WesWorld

Active Aircraft Carriers of the Marinha Imperial

Brasil, Great Britain/ Brazil Aircraft Carrier laid down 1938

Displacement:
15,129 t light; 15,634 t standard; 17,632 t normal; 19,230 t full load

Dimensions: Length overall / water x beam x draught
715.33 ft / 700.00 ft x 80.00 ft x 19.00 ft (normal load)
218.03 m / 213.36 m x 24.38 m x 5.79 m

Armament:
12 - 4.70" / 119 mm guns (6x2 guns), 51.91lbs / 23.55kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 8 raised mounts
12 - 0.52" / 13.2 mm guns (6x2 guns), 0.07lbs / 0.03kg shells, 1938 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 661 lbs / 300 kg
Shells per gun, main battery: 400

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 160.00 ft / 48.77 m 15.00 ft / 4.57 m
Ends: Unarmoured
Main Belt covers 35 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm 1.50" / 38 mm
2nd: 0.50" / 13 mm - -

- Armour deck: 2.50" / 64 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 140,000 shp / 104,440 Kw = 33.24 kts
Range 10,000nm at 16.00 kts
Bunker at max displacement = 3,596 tons

Complement:
764 - 994

Cost:
£6.401 million / $25.602 million

Distribution of weights at normal displacement:
Armament: 83 tons, 0.5 %
Armour: 2,415 tons, 13.7 %
- Belts: 524 tons, 3.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 31 tons, 0.2 %
- Armour Deck: 1,859 tons, 10.5 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 3,834 tons, 21.7 %
Hull, fittings & equipment: 5,998 tons, 34.0 %
Fuel, ammunition & stores: 2,503 tons, 14.2 %
Miscellaneous weights: 2,800 tons, 15.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
23,331 lbs / 10,583 Kg = 449.4 x 4.7 " / 119 mm shells or 2.4 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 4.7 ft / 1.4 m
Roll period: 15.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.13

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.580
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 26.46 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 62
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 46.00 ft / 14.02 m
- Forecastle (20 %): 46.00 ft / 14.02 m (19.50 ft / 5.94 m aft of break)
- Mid (50 %): 19.50 ft / 5.94 m
- Quarterdeck (20 %): 19.50 ft / 5.94 m
- Stern: 19.50 ft / 5.94 m
- Average freeboard: 24.80 ft / 7.56 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92.5 %
- Above water (accommodation/working, high = better): 195.4 %
Waterplane Area: 40,198 Square feet or 3,734 Square metres
Displacement factor (Displacement / loading): 130 %
Structure weight / hull surface area: 103 lbs/sq ft or 505 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.11
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Belt is box armour around magazines
Deck armour is 2in on ain deck and 0.5in burster on flight deck
Hangar deck: 545 x 60 x 17.5ft
Served by two 40 x 33ft lifts with capacity for 15,000lbs
One hydralic accelerator with capacity for 15,000lbs aircraft
Arrestor gear of 8 wires, 1 trickle wire, 2 forward wires and two safety barriers
36 aircraft usually carried (3x 12 aircraft squadrons)
9 crated spare aircraft carried for attrition replacement
Provision for two radio-location sets

Simed by Hood

Belo Horizonte, Brazilian (ex-Greek) Carrier laid down 1925 (Engine 1941)

Displacement:
14,392 t light; 14,792 t standard; 16,550 t normal; 17,957 t full load

Dimensions: Length overall / water x beam x draught
664.00 ft / 664.00 ft x 76.80 ft x 27.00 ft (normal load)
202.39 m / 202.39 m x 23.41 m x 8.23 m

Armament:
8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1941 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
24 - 1.10" / 27.9 mm guns (6x4 guns), 0.67lbs / 0.30kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 124 lbs / 56 kg
Shells per gun, main battery: 900

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.36" / 60 mm 375.50 ft / 114.45 m 16.40 ft / 5.00 m
Ends: Unarmoured
Main Belt covers 87 % of normal length

- Armour deck: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 95,287 shp / 71,084 Kw = 31.00 kts
Range 11,250nm at 15.00 kts
Bunker at max displacement = 3,165 tons

Complement:
729 - 948

Cost:
£2.852 million / $11.409 million

Distribution of weights at normal displacement:
Armament: 18 tons, 0.1 %
Armour: 2,391 tons, 14.4 %
- Belts: 626 tons, 3.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 1,765 tons, 10.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,518 tons, 15.2 %
Hull, fittings & equipment: 5,464 tons, 33.0 %
Fuel, ammunition & stores: 2,158 tons, 13.0 %
Miscellaneous weights: 4,000 tons, 24.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
24,690 lbs / 11,199 Kg = 1,828.9 x 3.0 " / 76 mm shells or 2.8 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 4.1 ft / 1.2 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.84

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.421
Length to Beam Ratio: 8.65 : 1
'Natural speed' for length: 25.77 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 41.50 ft / 12.65 m
- Forecastle (25 %): 40.00 ft / 12.19 m (22.00 ft / 6.71 m aft of break)
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (15 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 26.65 ft / 8.12 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.6 %
- Above water (accommodation/working, high = better): 182.8 %
Waterplane Area: 31,808 Square feet or 2,955 Square metres
Displacement factor (Displacement / loading): 143 %
Structure weight / hull surface area: 102 lbs/sq ft or 496 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.90
- 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

Sim by Brock.

