Due to the recent accident the RAN has begun to explore AA Cruisers options.
Which of the following might be better? The last one is an overgrown DL the other two are based on regular cruiser designs.
Adelaide, Australia AA Cruiser laid down 1933
Displacement:
5,231 t light; 5,497 t standard; 6,912 t normal; 8,045 t full load
Dimensions: Length overall / water x beam x draught
580.79 ft / 575.00 ft x 55.00 ft x 17.00 ft (normal load)
177.02 m / 175.26 m x 16.76 m x 5.18 m
Armament:
21 - 4.70" / 119 mm guns (7x3 guns), 51.91lbs / 23.55kg shells, 1933 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, 3 raised mounts
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.88kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 1,157 lbs / 525 kg
Shells per gun, main battery: 190
12 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.90" / 74 mm 400.00 ft / 121.92 m 7.00 ft / 2.13 m
Ends: Unarmoured
Main Belt covers 107 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.20" / 30 mm - -
- Armour deck: 1.20" / 30 mm, Conning tower: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 64,893 shp / 48,411 Kw = 33.00 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 2,548 tons
Complement:
378 - 492
Cost:
£2.692 million / $10.766 million
Distribution of weights at normal displacement:
Armament: 145 tons, 2.1 %
Armour: 876 tons, 12.7 %
- Belts: 333 tons, 4.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 47 tons, 0.7 %
- Armour Deck: 465 tons, 6.7 %
- Conning Tower: 31 tons, 0.5 %
Machinery: 1,891 tons, 27.4 %
Hull, fittings & equipment: 2,270 tons, 32.8 %
Fuel, ammunition & stores: 1,681 tons, 24.3 %
Miscellaneous weights: 50 tons, 0.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,734 lbs / 3,508 Kg = 149.0 x 4.7 " / 119 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.43
Metacentric height 3.8 ft / 1.2 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.23
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 10.45 : 1
'Natural speed' for length: 27.44 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 2.46 ft / 0.75 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (17 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (19 %): 17.00 ft / 5.18 m
- Stern: 17.00 ft / 5.18 m
- Average freeboard: 18.45 ft / 5.62 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 106.4 %
- Above water (accommodation/working, high = better): 144.4 %
Waterplane Area: 20,955 Square feet or 1,947 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 70 lbs/sq ft or 339 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 1.06
- Overall: 0.81
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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Adelaide, Australia AA Cruiser laid down 1933
Displacement:
4,710 t light; 4,923 t standard; 6,251 t normal; 7,313 t full load
Dimensions: Length overall / water x beam x draught
555.79 ft / 550.00 ft x 52.00 ft x 17.00 ft (normal load)
169.40 m / 167.64 m x 15.85 m x 5.18 m
Armament:
14 - 4.70" / 119 mm guns (7x2 guns), 51.91lbs / 23.55kg shells, 1933 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, 3 raised mounts
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.88kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 794 lbs / 360 kg
Shells per gun, main battery: 190
12 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.90" / 74 mm 370.00 ft / 112.78 m 7.00 ft / 2.13 m
Ends: Unarmoured
Main Belt covers 103 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.90" / 48 mm - -
- Armour deck: 1.20" / 30 mm, Conning tower: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 61,879 shp / 46,162 Kw = 33.00 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 2,390 tons
Complement:
350 - 456
Cost:
£2.367 million / $9.467 million
Distribution of weights at normal displacement:
Armament: 99 tons, 1.6 %
Armour: 818 tons, 13.1 %
- Belts: 309 tons, 4.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 60 tons, 1.0 %
- Armour Deck: 421 tons, 6.7 %
- Conning Tower: 29 tons, 0.5 %
Machinery: 1,803 tons, 28.8 %
Hull, fittings & equipment: 1,939 tons, 31.0 %
Fuel, ammunition & stores: 1,541 tons, 24.7 %
Miscellaneous weights: 50 tons, 0.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,491 lbs / 2,944 Kg = 125.0 x 4.7 " / 119 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.43
Metacentric height 3.5 ft / 1.1 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.20
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 10.58 : 1
'Natural speed' for length: 26.81 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 2.46 ft / 0.75 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (17 %): 19.00 ft / 5.79 m
- Mid (50 %): 17.00 ft / 5.18 m
- Quarterdeck (19 %): 17.00 ft / 5.18 m
- Stern: 17.00 ft / 5.18 m
- Average freeboard: 17.81 ft / 5.43 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 107.3 %
- Above water (accommodation/working, high = better): 128.4 %
Waterplane Area: 18,950 Square feet or 1,761 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 64 lbs/sq ft or 313 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.77
- Longitudinal: 1.08
- Overall: 0.80
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
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Adelaide, Australia AA Cruiser laid down 1934
Displacement:
3,882 t light; 4,088 t standard; 4,680 t normal; 5,153 t full load
Dimensions: Length overall / water x beam x draught
522.10 ft / 520.00 ft x 50.00 ft x 15.00 ft (normal load)
159.14 m / 158.50 m x 15.24 m x 4.57 m
Armament:
10 - 4.72" / 120 mm guns (5x2 guns), 52.58lbs / 23.85kg shells, 1934 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 2 raised mounts - superfiring
4 - 4.72" / 120 mm guns (2x2 guns), 52.58lbs / 23.85kg shells, 1934 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.88kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
10 - 0.79" / 20.0 mm guns (5x2 guns), 0.24lbs / 0.11kg shells, 1934 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 754 lbs / 342 kg
Shells per gun, main battery: 250
8 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 420.00 ft / 128.02 m 7.00 ft / 2.13 m
Ends: Unarmoured
Main Belt covers 124 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.20" / 30 mm - -
- Armour deck: 1.00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 51,936 shp / 38,745 Kw = 33.00 kts
Range 7,900nm at 15.00 kts
Bunker at max displacement = 1,065 tons
Complement:
282 - 367
Cost:
£2.083 million / $8.330 million
Distribution of weights at normal displacement:
Armament: 94 tons, 2.0 %
Armour: 574 tons, 12.3 %
- Belts: 235 tons, 5.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 27 tons, 0.6 %
- Armour Deck: 311 tons, 6.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,494 tons, 31.9 %
Hull, fittings & equipment: 1,680 tons, 35.9 %
Fuel, ammunition & stores: 798 tons, 17.0 %
Miscellaneous weights: 40 tons, 0.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,660 lbs / 1,660 Kg = 69.6 x 4.7 " / 120 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 2.8 ft / 0.8 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.20
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.420
Length to Beam Ratio: 10.40 : 1
'Natural speed' for length: 26.21 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.00 ft / 7.32 m
- Forecastle (30 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m (15.00 ft / 4.57 m aft of break)
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 17.60 ft / 5.36 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 121.2 %
- Above water (accommodation/working, high = better): 147.4 %
Waterplane Area: 16,828 Square feet or 1,563 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 62 lbs/sq ft or 305 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 1.19
- Overall: 0.75
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily