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Pengolodh_sc

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Thursday, May 15th 2003, 2:21am

Saved thread - Heavy RAN Cruiser design

17inc
Spammer wanna be
Posts: 20
(4/23/03 11:30:43 pm)
Heavy RAN Cruiser design
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Like my 15" gun BB this has 12 8" gun 3x4 Turret this is my 3th go at a Heavy Cruiser with treaty lmits you note that she gos over it by 695tons will this be ok or not for a cruiser in this time line

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Ballalrat class, Royal Austrlian navy Cruiser laid down 1930

Displacement:
        11,283 t light; 11,829 t standard; 12,895 t normal; 13,695 t full load
        Loading submergence 905 tons/feet

Dimensions:
        630.00 ft x 68.50 ft x 16.60 ft (normal load)

Armament:
        12 - 8 " (203 mm) (3 Main turrets x 4 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        12 - 1.56 " (40 mm) AA
        20 - 0.8 " (20 mm)
        Weight of broadside 3,464 lbs (1,573 kg)
        12 - 21 " above water torpedoes

Armour:
        Belt 4.00 ", ends unarmoured, belts cover 70 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 8.00 "
        Conning tower 8.00 "

Machinery:
        81,030 shp steam turbines, oil fired boilers = 30.00 kts, range 6,700nm at 15.00 kts

Complement:
        605 - 786

Cost:
        £4.610 million / $18.441 million

Distribution of weights at normal displacement:
        Armament: 433 tons, 3.4 %
        Armour: 1,419 tons, 11.0 %
        Belts: 471 tons, 3.7 %, Armament: 853 tons, 6.6 %, Armour Deck: 0 tons, 0.0 %
        Conning Tower: 95 tons, 0.7 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 2,455 tons, 19.0 %
        Hull, fittings & equipment: 6,975 tons, 54.1 %
        Fuel, ammunition & stores: 1,612 tons, 12.5 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 2.9

Remarks:
        Hull space for machinery, storage & compartmentation is adequate
        Room for accommodation & workspaces is excellent
        Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Estimated overall survivability and seakeeping ability:
        Relative margin of stability: 1.01
        Shellfire needed to sink: 15,610 lbs = 61.0 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.0
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 60 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.49
        Relative quality as seaboat: 0.77

Hull form characteristics:
        Block coefficient: 0.63
        Sharpness coefficient: 0.38
        Hull speed coefficient 'M': 8.22
        'Natural speed' for length: 25.10 kts
        Power going to wave formation at top speed: 54 %
        Trim: 78
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 88.1 %
        Relative accommodation and working space: 128.9 %
        (Average = 100%)
        Displacement factor: 132 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.36
        (Structure weight per square foot of hull surface: 161 lbs)
        Relative longitudinal hull strength: 1.02
        (for 15.99 ft average freeboard, freeboard adjustment 0.06 ft)
        Relative composite hull strength: 1.09


Edited by: 17inc at: 4/23/03 11:34:13 pm

thesmilingassassin
Spammer wanna be
Posts: 39
(4/24/03 12:09:18 am)
Quad 8"
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In 1930 i don't think it would be technically possible to have a quad 8" turret, a triple is however slightly possible. Give your design 30mm deck armor and your armor situation should be good.

thesmilingassassin
Spammer wanna be
Posts: 40
(4/24/03 12:15:36 am)
also
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...keep in mind that the simplier the design the more you can build and faster, a quad turret will take years to design and built and will surely give you problems. When designing a ship you also have to look at how your nations weapons are developeing. Normally turret design go's gradually, twins to triples then quads. The only instance i can think of off the top of my heas is the years inbetween twins and quads for the french with their battleships, but they started off small (13") and then went to 15". You have to have a design path and for realism you need a few disapointments and glitchs to deal with.

17inc
Spammer wanna be
Posts: 21
(4/24/03 2:14:54 am)
Re: also
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This ones the mark 4 design it has1"armour deck and by time the ships Are built the quad gramlams in the turrets will have been work out at the test gounds . puls the CA will be a test bed ship which will hearld in the new 15" gun BB i beter put it up so you can see in this post as well.

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Ballalrat class, Royal Austrlian navy Cruiser laid down 1930

Displacement:
        11,283 t light; 11,829 t standard; 12,895 t normal; 13,695 t full load
        Loading submergence 905 tons/feet

Dimensions:
        630.00 ft x 68.50 ft x 16.60 ft (normal load)

Armament:
        12 - 8 " (203 mm) (3 Main turrets x 4 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        12 - 1.56 " (40 mm) AA
        20 - 0.8 " (20 mm)
        Weight of broadside 3,464 lbs (1,573 kg)
        12 - 21 " above water torpedoes

Armour:
        Belt 4.00 ", ends unarmoured, belts cover 70 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 8.00 "
        Armour deck 1.00 ", Conning tower 8.00 "

Machinery:
        81,030 shp steam turbines, oil fired boilers = 30.00 kts, range 6,700nm at 15.00 kts

Complement:
        605 - 786

Cost:
        £4.610 million / $18.441 million

Distribution of weights at normal displacement:
        Armament: 433 tons, 3.4 %
        Armour: 2,005 tons, 15.5 %
        Belts: 471 tons, 3.7 %, Armament: 853 tons, 6.6 %, Armour Deck: 586 tons, 4.5 %
        Conning Tower: 95 tons, 0.7 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 2,455 tons, 19.0 %
        Hull, fittings & equipment: 6,390 tons, 49.6 %
        Fuel, ammunition & stores: 1,612 tons, 12.5 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 3.1

Remarks:
        Hull space for machinery, storage & compartmentation is adequate
        Room for accommodation & workspaces is excellent
        Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Estimated overall survivability and seakeeping ability:
        Relative margin of stability: 1.04
        Shellfire needed to sink: 15,861 lbs = 62.0 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.0
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 58 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.47
        Relative quality as seaboat: 0.78

Hull form characteristics:
        Block coefficient: 0.63
        Sharpness coefficient: 0.38
        Hull speed coefficient 'M': 8.22
        'Natural speed' for length: 25.10 kts
        Power going to wave formation at top speed: 54 %
        Trim: 75
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 88.1 %
        Relative accommodation and working space: 128.9 %
        (Average = 100%)
        Displacement factor: 124 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.25
        (Structure weight per square foot of hull surface: 148 lbs)
        Relative longitudinal hull strength: 0.93
        (for 15.99 ft average freeboard, freeboard adjustment 0.06 ft)
        Relative composite hull strength: 1.00


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Javes Bay, Royal Australian Navy Enter ship type laid down 1934

Displacement:
        36,995 t light; 39,586 t standard; 42,667 t normal; 44,961 t full load
        Loading submergence 1,795 tons/feet

Dimensions:
        825.00 ft x 118.00 ft x 29.50 ft (normal load)

Armament:
        12 - 15 " (381 mm) (3 Main turrets x 4 guns, 1 superfiring turret)
        12 - 4.5 " (114 mm) (6 2nd turrets x 2 guns)
        25 - 1.56 " (40 mm) AA
        50 - 0.8 " (20 mm)
        Weight of broadside 20,857 lbs (9,469 kg)

Armour:
        Belt 12.00 ", ends unarmoured, belts cover 75 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 13.00 ", 2nd turrets 1.00 ", AA gun shields 1.00 ", Light gun shields 1.00 "
        Armour deck 4.00 ", Conning tower 13.00 ", Torpedo bulkhead 1.00 "

Machinery:
        131,441 shp steam turbines, oil fired boilers = 29.00 kts, range 10,000nm at 15.00 kts

Complement:
        1,484 - 1,929

Cost:
        £19.706 million / $78.824 million

Distribution of weights at normal displacement:
        Armament: 2,607 tons, 6.1 %
        Armour: 11,663 tons, 27.3 %
        Belts: 2,686 tons, 6.3 %, Armament: 3,400 tons, 8.0 %, Armour Deck: 4,648 tons, 10.9 %
        Conning Tower: 344 tons, 0.8 %, Torpedo bulkhead: 585 tons, 1.4 %
        Machinery: 3,781 tons, 8.9 %
        Hull, fittings & equipment: 18,943 tons, 44.4 %
        Fuel, ammunition & stores: 5,672 tons, 13.3 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 6.8

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

Estimated overall survivability and seakeeping ability:
        Relative margin of stability: 1.03
        Shellfire needed to sink: 43,321 lbs = 25.7 x 15.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 6.1
        (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: 0.54
        Relative quality as seaboat: 1.03

Hull form characteristics:
        Block coefficient: 0.52
        Sharpness coefficient: 0.38
        Hull speed coefficient 'M': 7.22
        'Natural speed' for length: 28.72 kts
        Power going to wave formation at top speed: 48 %
        Trim: 74
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 91.9 %
        Relative accommodation and working space: 161.2 %
        (Average = 100%)
        Displacement factor: 106 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.00
        (Structure weight per square foot of hull surface: 226 lbs)
        Relative longitudinal hull strength: 1.04
        (for 20.00 ft average freeboard, freeboard adjustment -0.24 ft)
        Relative composite hull strength: 1.00


