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Compaixão-class Riverine Hospital Ships
- Compaixão (NAH-1): laid down in Manaus January 1943, completed May 1943.
- Oswaldo Cruz (NAH-2): laid down in Manaus July 1943, completed November 1943.
- Misericórdia (NAH-3): laid down in Manaus January 1944, completed May 1944.
- Evandro Chagas (NAH-4): laid down in Manaus July 1944, completed November 1944.
- Protetor (NAH-5): laid down in Manaus January 1945, completed May 1945.
- Adolfo Lutz (NAH-6): laid down in Manaus July 1945, completed November 1945.

Barco Patrulha Rio-type Riverine Patrol Craft
- BPR-01: laid down in Manaus January 1943, completed January 1943.
- BPR-02: laid down in Manaus January 1943, completed January 1943.
- BPR-03: laid down in Manaus April 1943, completed April 1943.
- BPR-04: laid down in Manaus April 1943, completed April 1943.
- BPR-05: laid down in Manaus July 1943, completed July 1943.
- BPR-06: laid down in Manaus July 1943, completed July 1943.
- BPR-07: laid down in Manaus October 1943, completed October 1943.
- BPR-08: laid down in Manaus October 1943, completed October 1943.
- BPR-09: laid down in Manaus January 1944, completed January 1944.
- BPR-10: laid down in Manaus January 1944, completed January 1944.
- BPR-11: laid down in Manaus April 1944, completed April 1944.
- BPR-12: laid down in Manaus April 1944, completed April 1944.
- BPR-13: laid down in Manaus July 1944, completed July 1944.
- BPR-14: laid down in Manaus July 1944, completed July 1944.
- BPR-15: laid down in Manaus October 1944, completed October 1944.
- BPR-16: laid down in Manaus October 1944, completed October 1944.
- BPR-17: laid down in Manaus January 1945, completed January 1945.
- BPR-18: laid down in Manaus January 1945, completed January 1945.
- BPR-19: laid down in Manaus April 1945, completed April 1945.
- BPR-20: laid down in Manaus April 1945, completed April 1945.
- BPR-21: laid down in Manaus July 1945, completed July 1945.
- BPR-22: laid down in Manaus July 1945, completed July 1945.
- BPR-23: laid down in Manaus October 1945, completed October 1945.
- BPR-24: laid down in Manaus October 1945, completed October 1945.

Potengi-class Riverine Tanker
- Potengi: laid down in Manaus January 1943, completed May 1943.

Caboclo-class Construction Tender
- Caboclo: laid down in Macapa January 1943, completed May 1943.

Roraima-class River Monitors
- Roraima: Laid down in Manaus, January 1944.
- Rondônia: Laid down in Manaus, April 1944.
- Amapá: Laid down in Manaus, July 1944.
- Acre: Laid down in Manaus, October 1944.

Compaixão (NAH-1), Brazilian River Hospital Ship laid down 1943

Displacement:
250 t light; 256 t standard; 274 t normal; 289 t full load

Dimensions: Length overall / water x beam x draught
179.77 ft / 177.17 ft x 22.97 ft x 4.27 ft (normal load)
54.79 m / 54.00 m x 7.00 m x 1.30 m

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 339 shp / 253 Kw = 12.00 kts
Range 2,000nm at 12.00 kts
Bunker at max displacement = 33 tons

Complement:
33 - 43

Cost:
£0.065 million / $0.261 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 9 tons, 3.2 %
Hull, fittings & equipment: 101 tons, 37.0 %
Fuel, ammunition & stores: 24 tons, 8.7 %
Miscellaneous weights: 140 tons, 51.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
605 lbs / 274 Kg = 5.6 x 6 " / 152 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.46

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.553
Length to Beam Ratio: 7.71 : 1
'Natural speed' for length: 13.31 kts
Power going to wave formation at top speed: 36 %
Trim (Max stability = 0, Max steadiness = 100): 34
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: 14.76 ft / 4.50 m
- Forecastle (20 %): 13.78 ft / 4.20 m (5.91 ft / 1.80 m aft of break)
- Mid (50 %): 5.91 ft / 1.80 m
- Quarterdeck (15 %): 5.91 ft / 1.80 m
- Stern: 5.91 ft / 1.80 m
- Average freeboard: 7.56 ft / 2.30 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.7 %
- Above water (accommodation/working, high = better): 97.0 %
Waterplane Area: 2,847 Square feet or 264 Square metres
Displacement factor (Displacement / loading): 174 %
Structure weight / hull surface area: 25 lbs/sq ft or 122 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.40
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 24 tons: two 12t flat-bottom transport craft (based on landing craft)
- 6 tons: air conditioning
- 20 tons: dentistry office
- 20 tons: optometrist office
- 40 tons: operating ward
- 30 tons: supplies

Ships in Class:
- Compaixão (NAH-1): laid down in Manaus January 1943, completed May 1943.
- Oswaldo Cruz (NAH-2): on order.
- Misericórdia (NAH-3): on order.
- Evandro Chagas (NAH-4): on order.
- Protetor (NAH-5): on order.
- Adolfo Lutz (NAH-6): on order.

