Heavy Cruisers
Two improved Los Angeles class cruisers are to be laid down in the first quarter of 1945. The primary improvements are the fitting of the 8in/55RF Mk 16 in place of the 8in/55 Mk15 used on the Los Angeles. Also laid down this fiscal year are three of a new light cruiser class, the Worcester class. Essentially improved Olympia class these ships have the 6in/47DP first used on the Olympia's.
Philadelphia, United States Heavy Cruiser laid down 1945
Displacement:
18,763 t light; 19,638 t standard; 21,441 t normal; 22,883 t full load
Dimensions: Length overall / water x beam x draught
728.78 ft / 720.00 ft x 84.00 ft x 24.00 ft (normal load)
222.13 m / 219.46 m x 25.60 m x 7.32 m
Armament:
12 - 8.00" / 203 mm guns (4x3 guns), 335.00lbs / 151.95kg shells, 1945 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1945 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
4 - 5.00" / 127 mm guns (2x2 guns), 62.50lbs / 28.35kg shells, 1945 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
40 - 1.50" / 38.1 mm guns (10x4 guns), 1.69lbs / 0.77kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
52 - 0.75" / 19.1 mm guns (26x2 guns), 0.21lbs / 0.10kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 18 raised mounts
Weight of broadside 5,099 lbs / 2,313 kg
Shells per gun, main battery: 150
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 438.48 ft / 133.65 m 11.00 ft / 3.35 m
Ends: Unarmoured
Main Belt covers 94 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 3.00" / 76 mm 6.30" / 160 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
3rd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm
- Armour deck: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 118,765 shp / 88,598 Kw = 32.50 kts
Range 10,500nm at 15.00 kts
Bunker at max displacement = 3,245 tons
Complement:
885 - 1,151
Cost:
£10.895 million / $43.579 million
Distribution of weights at normal displacement:
Armament: 596 tons, 2.8 %
Armour: 5,759 tons, 26.9 %
- Belts: 1,649 tons, 7.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 959 tons, 4.5 %
- Armour Deck: 3,151 tons, 14.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,999 tons, 14.0 %
Hull, fittings & equipment: 8,609 tons, 40.2 %
Fuel, ammunition & stores: 2,678 tons, 12.5 %
Miscellaneous weights: 800 tons, 3.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
34,317 lbs / 15,566 Kg = 134.1 x 8.0 " / 203 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 4.5 ft / 1.4 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.52
Seaboat quality (Average = 1.00): 1.14
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.517
Length to Beam Ratio: 8.57 : 1
'Natural speed' for length: 30.94 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 7.00 degrees
Stern overhang: 4.36 ft / 1.33 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 36.00 ft / 10.97 m
- Forecastle (21 %): 23.00 ft / 7.01 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (18 %): 21.00 ft / 6.40 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 23.08 ft / 7.03 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.9 %
- Above water (accommodation/working, high = better): 196.8 %
Waterplane Area: 42,580 Square feet or 3,956 Square metres
Displacement factor (Displacement / loading): 124 %
Structure weight / hull surface area: 141 lbs/sq ft or 690 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.28
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Notes
- 600t for automated rapid fire 8in
- 110t for Electronic Suite
- 25t for fire control for 8in, 5in, 1.5in guns
- 50t for communications
- 15t for crew comforts (air conditioning, ice cream machine).
USS Worchester, United States Light Cruiser laid down 1944
Displacement:
12,139 t light; 12,773 t standard; 14,377 t normal; 15,660 t full load
Dimensions: Length overall / water x beam x draught
648.57 ft / 640.00 ft x 65.00 ft x 24.00 ft (normal load)
197.69 m / 195.07 m x 19.81 m x 7.32 m
Armament:
12 - 6.00" / 152 mm guns (6x2 guns), 130.00lbs / 58.97kg shells, 1944 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
24 - 3.00" / 76.2 mm guns (12x2 guns), 15.00lbs / 6.80kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 6 raised mounts - superfiring
12 - 1.50" / 38.1 mm guns (6x2 guns), 1.69lbs / 0.77kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0.75" / 19.1 mm guns (6x2 guns), 0.21lbs / 0.10kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 3 raised mounts
Weight of broadside 1,943 lbs / 881 kg
Shells per gun, main battery: 300
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 416.00 ft / 126.80 m 10.09 ft / 3.08 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 4.00" / 102 mm 5.00" / 127 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm -
- Armour deck: 2.25" / 57 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 100,000 shp / 74,600 Kw = 32.92 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 2,888 tons
Complement:
656 - 853
Cost:
£6.607 million / $26.427 million
Distribution of weights at normal displacement:
Armament: 238 tons, 1.7 %
Armour: 2,883 tons, 20.1 %
- Belts: 875 tons, 6.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 804 tons, 5.6 %
- Armour Deck: 1,204 tons, 8.4 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,554 tons, 17.8 %
Hull, fittings & equipment: 5,864 tons, 40.8 %
Fuel, ammunition & stores: 2,238 tons, 15.6 %
Miscellaneous weights: 600 tons, 4.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
24,078 lbs / 10,922 Kg = 222.9 x 6.0 " / 152 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 2.8 ft / 0.8 m
Roll period: 16.4 seconds
Steadiness - As gun platform (Average = 50 %): 85 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.70
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.504
Length to Beam Ratio: 9.85 : 1
'Natural speed' for length: 28.89 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 32.00 ft / 9.75 m
- Forecastle (20 %): 27.00 ft / 8.23 m
- Mid (50 %): 27.00 ft / 8.23 m
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 27.00 ft / 8.23 m
- Average freeboard: 27.40 ft / 8.35 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.1 %
- Above water (accommodation/working, high = better): 226.8 %
Waterplane Area: 28,931 Square feet or 2,688 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 109 lbs/sq ft or 533 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.59
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
210t for automated firing equipment
390t for other stuff.