Edited by: 17inc at: 4/24/03 2:17:47 am

King of Riva
Spammer wanna be
Posts: 59
(4/24/03 4:23:46 am)
Comments
--------------------------------------------------------------------------------
On your latest design:

Quads are okay for a 1930 cruiser. The French planned quads for their BBs even before 1920 so you should be able to develope a 8" quad until 1930. But notice: A quad has its drawbacks like many eggs in on basket and slow training rate due to a large and heavy turret. The latter can be altered if you put two guns in one craddle thus reducing the beam of the gunhouse somewhat. On the other hand this will not allow you to independently raise your guns.

Your _not_ over the limits, actually you are _below_ them! 13,000 tons STANDARD are allowed. You "only" used 11,829 tons standard displacement. You maybe should read the treaty draft again.

Your designs belt is too short and does not protect all important parts of the hull. This could be okay if weight restrictions forces you to do so. Remember most treaty cruisers of the first generation did not have full scale protection of their hull. On the other hand it is nonsense to have a 4" belt on some part of the hull, 1,100ts left to play with and still a belt too short. SO you better alter the length of your belt.

The rest is okay - more or less.

You have plenty cross-sectional hull strength left to play with but no longitudinal hull strength. Hint: Raise your freeboard. It will bring down your cross-sec hs but raise your longitudinal and composite hull strength.

AdmKuznetsov
Spammer wanna be
Posts: 20
(4/24/03 9:53:07 am)
Re: Comments
--------------------------------------------------------------------------------

Quoted

Quads are okay for a 1930 cruiser. The French planned quads for their BBs even before 1920




There was a 1914 Russian design for a dreadnought with 3 quad 16" turrets, which was not realized due to the war, then the Civil War,...

I used it as the general basis for my 1918 Petr Veliki class battleship.

And a quad turret redesign on the Russian Sviatoslav class heavy cruiser is setting back <that> program a year and a half. Fortunately, the weapon and turret armor weights for 8x24cm and 12x21cm work out within ~10 tons of each other, so it won't change the hull stresses much.

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

17inc
Spammer wanna be
Posts: 22
(4/24/03 11:00:17 am)
Thanks guys
--------------------------------------------------------------------------------
I was working of ligth tons as to stand tons hears a update design for a Heavy Cruiser number 6

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Ballalrat class, Royal Austrlian navy Cruiser laid down 1930

Displacement:
        12,357 t light; 12,929 t standard; 14,123 t normal; 15,022 t full load
        Loading submergence 962 tons/feet

Dimensions:
        630.00 ft x 68.50 ft x 16.60 ft (normal load)

Armament:
        12 - 8 " (203 mm) (3 Main turrets x 4 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        12 - 1.56 " (40 mm) AA
        20 - 0.8 " (20 mm)
        Weight of broadside 3,464 lbs (1,573 kg)
        12 - 21 " above water torpedoes

Armour:
        Belt 9.00 ", ends unarmoured, belts cover 79 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 8.00 "
        Armour deck 1.00 ", Conning tower 9.00 "

Machinery:
        88,092 shp steam turbines, oil fired boilers = 30.00 kts, range 7,000nm at 15.00 kts

Complement:
        647 - 842

Cost:
        £4.893 million / $19.571 million

Distribution of weights at normal displacement:
        Armament: 433 tons, 3.1 %
        Armour: 2,931 tons, 20.8 %
        Belts: 1,195 tons, 8.5 %, Armament: 1,000 tons, 7.1 %, Armour Deck: 623 tons, 4.4 %
        Conning Tower: 113 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 2,669 tons, 18.9 %
        Hull, fittings & equipment: 6,324 tons, 44.8 %
        Fuel, ammunition & stores: 1,765 tons, 12.5 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 3.0

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: 20,957 lbs = 81.9 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.2
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 66 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.67
        Relative quality as seaboat: 1.00

Hull form characteristics:
        Block coefficient: 0.69
        Sharpness coefficient: 0.40
        Hull speed coefficient 'M': 7.97
        'Natural speed' for length: 25.10 kts
        Power going to wave formation at top speed: 56 %
        Trim: 66
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 85.5 %
        Relative accommodation and working space: 176.2 %
        (Average = 100%)
        Displacement factor: 120 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.03
        (Structure weight per square foot of hull surface: 130 lbs)
        Relative longitudinal hull strength: 1.18
        (for 22.00 ft average freeboard, freeboard adjustment 5.77 ft)
        Relative composite hull strength: 1.04


Edited by: 17inc at: 4/24/03 11:05:18 am

Red Admiral
Spammer wanna be
Posts: 3
(4/24/03 1:47:50 pm)
more speed
--------------------------------------------------------------------------------
For your design to be an effective cruiser 30knts is too slow. Most cruisers had 32+. so they can just run away leaving your ship wallowing. Also the quad 8" turrets will probably be a bit of a squeeze in the 68' wide hull.

