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Thursday, May 27th 2004, 3:25pm

Portugals revisited

OK, RA badgered me into redesigning the Portugals to include TBs (the other BBs will follow):

Portugal, Iberia BB laid down 1914

Displacement:
32,418 t light; 34,675 t standard; 36,343 t normal; 37,533 t full load
Loading submergence 1,537 tons/feet

Dimensions:
682.41 ft x 104.99 ft x 27.23 ft (normal load)
208.00 m x 32.00 m x 8.30 m

Armament:
12 - 13.78" / 350 mm guns (4 Main turrets x 3 guns, 2 superfiring turrets)
16 - 6.69" / 170 mm guns
Secondary guns mounted low & subject to being washed down in a seaway
8 - 3.94" / 100 mm AA guns
4 - 2.24" / 57 mm guns
Weight of broadside 18,364 lbs / 8,330 kg
5 - 18.9" / 480 mm submerged torpedo tubes

Armour:
Belt 13.78" / 350 mm, upper belt 5.91" / 150 mm, ends unarmoured
Belts cover 96 % of normal area
Main turrets 13.78" / 350 mm, 2nd casemates 5.91" / 150 mm
AA gun shields 0.98" / 25 mm
Armour deck 2.95" / 75 mm, Conning tower 13.78" / 350 mm
Torpedo bulkhead 1.18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 75,640 shp / 56,427 Kw = 25.00 kts
Range 10,000nm at 10.00 kts

Complement:
1,316 - 1,710

Cost:
£4.417 million / $17.669 million

Distribution of weights at normal displacement:
Armament: 2,295 tons, 6.3 %
Armour: 12,284 tons, 33.8 %
Belts: 3,959 tons, 10.9 %, Armament: 4,532 tons, 12.5 %, Armour Deck: 2,939 tons, 8.1 %
Conning Tower: 327 tons, 0.9 %, Torpedo bulkhead: 528 tons, 1.5 %
Machinery: 2,914 tons, 8.0 %
Hull, fittings & equipment: 14,924 tons, 41.1 %
Fuel, ammunition & stores: 3,926 tons, 10.8 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 5.7

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.03
Shellfire needed to sink: 36,036 lbs / 16,346 Kg = 27.5 x 13.8 " / 350 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 4.7
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 61 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.64
Relative quality as seaboat: 1.07

Hull form characteristics:
Block coefficient: 0.652
Sharpness coefficient: 0.44
Hull speed coefficient 'M': 6.30
'Natural speed' for length: 26.12 kts
Power going to wave formation at top speed: 49 %
Trim: 57
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 95.4 %
Relative accommodation and working space: 158.4 %
(Average = 100%)
Displacement factor: 100 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.99
(Structure weight / hull surface area: 209 lbs / square foot or 1,021 Kg / square metre)
Relative longitudinal hull strength: 1.18
(for 20.34 ft / 6.20 m average freeboard, freeboard adjustment 0.74 ft)
Relative composite hull strength: 1.01

2

Friday, May 28th 2004, 7:06am

Carlos V, Iberia BB laid down 1911

Displacement:
25,267 t light; 26,927 t standard; 28,366 t normal; 29,403 t full load
Loading submergence 1,237 tons/feet

Dimensions:
613.52 ft x 95.14 ft x 26.57 ft (normal load)
187.00 m x 29.00 m x 8.10 m

Armament:
8 - 13.78" / 350 mm guns (4 Main turrets x 2 guns, 2 superfiring turrets)
16 - 6.69" / 170 mm guns
Secondary guns mounted low & subject to being washed down in a seaway
8 - 3.94" / 100 mm QF guns
Weight of broadside 13,108 lbs / 5,946 kg
5 - 18.9" / 480 mm submerged torpedo tubes

Armour:
Belt 12.99" / 330 mm, upper belt 7.87" / 200 mm, end belts 5.91" / 150 mm
Belts cover 90 % of normal area
Main turrets 12.99" / 330 mm, 2nd casemates 7.87" / 200 mm
QF gun shields 1.97" / 50 mm
Armour deck 2.95" / 75 mm, Conning tower 12.99" / 330 mm
Torpedo bulkhead 1.18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 48,196 shp / 35,954 Kw = 23.00 kts
Range 9,000nm at 10.00 kts

Complement:
1,092 - 1,420

Cost:
£2.535 million / $10.138 million

Distribution of weights at normal displacement:
Armament: 1,639 tons, 5.8 %
Armour: 10,551 tons, 37.2 %
Belts: 3,844 tons, 13.6 %, Armament: 3,618 tons, 12.8 %, Armour Deck: 2,365 tons, 8.3 %
Conning Tower: 261 tons, 0.9 %, Torpedo bulkhead: 463 tons, 1.6 %
Machinery: 1,956 tons, 6.9 %
Hull, fittings & equipment: 11,022 tons, 38.9 %
Fuel, ammunition & stores: 3,098 tons, 10.9 %
Miscellaneous weights: 100 tons, 0.4 %

Metacentric height 5.7

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.11
Shellfire needed to sink: 31,248 lbs / 14,174 Kg = 23.9 x 13.8 " / 350 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 4.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 51 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.56
Relative quality as seaboat: 1.22

Hull form characteristics:
Block coefficient: 0.640
Sharpness coefficient: 0.43
Hull speed coefficient 'M': 6.15
'Natural speed' for length: 24.77 kts
Power going to wave formation at top speed: 48 %
Trim: 42
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 88.9 %
Relative accommodation and working space: 148.6 %
(Average = 100%)
Displacement factor: 103 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.98
(Structure weight / hull surface area: 186 lbs / square foot or 910 Kg / square metre)
Relative longitudinal hull strength: 1.31
(for 19.69 ft / 6.00 m average freeboard, freeboard adjustment 1.03 ft)
Relative composite hull strength: 1.01