Riachuelo Class (ex-Anatoli Class), Brazilian (ex-Greek) Aircraft Carrier laid down 1925

Displacement:
14,664 t light; 14,999 t standard; 16,550 t normal; 17,725 t full load
Loading submergence 816 tons/feet

Dimensions:
664.00 ft x 76.80 ft x 27.00 ft (normal load)
202.39 m x 23.41 m x 8.23 m

Armament: 24 - 1.57" / 40 mm guns8 - 0.50" / 13 mm AA guns
Weight of broadside 47 lbs / 21 kg
Armour: Belt 6.00" / 152 mm, ends unarmoured
Belts cover 87 % of normal area
Armour deck 3.00" / 76 mm Machinery: Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 89,467 shp / 66,743 Kw = 30.50 kts
Range 8,500nm at 15.00 kts

Complement:
729 - 948

Cost:
£3.027 million / $12.107 million

Distribution of weights at normal Displacement: Armament: 6 tons, 0.0 % Armour: 2,570 tons, 15.5 %
Belts: 986 tons, 6.0 %, Armament: 0 tons, 0.0 %, Armour Deck: 1,584 tons, 9.6 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 % Machinery: 2,905 tons, 17.6 %
Hull, fittings & equipment: 4,783 tons, 28.9 %
Fuel, ammunition & stores: 1,886 tons, 11.4 %
Miscellaneous weights: 4,400 tons, 26.6 %

Metacentric height 3.6

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.03
Shellfire needed to sink: 18,315 lbs / 8,308 Kg = 169.6 x 6 " / 152 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.3
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 1.27

Hull form characteristics:
Block coefficient: 0.421
Sharpness coefficient: 0.32
Hull speed coefficient 'M': 7.97
'Natural speed' for length: 25.77 kts
Power going to wave formation at top speed: 50 %
Trim: 55
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 86.7 %
Relative accommodation and working space: 134.3 %
(Average = 100%)
Displacement factor: 129 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.99
(Structure weight / hull surface area: 103 lbs / square foot or 501 Kg / square metre)
Relative longitudinal hull strength: 1.13
(for 18.00 ft / 5.49 m average freeboard, freeboard adjustment 1.25 ft)
Relative composite hull strength: 1.00

Two Ships
Riachuelo
Aquidaban

Sim by Sachmle

Imperial, Brazil (Vickers Export Design) Aircraft Carrier laid down 1947

Displacement:
16,200 t light; 16,713 t standard; 19,052 t normal; 20,923 t full load

Dimensions: Length overall / water x beam x draught
705.26 ft / 688.98 ft x 95.96 ft x 18.47 ft (normal load)
214.96 m / 210.00 m x 29.25 m x 5.63 m

Armament:
8 - 4.70" / 119 mm guns (4x2 guns), 52.91lbs / 24.00kg shells, 1947 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all forward, all raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1947 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
16 - 0.79" / 20.0 mm guns (8x2 guns), 0.24lbs / 0.11kg shells, 1947 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 452 lbs / 205 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.95" / 75 mm 211.61 ft / 64.50 m 9.02 ft / 2.75 m
Ends: Unarmoured
Main Belt covers 47 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:
0.98" / 25 mm 524.93 ft / 160.00 m 16.99 ft / 5.18 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm 0.20" / 5 mm -
3rd: 0.59" / 15 mm 0.20" / 5 mm -

- Armour deck: 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 115,000 shp / 85,790 Kw = 31.05 kts
Range 12,000nm at 16.00 kts
Bunker at max displacement = 4,210 tons

Complement:
810 - 1,054

Cost:
£7.419 million / $29.675 million

Distribution of weights at normal displacement:
Armament: 66 tons, 0.3 %
Armour: 2,319 tons, 12.2 %
- Belts: 295 tons, 1.5 %
- Torpedo bulkhead: 325 tons, 1.7 %
- Armament: 26 tons, 0.1 %
- Armour Deck: 1,674 tons, 8.8 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,841 tons, 14.9 %
Hull, fittings & equipment: 6,724 tons, 35.3 %
Fuel, ammunition & stores: 2,852 tons, 15.0 %
Miscellaneous weights: 4,250 tons, 22.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
33,540 lbs / 15,214 Kg = 646.1 x 4.7 " / 119 mm shells or 5.3 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 6.8 ft / 2.1 m
Roll period: 15.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.12

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.546
Length to Beam Ratio: 7.18 : 1
'Natural speed' for length: 26.25 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 62
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (25 %): 31.00 ft / 9.45 m (21.00 ft / 6.40 m aft of break)
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 23.50 ft / 7.16 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.7 %
- Above water (accommodation/working, high = better): 227.0 %
Waterplane Area: 45,970 Square feet or 4,271 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 111 lbs/sq ft or 540 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.10
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Class Names: HMS Albion, Centaur

Belt is box armour around magazines

Hangar deck: 545 x 65 x 17.5ft
Served by two 55 x 44ft lifts with capacity for 30,000lbs
Two hydralic accelerators with capacity for 30,000lbs aircraft
Arrestor gear of 9 wires, 1 trickle wire, 2 forward wires and two safety barriers

48 aircraft usually carried (4x 12 aircraft squadrons)
6 crated spare aircraft carried for attrition replacement

Electric Equipment:
One Aerial Search RDF set
One Surface Search RDF set
Four Gunnery RDF sets
VHF Direction Finder/ Homing Beacon


MIBN Imperial: planned completion Q1/1949