WesWorld

Patrol Craft of the of the Marinha Imperial

Pampeiro-class Patrol Craft
- MIBN Pampeiro: Constructed January 1943, in service.
- MIBN Benevente: Constructed January 1943, in service.
- MIBN Guaíba: Constructed April 1943, in service.
- MIBN Bertioga: Constructed April 1943, in service.
- MIBN Cananéia: Constructed July 1943, in service.
- MIBN Paratí: Constructed July 1943, in service.
- MIBN Beberibe: Constructed October 1943, in service.
- MIBN Grajaú: Constructed October 1943, in service.
- MIBN Carioca: Constructed January 1944, in service.
- MIBN Gurupi: Constructed January 1944, in service.
- MIBN Piratini: Constructed April 1944, in service.
- MIBN Bertioga: Constructed April 1944, in service.
- MIBN Guaporé: Constructed July 1944, in service.
- MIBN Bracuí: Constructed July 1944, in service.
- MIBN Caravelas: Constructed October 1944, in service.
- MIBN Baependi: Constructed October 1944, in service.

Pampeiro-class, Brazilian Light Patrol Craft laid down 1943

Displacement:
108 t light; 115 t standard; 137 t normal; 154 t full load

Dimensions: Length overall / water x beam x draught
116.91 ft / 114.83 ft x 18.04 ft x 5.25 ft (normal load)
35.63 m / 35.00 m x 5.50 m x 1.60 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1943 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1943 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 350

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

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 971 shp / 725 Kw = 18.00 kts
Range 2,300nm at 15.00 kts
Bunker at max displacement = 40 tons

Complement:
19 - 25

Cost:
£0.059 million / $0.237 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.5 %
Armour: 1 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 25 tons, 18.3 %
Hull, fittings & equipment: 63 tons, 45.8 %
Fuel, ammunition & stores: 29 tons, 21.0 %
Miscellaneous weights: 17 tons, 12.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
271 lbs / 123 Kg = 21.0 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.5 ft / 0.1 m
Roll period: 11.0 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0.13
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.440
Length to Beam Ratio: 6.36 : 1
'Natural speed' for length: 12.84 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 43
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: 11.81 ft / 3.60 m
- Forecastle (25 %): 9.84 ft / 3.00 m
- Mid (50 %): 7.55 ft / 2.30 m
- Quarterdeck (15 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 8.60 ft / 2.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.5 %
- Above water (accommodation/working, high = better): 109.5 %
Waterplane Area: 1,362 Square feet or 127 Square metres
Displacement factor (Displacement / loading): 160 %
Structure weight / hull surface area: 23 lbs/sq ft or 112 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.78
- Longitudinal: 9.10
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 3 tons for radar and ASDIC
- 4 tons for depth charges
- 10 tons for other ASW

Ships in Class:
- MIBN Pampeiro: Constructed January 1943, in service.
- MIBN Benevente: Constructed January 1943, in service.
- MIBN Guaíba: Constructed April 1943, in service.
- MIBN Bertioga: Constructed April 1943, in service.
- MIBN Cananéia: Constructed July 1943, in service.
- MIBN Paratí: Constructed July 1943, in service.
- MIBN Beberibe: Constructed October 1943, in service.
- MIBN Grajaú: Constructed October 1943, in service.
- MIBN Carioca: Constructed January 1944, in service.
- MIBN Gurupi: Constructed January 1944, in service.
- MIBN Piratini: Constructed April 1944, in service.
- MIBN Bertioga: Constructed April 1944, in service.
- MIBN Guaporé: Constructed July 1944, in service.
- MIBN Bracuí: Constructed July 1944, in service.
- MIBN Caravelas: Constructed October 1944, in service.
- MIBN Baependi: Constructed October 1944, in service.