Indefatigable class, anachronistic, Great Britain Battlecruiser laid down 1911 (Engine 1914)
Displacement:
16,158 t light; 16,920 t standard; 18,958 t normal; 20,588 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(585.75 ft / 580.00 ft) x 80.00 ft x (26.00 / 27.76 ft)
(178.54 m / 176.78 m) x 24.38 m x (7.92 / 8.46 m)
Armament:
8 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
Breech loading guns in turret on barbette mounts , 1911 Model
1 x Twin mount on centreline, forward evenly spread
1 raised mount
2 x Triple mounts on centreline ends, majority forward
16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
Quick firing guns in deck and hoist mounts , 1911 Model
8 x Twin mounts on sides, forward deck aft
8 raised mounts
Weight of broadside 7,316 lbs / 7,316 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 390.00 ft / 118.87 m 16.00 ft / 4.88 m
Ends: 4.00" / 102 mm 190.00 ft / 57.91 m 16.00 ft / 4.88 m
Main Belt covers 103 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 390.00 ft / 118.87 m 26.00 ft / 7.92 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 7.00" / 178 mm 5.00" / 127 mm 7.00" / 178 mm
2nd: 4.00" / 102 mm 3.00" / 76 mm 4.00" / 102 mm
- Armour deck: 2.00" / 51 mm
Machinery:
Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 50,216 shp / 37,461 Kw = 25.00 kts
Range 5,600nm at 15.00 kts
Bunker at max displacement = 3,668 tons (100% coal)
Complement:
807 - 1,050
Cost:
£1.564 million / $6.256 million
Distribution of weights at normal displacement:
Armament: 1,353 tons, 7.1 %
Armour: 5,293 tons, 27.9 %
- Belts: 2,050 tons, 10.8 %
- Torpedo bulkhead: 750 tons, 4.0 %
- Armament: 1,295 tons, 6.8 %
- Armour Deck: 1,198 tons, 6.3 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,128 tons, 11.2 %
Hull, fittings & equipment: 7,903 tons, 41.7 %
Fuel, ammunition & stores: 2,800 tons, 14.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
32,782 lbs / 14,870 Kg = 37.9 x 12.0 " / 305 mm shells or 5.2 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 4.9 ft / 1.5 m
Roll period: 15.2 seconds
Steadiness - As gun platform (Average = 50 %): 67 %
- Recoil effect (Restricted arc if above 1.00): 0.89
Seaboat quality (Average = 1.00): 1.68
Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.550 / 0.559
Length to Beam Ratio: 7.25 : 1
'Natural speed' for length: 24.08 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 30.00 ft / 9.14 m, 26.00 ft / 7.92 m
- Forward deck: 30.00 %, 26.00 ft / 7.92 m, 25.00 ft / 7.62 m
- Aft deck: 35.00 %, 25.00 ft / 7.62 m, 25.00 ft / 7.62 m
- Quarter deck: 15.00 %, 25.00 ft / 7.62 m, 26.00 ft / 7.92 m
- Average freeboard: 25.75 ft / 7.85 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93.4 %
- Above water (accommodation/working, high = better): 192.8 %
Waterplane Area: 32,382 Square feet or 3,008 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 156 lbs/sq ft or 762 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.25
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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