.49 ft (normal load)
97.32 m / 95.00 m x 14.50 m x 4.72 m
Armament:
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1944 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, 1941 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 3,500
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 - -
Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 1,500 shp / 1,119 Kw = 12.05 kts
Range 50,000nm at 12.00 kts
Bunker at max displacement = 3,206 tons
Complement:
243 - 317
Cost:
£0.572 million / $2.288 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 1 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 36 tons, 0.9 %
Hull, fittings & equipment: 992 tons, 25.8 %
Fuel, ammunition & stores: 1,866 tons, 48.5 %
Miscellaneous weights: 955 tons, 24.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,626 lbs / 6,181 Kg = 8,816.3 x 1.5 " / 37 mm shells or 4.1 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 2.4 ft / 0.7 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.587
Length to Beam Ratio: 6.55 : 1
'Natural speed' for length: 17.65 kts
Power going to wave formation at top speed: 30 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (30 %): 21.33 ft / 6.50 m (13.12 ft / 4.00 m aft of break)
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (30 %): 20.67 ft / 6.30 m (13.12 ft / 4.00 m before break)
- Stern: 20.67 ft / 6.30 m
- Average freeboard: 18.24 ft / 5.56 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 31.8 %
- Above water (accommodation/working, high = better): 107.6 %
Waterplane Area: 10,457 Square feet or 971 Square metres
Displacement factor (Displacement / loading): 373 %
Structure weight / hull surface area: 55 lbs/sq ft or 268 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 3.00
- Overall: 1.00
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
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Class Names: San Luis, Mercedes
Misc Weight includes 100 tons for at-sea refuelling gear and derricks and 5 tons for a Phillips RDF set