Notes:
- NAH = Navio de Assistência Hospitalar
- The vessel is equipped with two 12t boats (based on landing craft) intended to operate independently of the hospital ship, going up rivers not accessible to the main ship, or carrying medical parties and equipment.

Barco Patrulha Rio BPR-01, 70 River Patrol Craft, Brazilian Amazon Gunboat laid down 1943
Design by Snip.

Displacement:
70 t light; 75 t standard; 85 t normal; 93 t full load

Dimensions: Length overall / water x beam x draught
109.91 ft / 109.91 ft x 13.12 ft x 4.92 ft (normal load)
33.50 m / 33.50 m x 4.00 m x 1.50 m

Armament:
1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1943 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1943 Model
Machine guns in deck mount
on side aft
4 - 0.54" / 13.7 mm guns (2x2 guns), 0.11lbs / 0.05kg shells, 1943 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 2 lbs / 1 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.20" / 5 mm -
2nd: 0.20" / 5 mm - -
3rd: 0.20" / 5 mm - -

Machinery:
Petrol Internal combustion motors,
Geared drive, 3 shafts, 875 shp / 653 Kw = 18.00 kts
Range 2,250nm at 12.00 kts
Bunker at max displacement = 18 tons

Complement:
13 - 18

Cost:
£0.038 million / $0.153 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.3 %
Armour: 0 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 23 tons, 26.6 %
Hull, fittings & equipment: 40 tons, 47.3 %
Fuel, ammunition & stores: 15 tons, 17.6 %
Miscellaneous weights: 7 tons, 7.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
131 lbs / 59 Kg = 84.6 x 1.5 " / 37 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.3 ft / 0.1 m
Roll period: 10.1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.49

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.419
Length to Beam Ratio: 8.38 : 1
'Natural speed' for length: 10.48 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 34
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: 9.84 ft / 3.00 m
- Forecastle (20 %): 9.84 ft / 3.00 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 7.22 ft / 2.20 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.6 %
- Above water (accommodation/working, high = better): 86.4 %
Waterplane Area: 899 Square feet or 83 Square metres
Displacement factor (Displacement / loading): 156 %
Structure weight / hull surface area: 18 lbs/sq ft or 87 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.78
- Longitudinal: 9.37
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily

Ships in Class:
- BPR-01: laid down in Manaus January 1943, completed January 1943.
- BPR-02: laid down in Manaus January 1943, completed January 1943.
- BPR-03: laid down in Manaus April 1943, completed April 1943.
- BPR-04: laid down in Manaus April 1943, completed April 1943.
- BPR-05: laid down in Manaus July 1943, completed July 1943.
- BPR-06: laid down in Manaus July 1943, completed July 1943.
- BPR-07: laid down in Manaus October 1943, completed October 1943.
- BPR-08: laid down in Manaus October 1943, completed October 1943.
- BPR-09: laid down in Manaus January 1944, completed January 1944.
- BPR-10: laid down in Manaus January 1944, completed January 1944.
- BPR-11: laid down in Manaus April 1944, completed April 1944.
- BPR-12: laid down in Manaus April 1944, completed April 1944.
- BPR-13: laid down in Manaus July 1944, completed July 1944.
- BPR-14: laid down in Manaus July 1944, completed July 1944.
- BPR-15: laid down in Manaus October 1944, completed October 1944.
- BPR-16: laid down in Manaus October 1944, completed October 1944.
- BPR-17: laid down in Manaus January 1945, completed January 1945.
- BPR-18: laid down in Manaus January 1945, completed January 1945.
- BPR-19: laid down in Manaus April 1945, completed April 1945.
- BPR-20: laid down in Manaus April 1945, completed April 1945.
- BPR-21: laid down in Manaus July 1945, completed July 1945.
- BPR-22: laid down in Manaus July 1945, completed July 1945.
- BPR-23: laid down in Manaus October 1945, completed October 1945.
- BPR-24: laid down in Manaus October 1945, completed October 1945.

Potengi-class, Brazilian Riverine Tanker laid down 1943

Displacement:
309 t light; 320 t standard; 519 t normal; 679 t full load

Dimensions: Length overall / water x beam x draught
188.30 ft / 180.45 ft x 26.25 ft x 5.91 ft (normal load)
57.39 m / 55.00 m x 8.00 m x 1.80 m

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 508 shp / 379 Kw = 12.00 kts
Range 15,500nm at 12.00 kts
Bunker at max displacement = 360 tons

Complement:
53 - 70

Cost:
£0.077 million / $0.306 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 13 tons, 2.5 %
Hull, fittings & equipment: 146 tons, 28.1 %
Fuel, ammunition & stores: 210 tons, 40.5 %
Miscellaneous weights: 150 tons, 28.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,458 lbs / 661 Kg = 13.5 x 6 " / 152 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 0.9 ft / 0.3 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- 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: 0.650
Length to Beam Ratio: 6.88 : 1
'Natural speed' for length: 13.43 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.76 ft / 4.50 m
- Forecastle (25 %): 13.12 ft / 4.00 m (5.58 ft / 1.70 m aft of break)
- Mid (50 %): 5.58 ft / 1.70 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m (5.58 ft / 1.70 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 9.25 ft / 2.82 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.9 %
- Above water (accommodation/working, high = better): 71.7 %
Waterplane Area: 3,577 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 295 %
Structure weight / hull surface area: 27 lbs/sq ft or 133 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.81
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
N/A

Ships in Class:
- Potengi: laid down in Manaus January 1943, completed May 1943.

