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- HMS Bumpirate, United Kingdom Dreadnought laid down 1913
- Displacement:
- 29,093 t light; 31,475 t standard; 35,843 t normal; 39,337 t full load
- Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
- (654.65 ft / 623.36 ft) x 92.52 ft x (32.81 / 35.54 ft)
- (199.54 m / 190.00 m) x 28.20 m x (10.00 / 10.83 m)
- Armament:
- 10 - 15.28" / 388 mm 45.0 cal guns - 1,797.43lbs / 815.30kg shells, 150 per gun
- Breech loading guns in turret on barbette mounts, 1913 Model
- 4 x Twin mounts on centreline ends, evenly spread
- 2 raised mounts - superfiring
- 1 x Single mount layout not set
- 1 raised mount
- 16 - 6.22" / 158 mm 45.0 cal guns - 121.36lbs / 55.05kg shells, 150 per gun
- Breech loading guns in turret on barbette mounts, 1913 Model
- 5 x 2-gun mounts on centreline, evenly spread
- 2 raised mounts
- 3 x Single mounts on side ends, majority forward
- 2 raised mounts - superfiring
- 4 - 2.83" / 72.0 mm 45.0 cal guns - 11.49lbs / 5.21kg shells, 150 per gun
- Breech loading guns in deck mounts, 1913 Model
- 2 x Single mounts on sides, forward deck forward
- 8 - 1.65" / 42.0 mm 45.0 cal guns - 2.27lbs / 1.03kg shells, 150 per gun
- Quick firing guns in open barbette mounts, 1913 Model
- 2 x Single mounts on centreline, forward deck forward
- Weight of broadside 19,980 lbs / 9,063 kg
- Main Torpedoes
- 4 - 21.7" / 552 mm, 19.69 ft / 6.00 m torpedoes - 1.339 t each, 5.355 t total
- submerged bow tubes
- Armour:
- - Belts: Width (max) Length (avg) Height (avg)
- Main: 12.0" / 305 mm 355.32 ft / 108.30 m 11.45 ft / 3.49 m
- Ends: 7.87" / 200 mm 268.01 ft / 81.69 m 11.45 ft / 3.49 m
- Upper: 2.40" / 61 mm 355.32 ft / 108.30 m 8.01 ft / 2.44 m
- Main Belt covers 88 % of normal length
- Main Belt inclined 12.00 degrees (positive = in)
- - Hull void:
- 1.22" / 31 mm 49.21 ft / 15.00 m 6.56 ft / 2.00 m
- - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
- Main: 9.84" / 250 mm 9.45" / 240 mm 9.45" / 240 mm
- 2nd: 4.80" / 122 mm 5.20" / 132 mm 3.23" / 82 mm
- 3rd: 2.83" / 72 mm 2.76" / 70 mm -
- 4th: - - 1.26" / 32 mm
- - Armoured deck - multiple decks:
- For and Aft decks: 6.10" / 155 mm
- Forecastle: 6.10" / 155 mm Quarter deck: 2.91" / 74 mm
- - Conning towers: Forward 3.94" / 100 mm, Aft 4.72" / 120 mm
- Machinery:
- Coal fired boilers, steam turbines,
- Direct drive, 6 shafts, 38,684 shp / 28,858 Kw = 21.00 kts
- Range 16,000nm at 11.00 kts
- Bunker at max displacement = 7,862 tons (100% coal)
- Complement:
- 1,302 - 1,693
- Cost:
- £3.398 million / $13.590 million
- Distribution of weights at normal displacement:
- Armament: 3,673 tons, 10.2 %
- - Guns: 3,662 tons, 10.2 %
- - Weapons: 11 tons, 0.0 %
- Armour: 12,135 tons, 33.9 %
- - Belts: 3,395 tons, 9.5 %
- - Void: 15 tons, 0.0 %
- - Armament: 3,701 tons, 10.3 %
- - Armour Deck: 4,822 tons, 13.5 %
- - Conning Towers: 203 tons, 0.6 %
- Machinery: 1,667 tons, 4.7 %
- Hull, fittings & equipment: 11,629 tons, 32.4 %
- Fuel, ammunition & stores: 6,750 tons, 18.8 %
- Miscellaneous weights: 0 tons, 0.0 %
- Overall survivability and seakeeping ability:
- Survivability (Non-critical penetrating hits needed to sink ship):
- 49,089 lbs / 22,267 Kg = 27.5 x 15.3 " / 388 mm shells or 4.3 torpedoes
- Stability (Unstable if below 1.00): 1.11
- Metacentric height 5.4 ft / 1.6 m
- Roll period: 16.7 seconds
- Steadiness - As gun platform (Average = 50 %): 44 %
- - Recoil effect (Restricted arc if above 1.00): 0.99
- Seaboat quality (Average = 1.00): 1.21
- Hull form characteristics:
- Hull has a flush deck,
- a normal bow and a round stern
- Block coefficient (normal/deep): 0.663 / 0.672
- Length to Beam Ratio: 6.74 : 1
- 'Natural speed' for length: 24.97 kts
- Power going to wave formation at top speed: 43 %
- Trim (Max stability = 0, Max steadiness = 100): 32
- Bow angle (Positive = bow angles forward): 42.00 degrees
- Stern overhang: 6.56 ft / 2.00 m
- Freeboard (% = length of deck as a percentage of waterline length):
- Fore end, Aft end
- - Forecastle: 28.00 %, 27.46 ft / 8.37 m, 22.47 ft / 6.85 m
- - Forward deck: 32.00 %, 22.47 ft / 6.85 m, 17.49 ft / 5.33 m
- - Aft deck: 25.00 %, 17.49 ft / 5.33 m, 17.49 ft / 5.33 m
- - Quarter deck: 15.00 %, 17.49 ft / 5.33 m, 17.49 ft / 5.33 m
- - Average freeboard: 20.24 ft / 6.17 m
- Ship space, strength and comments:
- Space - Hull below water (magazines/engines, low = better): 64.3 %
- - Above water (accommodation/working, high = better): 123.5 %
- Waterplane Area: 44,709 Square feet or 4,154 Square metres
- Displacement factor (Displacement / loading): 108 %
- Structure weight / hull surface area: 205 lbs/sq ft or 1,000 Kg/sq metre
- Hull strength (Relative):
- - Cross-sectional: 0.95
- - Longitudinal: 1.61
- - Overall: 1.00
- Excellent machinery, storage, compartmentation space
- Excellent accommodation and workspace room
- Good seaboat, rides out heavy weather easily
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