What is interesting is the similarity of your sruiser to one of mine; mine however having a Nelson appearance to unnerve the enemy and more speed.

17inc
Spammer wanna be
Posts: 23
(4/24/03 10:44:20 pm)
this ones my London class
--------------------------------------------------------------------------------
this CA will be built befor i start work on my 1930s CA there will be 12 By 12 of London and Ballarat class of each CAs by the 1940s whith the RAN .and as for speed i bet you had to cut down on Armour to get speed up well there are two schools of thourth on this one is speed is Armour the resalts of that one where seen in 1916 when jackey frisher BCs where sunk at jutland so im supprised that you would bring that old cheast Nut up for faster CAs well i beleve in a well Armoured hull and good speed in a well balanced Design .Red Admiral


London Class, UK & AUST Cruisers laid down 1927

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Displacement:
        12,444 t light; 12,931 t standard; 14,205 t normal; 15,166 t full load
        Loading submergence 940 tons/feet

Dimensions:
        633.00 ft x 66.00 ft x 17.00 ft (normal load)

Armament:
        8 - 8 " (203 mm) (4 Main turrets x 2 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        12 - 1.56 " (40 mm) AA
        17 - 0.8 " (20 mm)
        Weight of broadside 2,440 lbs (1,108 kg)

Armour:
        Belt 9.00 ", ends unarmoured, belts cover 79 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 8.00 "
        Armour deck 1.40 ", Conning tower 9.00 "

Machinery:
        100,173 shp steam turbines, oil fired boilers = 31.00 kts, range 8,600nm at 14.00 kts

Complement:
        650 - 845

Cost:
        £4.125 million / $16.500 million

Distribution of weights at normal displacement:
        Armament: 305 tons, 2.1 %
        Armour: 3,133 tons, 22.1 %
        Belts: 1,174 tons, 8.3 %, Armament: 993 tons, 7.0 %, Armour Deck: 852 tons, 6.0 %
        Conning Tower: 114 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 3,162 tons, 22.3 %
        Hull, fittings & equipment: 5,844 tons, 41.1 %
        Fuel, ammunition & stores: 1,761 tons, 12.4 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 3.1

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: 1.08
        Shellfire needed to sink: 20,602 lbs = 80.5 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.1
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 62 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.50
        Relative quality as seaboat: 1.01

Hull form characteristics:
        Block coefficient: 0.70
        Sharpness coefficient: 0.40
        Hull speed coefficient 'M': 7.99
        'Natural speed' for length: 25.16 kts
        Power going to wave formation at top speed: 57 %
        Trim: 61
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 89.3 %
        Relative accommodation and working space: 216.9 %
        (Average = 100%)
        Displacement factor: 119 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.04
        (Structure weight per square foot of hull surface: 120 lbs)
        Relative longitudinal hull strength: 1.15
        (for 22.50 ft average freeboard, freeboard adjustment 6.26 ft)
        Relative composite hull strength: 1.05
[code]

Edited by: 17inc at: 4/25/03 4:15:36 am
 
[u]17inc[/u]
Spammer wanna be
Posts: 25
(4/25/03 3:55:45 am)
[b]this number 7 in CA design and london2[/b]
--------------------------------------------------------------------------------
you will note both Armoured parts of the ships are now 3,300tons and 3,134 tons 

[code]
London Class, UK & AUST Cruisers laid down 1927

Displacement:
        12,444 t light; 12,931 t standard; 14,205 t normal; 15,166 t full load
        Loading submergence 940 tons/feet

Dimensions:
        633.00 ft x 66.00 ft x 17.00 ft (normal load)

Armament:
        8 - 8 " (203 mm) (4 Main turrets x 2 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        14 - 1.56 " (40 mm) AA
        17 - 0.8 " (20 mm)
        Weight of broadside 2,443 lbs (1,109 kg)
        8 - 21 " above water torpedoes

Armour:
        Belt 9.00 ", ends unarmoured, belts cover 80 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 9.00 "
        Armour deck 1.50 ", Conning tower 9.00 "