Caboclo-class, Brazilian Coastal Construction and Survey Tender laid down 1943
This ship is designed primarily to operate on the Amazon, supporting the construction of infrastructure such as, but not limited to, river navigational aids, flood-control projects, oil tank stockpiles, and other miscellany. Despite being primarily intended for the Amazon, it's designed to be useful in littoral environments as a light buoy tender or netlayer.

Displacement:
400 t light; 411 t standard; 578 t normal; 711 t full load

Dimensions: Length overall / water x beam x draught
137.80 ft / 134.51 ft x 29.53 ft x 8.53 ft (normal load)
42.00 m / 41.00 m x 9.00 m x 2.60 m

Armament:
1 - 0.31" / 7.9 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1943 Model
Machine gun in deck mount
on centreline forward
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 3,000

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 593 shp / 443 Kw = 12.00 kts
Range 11,000nm at 12.00 kts
Bunker at max displacement = 300 tons

Complement:
58 - 76

Cost:
£0.106 million / $0.423 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 15 tons, 2.7 %
Hull, fittings & equipment: 135 tons, 23.3 %
Fuel, ammunition & stores: 178 tons, 30.8 %
Miscellaneous weights: 250 tons, 43.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,047 lbs / 475 Kg = 69,057.7 x 0.3 " / 8 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.81

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.597
Length to Beam Ratio: 4.56 : 1
'Natural speed' for length: 11.60 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.12 ft / 4.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (20 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m before break)
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 9.19 ft / 2.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 56.6 %
- Above water (accommodation/working, high = better): 62.4 %
Waterplane Area: 2,897 Square feet or 269 Square metres
Displacement factor (Displacement / loading): 206 %
Structure weight / hull surface area: 31 lbs/sq ft or 152 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.43
- 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

Breakdown of Miscellaneous Weights:
- 20 tons for work crane
- 80 tons for metal/welding and woodworking shop
- 150 tons for cargo

Ships in Class:
- Caboclo: laid down in Macapa January 1943, completed May 1943.

Notes:
- Bunker simmed partially as cargo. Actual range is 2,500nm @ 12 knots. Bunker weighs 72t. 228t of cargo simmed as bunker fuel.

Roraima Class, Brazil River Gunboat laid down 1944

Displacement:
303 t light; 338 t standard; 403 t normal; 456 t full load

Dimensions: Length overall / water x beam x draught
183.34 ft / 180.45 ft x 34.78 ft x 4.99 ft (normal load)
55.88 m / 55.00 m x 10.60 m x 1.52 m

Armament:
2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1944 Model
Quick firing guns in deck mounts
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.54lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 113 lbs / 51 kg
Shells per gun, main battery: 400

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 1.97" / 50 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 600 shp / 448 Kw = 13.15 kts
Range 9,500nm at 10.00 kts
Bunker at max displacement = 118 tons

Complement:
44 - 58

Cost:
£0.166 million / $0.663 million

Distribution of weights at normal displacement:
Armament: 14 tons, 3.5 %
Armour: 13 tons, 3.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 10 tons, 2.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.6 %
Machinery: 15 tons, 3.8 %
Hull, fittings & equipment: 211 tons, 52.3 %
Fuel, ammunition & stores: 100 tons, 24.8 %
Miscellaneous weights: 50 tons, 12.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,545 lbs / 701 Kg = 29.3 x 4.7 " / 120 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.40
Metacentric height 1.9 ft / 0.6 m
Roll period: 10.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 1.86

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.451
Length to Beam Ratio: 5.19 : 1
'Natural speed' for length: 13.43 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 14.76 ft / 4.50 m
- Mid (40 %): 14.76 ft / 4.50 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (15 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 10.56 ft / 3.22 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 58.3 %
- Above water (accommodation/working, high = better): 169.4 %
Waterplane Area: 4,006 Square feet or 372 Square metres
Displacement factor (Displacement / loading): 195 %
Structure weight / hull surface area: 39 lbs/sq ft or 190 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.30
- 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

Misc Weight:
10 tons air conditioning
10 tons crew comforts
20 tons for accommodation for 10 Marines
10 tons future growth

Ships in Class:
- MIBN Roraima: Laid down in Manaus, January 1944.
- MIBN Rondônia: Laid down in Manaus, April 1944.
- MIBN Amapá: Laid down in Manaus, July 1944.
- MIBN Acre: Laid down in Manaus, October 1944.