WesWorld

LordArpad
Spammer wanna be
Posts: 36
(5/10/03 7:52:21 am)
Reply Iberia DD 1920
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Hi Folks,

here is my 1st Destroyer, any comments?

A1, Iberia DD laid down 1920

Displacement:
1,186 t light; 1,223 t standard; 1,314 t normal; 1,381 t full load
Loading submergence 175 tons/feet

Dimensions:
344.49 ft x 32.81 ft x 10.17 ft (normal load)
105.00 m x 10.00 m x 3.10 m

Armament:
4 - 3.94" / 100 mm guns
6 - 0.79" / 20 mm AA guns
Weight of broadside 124 lbs / 56 kg
6 - 23.6" / 600 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 39,261 shp / 29,289 Kw = 34.40 kts
Range 3,500nm at 12.00 kts

Complement:
109 - 141

Cost:
£0.381 million / $1.524 million

Distribution of weights at normal displacement:
Armament: 15 tons, 1.2 %
Machinery: 762 tons, 58.0 %
Hull, fittings & equipment: 359 tons, 27.3 %
Fuel, ammunition & stores: 128 tons, 9.7 %
Miscellaneous weights: 50 tons, 3.8 %

Metacentric height 1.4

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is extremely poor
Room for accommodation & workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.22
Shellfire needed to sink: 266 lbs / 121 Kg = 8.7 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 75 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.14
Relative quality as seaboat: 1.01

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 9.61
'Natural speed' for length: 18.56 kts
Power going to wave formation at top speed: 68 %
Trim: 74
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 200.1 %
Relative accommodation and working space: 82.9 %
(Average = 100%)
Displacement factor: 45 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.46
(Structure weight / hull surface area: 30 lbs / square foot or 148 Kg / square metre)
Relative longitudinal hull strength: 1.13
(for 14.44 ft / 4.40 m average freeboard, freeboard adjustment 4.35 ft)
Relative composite hull strength: 0.50

Speed is too low - should be around 38 kn with these engines, going by historical examples

King of Riva
So you want to be a spammer
Posts: 126
(5/10/03 10:41:14 am)
Reply Not bad...
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Personally I think the guns are too small. Speed is not an issue. 34kn is good enough under most circumstances. Remember, springstyle handles speed under full load conditions, though. Your DD might be somewhat faster on a smaller displacement. So it is realistic. Most WW2-DDs did not exceed 33-34kn during war time services, even though most of them were designed for 36-38kn.

Your low cross-sectional hull strength concerns me. IIRC, the rule of thumb asks for a hull strength of at least 0.5 for DDs.

Anyway, a balanced design for 1920. I really would like to see a line drawing of this class. Will you present one some day?

LordArpad
Spammer wanna be
Posts: 38
(5/10/03 12:11:38 pm)
Reply Re: Not bad...
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Vielen Dank für die Blumen :-)

thanks for the input on speed. The 4 * 100 mm guns were not that unusual at the time I think - have a look at the torpedoes ;-)

As to line drawings - sorry, no. Much as I'd love to, but my drawing abilities (including the patience) are really bad. Sorry.

cheers

Bernhard

thesmilingassassin
Spammer wanna be
Posts: 89
(5/10/03 7:23:11 pm)
Reply not bad
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I would also go for larger guns, like 4.5" but with those torpedos shes not bad. As for line drawings i could do them for you just give me the armorment layout and what type of look you would like. I'll look up some pics of spanish ships and see what i can do in the asthetics department.

LordArpad
Spammer wanna be
Posts: 39
(5/11/03 10:09:48 am)
Reply Re: not bad
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Iberia is only now developing a 130 mm gun that will get used in the next class of destroyers.

Thanks for the offer of the line drawing, web.forodigital.es/uphm/mgl/buques/destroy.htm pretty mucc cover what i think they look like.

BTW somethink I really would _love_ to have a drawing of, is my El Cid class. any volunteers? Thanks muchly

Bernhard

LordArpad
Spammer wanna be
Posts: 40
(5/11/03 10:20:12 am)
Reply Re: not bad
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for the line drawing: take a look at the Alsedo class, only 2 guns forward, 2 guns aft (1 each superimposed)

thanks again

Bernhard