Rio de la Plata & Rio Uruguay Armada

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Build to protect border in the Rio De la Plata -  Buenos Aires & Rio Uruguay borders.

P-100 Class, NUS Patrolboat laid down 1908 (Engine 1905)
4 patrol boats built

Displacement:
   245 t light; 252 t standard; 262 t normal; 271 t full load

Dimensions: Length overall / water x beam x draught
   158.74 ft / 155.00 ft x 18.00 ft x 8.00 ft (normal load)
   48.38 m / 47.24 m x 5.49 m  x 2.44 m

Armament:
     1 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1905 Model
     Quick firing gun in deck mount
     on centreline forward
     6 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1905 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 7 lbs / 3 kg
   Shells per gun, main battery: 200
   2 - 18.0" / 457.2 mm above water torpedoes

Armour:
  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.25" / 6 mm         -               -

  - Conning tower: 0.50" / 13 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 6,015 shp / 4,487 Kw = 25.00 kts
   Range 335nm at 12.00 kts
   Bunker at max displacement = 19 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   32 - 42

Cost:
   £0.031 million / $0.122 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0.3 %
   Armour: 1 tons, 0.3 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 0 tons, 0.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.2 %
   Machinery: 152 tons, 57.8 %
   Hull, fittings & equipment: 82 tons, 31.3 %
   Fuel, ammunition & stores: 17 tons, 6.4 %
   Miscellaneous weights: 10 tons, 3.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     61 lbs / 28 Kg = 15.2 x 2.0 " / 51 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.05
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.06
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.411
   Length to Beam Ratio: 8.61 : 1
   'Natural speed' for length: 12.45 kts
   Power going to wave formation at top speed: 73 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   Bow angle (Positive = bow angles forward): 14.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      15.00 ft / 4.57 m
      - Forecastle (30 %):   15.00 ft / 4.57 m
      - Mid (40 %):      15.00 ft / 4.57 m (7.00 ft / 2.13 m aft of break)
      - Quarterdeck (20 %):   7.00 ft / 2.13 m
      - Stern:      7.00 ft / 2.13 m
      - Average freeboard:   10.20 ft / 3.11 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 193.5 %
      - Above water (accommodation/working, high = better): 56.4 %
   Waterplane Area: 1,729 Square feet or 161 Square metres
   Displacement factor (Displacement / loading): 26 %
   Structure weight / hull surface area: 18 lbs/sq ft or 87 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 7.07
      - Overall: 0.65
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

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R-100 Class, NUS River Patrolboat laid down 1913 (Engine 1912)
2 patrol boats built
Displacement:
   195 t light; 202 t standard; 240 t normal; 271 t full load

Dimensions: Length overall / water x beam x draught
   208.00 ft / 205.00 ft x 20.75 ft x 4.67 ft (normal load)
   63.40 m / 62.48 m x 6.32 m  x 1.42 m

Armament:
      2 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1905 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1905 Model
     Quick firing guns in deck mounts
     on side, all amidships
      2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1905 Model
     Machine guns in deck mounts
     on side ends, evenly spread
   Weight of broadside 16 lbs / 7 kg
   Shells per gun, main battery: 180

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

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 634 ihp / 473 Kw = 15.00 kts
   Range 2 000nm at 12.00 kts
   Bunker at max displacement = 69 tons (100% coal)

Complement:
   29 - 39

Cost:
   £0.016 million / $0.063 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
   Armour: 2 tons, 0.7 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.7 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 42 tons, 17.5 %
   Hull, fittings & equipment: 139 tons, 58.0 %
   Fuel, ammunition & stores: 45 tons, 18.8 %
   Miscellaneous weights: 10 tons, 4.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     750 lbs / 340 Kg = 187.4 x 2.0 " / 51 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 11.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.423
   Length to Beam Ratio: 9.88 : 1
   'Natural speed' for length: 14.32 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 11.30 degrees
   Stern overhang: 1.00 ft / 0.30 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      10.00 ft / 3.05 m
      - Forecastle (20 %):   10.00 ft / 3.05 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.00 ft / 3.05 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69.0 %
      - Above water (accommodation/working, high = better): 165.6 %
   Waterplane Area: 2 521 Square feet or 234 Square metres
   Displacement factor (Displacement / loading): 215 %
   Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 4.29
      - Overall: 1.00
   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

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40T, NUS Parana RPB laid down 1919 (Engine 1916)




Displacement:
   40 t light; 42 t standard; 53 t normal; 62 t full load

Dimensions: Length overall / water x beam x draught
   82.02 ft / 82.02 ft x 12.14 ft x 3.71 ft (normal load)
   25.00 m / 25.00 m x 3.70 m  x 1.13 m

Armament:
     1 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1919 Model
     Quick firing gun in deck mount
     on centreline forward
     2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1919 Model
     Machine guns in deck mounts
     on centreline, evenly spread
   Weight of broadside 4 lbs / 2 kg
   Shells per gun, main battery: 200

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

Machinery:
   Petrol Internal combustion motors,
   Geared drive, 2 shafts, 380 shp / 283 Kw = 14.97 kts
   Range 2 000nm at 12.00 kts
   Bunker at max displacement = 20 tons

Complement:
   9 - 12

Cost:
   £0.008 million / $0.033 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 1.0 %
   Armour: 1 tons, 1.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1 tons, 1.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 14 tons, 26.8 %
   Hull, fittings & equipment: 22 tons, 41.4 %
   Fuel, ammunition & stores: 13 tons, 24.1 %
   Miscellaneous weights: 3 tons, 5.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     83 lbs / 37 Kg = 20.7 x 2.0 " / 51 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 1.16

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 6.76 : 1
   'Natural speed' for length: 9.06 kts
   Power going to wave formation at top speed: 69 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   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:      7.38 ft / 2.25 m
      - Forecastle (15 %):   6.40 ft / 1.95 m
      - Mid (40 %):      5.74 ft / 1.75 m
      - Quarterdeck (15 %):   5.41 ft / 1.65 m
      - Stern:      5.41 ft / 1.65 m
      - Average freeboard:   5.86 ft / 1.79 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 101.5 %
      - Above water (accommodation/working, high = better): 80.8 %
   Waterplane Area: 663 Square feet or 62 Square metres
   Displacement factor (Displacement / loading): 146 %
   Structure weight / hull surface area: 16 lbs/sq ft or 78 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.80
      - Longitudinal: 7.64
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform