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Saved thread - RAN ligth cruiser

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Pengolodh_sc

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Thursday, May 15th 2003, 1:45am

Saved thread - RAN ligth cruiser

17inc
Spammer wanna be
Posts: 15
(4/23/03 2:31:32 am)
RAN ligth cruiser
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Chatham class, Royal Australian Navy Ligth Cruiser laid down 1917

Displacement:
        5,988 t light; 6,198 t standard; 6,844 t normal; 7,333 t full load
        Loading submergence 451 tons/feet

Dimensions:
        475.00 ft x 49.56 ft x 18.50 ft (normal load)

Armament:
        8 - 6 " (152 mm) (8 Main turrets x 1 guns)
        1 - 3 " (76 mm) AA
        4 - 0.4 " (10 mm)
        Weight of broadside 878 lbs (398 kg)
        2 - 21 " submerged torpedo tubes

Armour:
        
        Armour deck 2.00 "

Machinery:
        32,556 shp steam turbines, oil fired boilers = 26.00 kts, range 12,500nm at 10.00 kts

Complement:
        376 - 489

Cost:
        £0.852 million / $3.410 million

Distribution of weights at normal displacement:
        Armament: 110 tons, 1.6 %
        Armour: 584 tons, 8.5 %
        Belts: 0 tons, 0.0 %, Armament: 0 tons, 0.0 %, Armour Deck: 584 tons, 8.5 %
        Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 1,193 tons, 17.4 %
        Hull, fittings & equipment: 4,102 tons, 59.9 %
        Fuel, ammunition & stores: 855 tons, 12.5 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 2.1

Remarks:
        Hull space for machinery, storage & compartmentation is excellent
        Room for accommodation & workspaces is adequate
        Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
        Relative margin of stability: 1.11
        Shellfire needed to sink: 9,573 lbs = 88.6 x 6.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 1.7
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 71 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.36
        Relative quality as seaboat: 1.03

Hull form characteristics:
        Block coefficient: 0.55
        Sharpness coefficient: 0.35
        Hull speed coefficient 'M': 7.65
        'Natural speed' for length: 21.79 kts
        Power going to wave formation at top speed: 53 %
        Trim: 69
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 72.4 %
        Relative accommodation and working space: 112.2 %
        (Average = 100%)
        Displacement factor: 178 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 2.06
        (Structure weight per square foot of hull surface: 161 lbs)
        Relative longitudinal hull strength: 2.34
        (for 14.04 ft average freeboard)
        Relative composite hull strength: 2.09


AdmKuznetsov
Spammer wanna be
Posts: 15
(4/23/03 7:46:02 am)
Re: RAN ligth cruiser
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You only need a hull strength of 1.00. Any more on a warship is pretty much wasted hull strength. 26 kts is a bit slow for a light cruiser of the time, and a bit of belt and main battery armor would be a good idea.

Visit my Russian/French fantasy fleet page:
admkuznetsov.tripod.com

thesmilingassassin
Spammer wanna be
Posts: 31
(4/23/03 8:23:10 am)
aside from the hull strength
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...I'd lose a 6" gun and up the number of 3" AA to 4, one gun will not put up a significant AA barrage. You may want to add more 10 mm guns as well but i'd be worried more about the 3" guns. In the end you would have 7x6",4x3",10x10 mm and 2x21" torpedo tubes.