WesWorld

Thanks to Brock for the sim

Minesweepers of a Chilean design, purchased by the Brazilian government in 1936 after the South American War. Four were gifted by the Chilean navy in 1936, the Brazilian navy plans on building four replacement vessels in 1938/39 for the Chilean Navy.

M-1 completed in 1936
M-2 completed in 1936
M-3 completed in 1936
M-4 completed in 1936
M-5 completed in 1936
M-6 completed in 1937
M-7 completed in 1936 (Chilean transferred)
M-8 completed in 1936 (Chilean transferred)
M-9 completed in 1936 (Chilean transferred)
M-10 completed in 1936 (Chilean transferred)

Chilean designed Minesweeper

Displacement:
425 t light; 440 t standard; 528 t normal; 599 t full load

Dimensions: Length overall / water x beam x draught
190.00 ft / 190.00 ft x 24.00 ft x 8.00 ft (normal load)
57.91 m / 57.91 m x 7.32 m x 2.44 m

Armament:
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1935 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns - superfiring
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1935 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 30 lbs / 14 kg
Shells per gun, main battery: 210

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.59" / 15 mm 0.59" / 15 mm
2nd: 0.59" / 15 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,385 shp / 1,033 Kw = 16.00 kts
Range 5,500nm at 13.00 kts
Bunker at max displacement = 160 tons

Complement:
54 - 71

Cost:
£0.120 million / $0.480 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.7 %
Armour: 4 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 39 tons, 7.4 %
Hull, fittings & equipment: 199 tons, 37.7 %
Fuel, ammunition & stores: 103 tons, 19.5 %
Miscellaneous weights: 179 tons, 33.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,082 lbs / 491 Kg = 80.1 x 3.0 " / 76 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.507
Length to Beam Ratio: 7.92 : 1
'Natural speed' for length: 13.78 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 15.50 ft / 4.72 m
- Forecastle (20 %): 11.00 ft / 3.35 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: 10.71 ft / 3.26 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 67.6 %
- Above water (accommodation/working, high = better): 110.3 %
Waterplane Area: 3,058 Square feet or 284 Square metres
Displacement factor (Displacement / loading): 181 %
Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 4.35
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

M-11 Class, Brazil Coastal Minesweeper laid down 1945

Displacement:
400 t light; 415 t standard; 487 t normal; 545 t full load

Dimensions: Length overall / water x beam x draught
199.57 ft / 196.85 ft x 24.61 ft x 8.20 ft (normal load)
60.83 m / 60.00 m x 7.50 m x 2.50 m

Armament:
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1945 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1945 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1945 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
Weight of broadside 30 lbs / 14 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,000 shp / 746 Kw = 15.06 kts
Range 6,500nm at 12.00 kts
Bunker at max displacement = 130 tons

Complement:
51 - 67

Cost:
£0.143 million / $0.573 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.8 %
Armour: 3 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 25 tons, 5.2 %
Hull, fittings & equipment: 188 tons, 38.6 %
Fuel, ammunition & stores: 87 tons, 17.8 %
Miscellaneous weights: 180 tons, 37.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,082 lbs / 491 Kg = 80.2 x 3.0 " / 76 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.429
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 44 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 15.42 ft / 4.70 m
- Forecastle (20 %): 10.83 ft / 3.30 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (20 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 10.55 ft / 3.22 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.3 %
- Above water (accommodation/working, high = better): 114.5 %
Waterplane Area: 3,039 Square feet or 282 Square metres
Displacement factor (Displacement / loading): 184 %
Structure weight / hull surface area: 32 lbs/sq ft or 156 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.02
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


MIBN M-11: completed 1945
MIBN M-12: completed 1945
MIBN M-13: completed 1945
MIBN M-14: completed 1945
MIBN M-15: completed 1946
MIBN M-16: completed 1946
MIBN M-17: completed 1946
MIBN M-18: completed 1946

M-19 Class, Brazil River Minesweeper laid down 1947

Displacement:
400 t light; 412 t standard; 476 t normal; 527 t full load

Dimensions: Length overall / water x beam x draught
231.97 ft / 229.66 ft x 24.61 ft x 4.92 ft (normal load)
70.71 m / 70.00 m x 7.50 m x 1.50 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1947 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1947 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1947 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 250

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

- Conning tower: 0.98" / 25 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 4,600 shp / 3,431 Kw = 22.04 kts
Range 5,500nm at 12.00 kts
Bunker at max displacement = 114 tons

Complement:
50 - 66

Cost:
£0.231 million / $0.922 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.4 %
Armour: 3 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 114 tons, 23.9 %
Hull, fittings & equipment: 232 tons, 48.7 %
Fuel, ammunition & stores: 76 tons, 15.9 %
Miscellaneous weights: 50 tons, 10.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,066 lbs / 483 Kg = 78.9 x 3.0 " / 76 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 0.8 ft / 0.3 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.599
Length to Beam Ratio: 9.33 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 46
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: 13.12 ft / 4.00 m
- Forecastle (20 %): 11.48 ft / 3.50 m
- Mid (50 %): 11.48 ft / 3.50 m
- Quarterdeck (22 %): 5.74 ft / 1.75 m (11.48 ft / 3.50 m before break)
- Stern: 5.74 ft / 1.75 m
- Average freeboard: 10.35 ft / 3.16 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93.2 %
- Above water (accommodation/working, high = better): 180.6 %
Waterplane Area: 4,129 Square feet or 384 Square metres
Displacement factor (Displacement / loading): 160 %
Structure weight / hull surface area: 34 lbs/sq ft or 164 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.53
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Carries minesweeping gear, can also be used as tugs

MIBN M-19: completed 1947
MIBN M-20: completed 1947
MIBN M-21: completed 1947
MIBN M-22: completed 1947