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1

Friday, May 23rd 2003, 4:21am

Washington Treaty BB

Hi all,

while playing around with the light BB thing, I came up with this, under WT regulations:

Alcazar, Iberia BB laid down 1930

Displacement:
33,612 t light; 35,346 t standard; 38,038 t normal; 40,040 t full load
Loading submergence 1,720 tons/feet

Dimensions:
787.40 ft x 108.27 ft x 26.25 ft (normal load)
240.00 m x 33.00 m x 8.00 m

Armament:
8 - 13.78" / 350 mm guns (2 Main turrets x 4 guns)
16 - 5.12" / 130 mm guns (4 2nd turrets x 4 guns)
16 - 2.24" / 57 mm AA guns
32 - 1.38" / 35 mm guns
Weight of broadside 11,670 lbs / 5,294 kg
8 - 23.6" / 600 mm above water torpedoes

Armour:
Belt 13.78" / 350 mm, upper belt 9.45" / 240 mm, ends unarmoured
Belts cover 79 % of normal area
Main turrets 13.78" / 350 mm, 2nd turrets 5.51" / 140 mm
AA gun shields 0.79" / 20 mm, Light gun shields 0.79" / 20 mm
Armour deck 3.94" / 100 mm, Torpedo bulkhead 2.36" / 60 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 128,407 shp / 95,791 Kw = 29.00 kts
Range 9,000nm at 15.00 kts

Complement:
1,361 - 1,770

Cost:
£12.322 million / $49.288 million

Distribution of weights at normal displacement:
Armament: 1,459 tons, 3.8 %
Armour: 12,697 tons, 33.4 %
Belts: 4,253 tons, 11.2 %, Armament: 2,884 tons, 7.6 %, Armour Deck: 4,385 tons, 11.5 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 1,174 tons, 3.1 %
Machinery: 3,891 tons, 10.2 %
Hull, fittings & equipment: 15,506 tons, 40.8 %
Fuel, ammunition & stores: 4,426 tons, 11.6 %
Miscellaneous weights: 60 tons, 0.2 %

Metacentric height 7.7

Remarks:
Hull space for machinery, storage & compartmentation is excellent
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: 1.19
Shellfire needed to sink: 57,677 lbs / 26,162 Kg = 44.1 x 13.8 " / 350 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 8.6
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 76 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.46
Relative quality as seaboat: 1.34

Hull form characteristics:
Block coefficient: 0.595
Sharpness coefficient: 0.40
Hull speed coefficient 'M': 7.16
'Natural speed' for length: 28.06 kts
Power going to wave formation at top speed: 50 %
Trim: 57
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 78.2 %
Relative accommodation and working space: 203.1 %
(Average = 100%)
Displacement factor: 118 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.97
(Structure weight / hull surface area: 185 lbs / square foot or 905 Kg / square metre)
Relative longitudinal hull strength: 1.31
(for 26.25 ft / 8.00 m average freeboard, freeboard adjustment 6.47 ft)
Relative composite hull strength: 1.00

Armour is 12° inclined

2

Friday, May 23rd 2003, 3:14pm

Washington Treaty BB

With 350mm inclined at 12 degrees, the powerful Russian 381mm/52 will not penetrate until a range of 21,500m, as opposed to 25,600m against a 350mm vertical belt. Impressive what you get with an inclined belt.

3

Friday, May 23rd 2003, 3:53pm

Alcazar

Your seaboat rating is exceptional; have you considered reducing freeboard by a foot or two (to increase composite strength), and then increasing speed by another knot? You'd probably still top 1.20 for seakeeping...

Somebody's bound to ask, so I'll be first: quad secondaries?

4

Friday, May 23rd 2003, 10:04pm

Yep, D&S principle. Probabl not the soundest idea but Iberia is going for quads full blast.

cheers

Bernhard

5

Friday, May 23rd 2003, 10:14pm

Quoted

our seaboat rating is exceptional; have you considered reducing freeboard by a foot or two (to increase composite strength), and then increasing speed by another knot? You'd probably still top 1.20 for seakeeping...


tried it. I don't get the "good seaboat" comment. I need 8m of freeboard for that.

good suggestion though!

thanks

Bernhard