Machinery:
        100,173 shp steam turbines, oil fired boilers = 31.00 kts, range 8,600nm at 14.00 kts

Complement:
        650 - 845

Cost:
        £4.126 million / $16.506 million

Distribution of weights at normal displacement:
        Armament: 305 tons, 2.2 %
        Armour: 3,330 tons, 23.4 %
        Belts: 1,189 tons, 8.4 %, Armament: 1,114 tons, 7.8 %, Armour Deck: 913 tons, 6.4 %
        Conning Tower: 114 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 3,162 tons, 22.3 %
        Hull, fittings & equipment: 5,647 tons, 39.8 %
        Fuel, ammunition & stores: 1,761 tons, 12.4 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 2.9

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: 20,045 lbs = 78.3 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.1
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 67 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.54
        Relative quality as seaboat: 1.00

Hull form characteristics:
        Block coefficient: 0.70
        Sharpness coefficient: 0.40
        Hull speed coefficient 'M': 7.99
        'Natural speed' for length: 25.16 kts
        Power going to wave formation at top speed: 57 %
        Trim: 67
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 89.3 %
        Relative accommodation and working space: 187.4 %
        (Average = 100%)
        Displacement factor: 117 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 1.00
        (Structure weight per square foot of hull surface: 116 lbs)
        Relative longitudinal hull strength: 1.09
        (for 22.40 ft average freeboard, freeboard adjustment 6.16 ft)
        Relative composite hull strength: 1.01

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Ballalrat class, Royal Austrlian navy Cruiser laid down 1930

Displacement:
        12,357 t light; 12,929 t standard; 14,123 t normal; 15,022 t full load
        Loading submergence 962 tons/feet

Dimensions:
        630.00 ft x 68.50 ft x 16.60 ft (normal load)

Armament:
        12 - 8 " (203 mm) (3 Main turrets x 4 guns, 1 superfiring turret)
        8 - 4.5 " (114 mm) (4 2nd turrets x 2 guns)
        12 - 1.56 " (40 mm) AA
        20 - 0.8 " (20 mm)
        Weight of broadside 3,464 lbs (1,573 kg)
        12 - 21 " above water torpedoes

Armour:
        Belt 9.00 ", ends unarmoured, belts cover 80 % of normal area
        Main belt does not fully protect magazines and engineering spaces
        Main turrets 9.00 "
        Armour deck 1.10 ", Conning tower 9.00 "

Machinery:
        88,092 shp steam turbines, oil fired boilers = 30.00 kts, range 7,000nm at 15.00 kts

Complement:
        647 - 842

Cost:
        £4.893 million / $19.571 million

Distribution of weights at normal displacement:
        Armament: 433 tons, 3.1 %
        Armour: 3,134 tons, 22.2 %
        Belts: 1,210 tons, 8.6 %, Armament: 1,125 tons, 8.0 %, Armour Deck: 685 tons, 4.8 %
        Conning Tower: 113 tons, 0.8 %, Torpedo bulkhead: 0 tons, 0.0 %
        Machinery: 2,669 tons, 18.9 %
        Hull, fittings & equipment: 6,121 tons, 43.3 %
        Fuel, ammunition & stores: 1,765 tons, 12.5 %
        Miscellaneous weights: 0 tons, 0.0 %

        Metacentric height 3.1

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: 1.04
        Shellfire needed to sink: 21,045 lbs = 82.2 x 8.0 " shells
        (Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
        Torpedoes needed to sink: 2.2
        (Approx number of typical torpedo hits needed to sink ship)
        Relative steadiness as gun platform: 64 %
        (Average = 50 %)
        Relative rocking effect from firing to beam: 0.66
        Relative quality as seaboat: 1.00

Hull form characteristics:
        Block coefficient: 0.69
        Sharpness coefficient: 0.40
        Hull speed coefficient 'M': 7.97
        'Natural speed' for length: 25.10 kts
        Power going to wave formation at top speed: 56 %
        Trim: 64
        (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
        Underwater volume absorbed by magazines and engineering spaces: 85.5 %
        Relative accommodation and working space: 176.2 %
        (Average = 100%)
        Displacement factor: 118 %
        (Displacement relative to loading factors)
        Relative cross-sectional hull strength: 0.99
        (Structure weight per square foot of hull surface: 126 lbs)
        Relative longitudinal hull strength: 1.13
        (for 22.00 ft average freeboard, freeboard adjustment 5.77 ft)
        Relative composite hull strength: 1.00


Edited by: 17inc at: 4/25/03 5:04:44 am