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Excalibur, Cascadian Dreadnought laid down 1927

Units: 4

  • CRS Excalibur
  • CRS Durandal
  • CRS Tizona
  • CRS Caladbolg



Displacement:
60,616 t light; 64,410 t standard; 69,451 t normal; 73,484 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(922.90 ft / 910.00 ft) x 121.00 ft x (35.50 / 37.22 ft)
(281.30 m / 277.37 m) x 36.88 m x (10.82 / 11.34 m)

Armament:
10 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
2 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
2 x Triple mounts on centreline ends, evenly spread
20 - 5.00" / 127 mm 43.0 cal guns - 61.05lbs / 27.69kg shells, 550 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
20 x Single mounts on sides, evenly spread
10 raised mounts
40 - 1.57" / 40.0 mm 40.0 cal guns - 1.87lbs / 0.85kg shells, 1,500 per gun
Anti-air guns in deck mounts, 1927 Model
20 x 2 row twin mounts on sides, evenly spread
20 raised mounts
32 - 1.00" / 25.4 mm 50.0 cal guns - 0.53lbs / 0.24kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
8 x 4 row quad mounts on centreline, evenly spread
4 raised mounts
Weight of broadside 40,313 lbs / 18,286 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 417.00 ft / 127.10 m 19.00 ft / 5.79 m
Ends: Unarmoured
Main Belt covers 70 % of normal length
Main Belt inclined 18.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:
4.00" / 102 mm 417.00 ft / 127.10 m 31.00 ft / 9.45 m
Beam between torpedo bulkheads 92.00 ft / 28.04 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 20.0" / 508 mm 12.0" / 305 mm 18.0" / 457 mm
2nd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm
3rd: 0.50" / 13 mm - -
4th: 0.10" / 3 mm - -

- Armoured deck - single deck:
For and Aft decks: 8.00" / 203 mm
Forecastle: 2.00" / 51 mm Quarter deck: 3.00" / 76 mm

- Conning towers: Forward 16.00" / 406 mm, Aft 6.00" / 152 mm

Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 4 shafts, 87,000 shp / 64,902 Kw = 24.04 kts
Range 10,000nm at 16.00 kts
Bunker at max displacement = 9,074 tons

Complement:
2,138 - 2,780

Cost:
£19.502 million / $78.009 million

Distribution of weights at normal displacement:
Armament: 4,905 tons, 7.1 %
- Guns: 4,905 tons, 7.1 %
Armour: 26,205 tons, 37.7 %
- Belts: 5,856 tons, 8.4 %
- Torpedo bulkhead: 1,913 tons, 2.8 %
- Armament: 6,941 tons, 10.0 %
- Armour Deck: 10,694 tons, 15.4 %
- Conning Towers: 801 tons, 1.2 %
Machinery: 2,746 tons, 4.0 %
Hull, fittings & equipment: 26,686 tons, 38.4 %
Fuel, ammunition & stores: 8,835 tons, 12.7 %
Miscellaneous weights: 75 tons, 0.1 %
- On freeboard deck: 75 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
117,181 lbs / 53,152 Kg = 40.2 x 18.0 " / 457 mm shells or 23.1 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 7.3 ft / 2.2 m
Roll period: 18.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.97
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0.622 / 0.628
Length to Beam Ratio: 7.52 : 1
'Natural speed' for length: 30.17 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 10.00 ft / 3.05 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 33.20 ft / 10.12 m, 25.00 ft / 7.62 m
- Forward deck: 30.00 %, 25.00 ft / 7.62 m, 20.00 ft / 6.10 m
- Aft deck: 35.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Quarter deck: 15.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Average freeboard: 22.41 ft / 6.83 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68.1 %
- Above water (accommodation/working, high = better): 154.9 %
Waterplane Area: 82,188 Square feet or 7,636 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 256 lbs/sq ft or 1,251 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.09
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

3 Scout Aircraft Included




Building Information Edit

CRS Excalibur
Builder: Mare Island Naval Yard, Mare Island
Laid: 23 March 1927


CRS Durandal
Builder: Mare Island Naval Yard, Mare Island
Laid: 2 April 1927


CRS Tizona
Builder: Mare Island Naval Yard, Mare Island
Laid: 24 June 1927


CRS Caladbolg
Builder: Mare Island Naval Yard, Mare Island
Laid: 2 July 1927

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