HMS Unapproachable, Great Britain Armoured Cruiser laid down 1905 (Engine 1910)
Displacement:
14,696 t light; 15,454 t standard; 17,700 t normal; 19,497 t full load
Dimensions: Length overall / water x beam x draught
554.00 ft / 554.00 ft x 75.00 ft x 26.50 ft (normal load)
168.86 m / 168.86 m x 22.86 m x 8.08 m
Armament:
8 - 7.50" / 191 mm guns (4x2 guns), 210.94lbs / 95.68kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on side ends, evenly spread
4 - 9.20" / 234 mm guns (2x2 guns), 389.34lbs / 176.60kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
4 - 7.50" / 191 mm guns in single mounts, 210.94lbs / 95.68kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on side, evenly spread, all raised mounts
12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
Quick firing guns in deck mounts with hoists
on side, evenly spread, all raised mounts
Weight of broadside 4,473 lbs / 2,029 kg
Shells per gun, main battery: 150
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: Unarmoured
Main Belt covers 108 % of normal length
- Torpedo Bulkhead:
1.50" / 38 mm 390.00 ft / 118.87 m 26.00 ft / 7.92 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
2nd: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
3rd: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
4th: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm
Machinery:
Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 52,957 shp / 39,506 Kw = 25.50 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 4,043 tons (100% coal)
Complement:
766 - 997
Cost:
£1.321 million / $5.284 million
Distribution of weights at normal displacement:
Armament: 559 tons, 3.2 %
Armour: 5,258 tons, 29.7 %
- Belts: 1,584 tons, 8.9 %
- Torpedo bulkhead: 563 tons, 3.2 %
- Armament: 1,908 tons, 10.8 %
- Armour Deck: 1,086 tons, 6.1 %
- Conning Tower: 117 tons, 0.7 %
Machinery: 2,407 tons, 13.6 %
Hull, fittings & equipment: 6,472 tons, 36.6 %
Fuel, ammunition & stores: 3,004 tons, 17.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
25,021 lbs / 11,349 Kg = 118.6 x 7.5 " / 191 mm shells or 4.2 torpedoes
Stability (Unstable if below 1.00): 1.02
Metacentric height 3.4 ft / 1.0 m
Roll period: 17.2 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.19
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.563
Length to Beam Ratio: 7.39 : 1
'Natural speed' for length: 23.54 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -2.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (50 %): 20.00 ft / 6.10 m
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 20.16 ft / 6.14 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.7 %
- Above water (accommodation/working, high = better): 145.9 %
Waterplane Area: 29,343 Square feet or 2,726 Square metres
Displacement factor (Displacement / loading): 122 %
Structure weight / hull surface area: 145 lbs/sq ft or 708 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.62
- Overall: 1.02
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
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