GB/CL/1925, Great Britain Light Cruiser laid down 1927 (Engine 1950)
Displacement:
6,102 t light; 6,318 t standard; 6,720 t normal; 7,042 t full load
Dimensions: Length overall / water x beam x draught
555.36 ft / 550.00 ft x 52.00 ft x 21.00 ft (normal load)
169.27 m / 167.64 m x 15.85 m x 6.40 m
Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1927 Model
Dual purpose guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1927 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (8x2 guns), 1.95lbs / 0.89kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 6 raised mounts
Weight of broadside 940 lbs / 427 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.00" / 25 mm 530.00 ft / 161.54 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 148 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.75" / 19 mm 0.75" / 19 mm
- Armour deck: 0.75" / 19 mm, Conning tower: 1.00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 103,563 shp / 77,258 Kw = 36.00 kts
Range 4,500nm at 15.00 kts
Bunker at max displacement = 724 tons
Complement:
370 - 482
Cost:
£2.397 million / $9.588 million
Distribution of weights at normal displacement:
Armament: 118 tons, 1.7 %
Armour: 521 tons, 7.8 %
- Belts: 205 tons, 3.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 65 tons, 1.0 %
- Armour Deck: 243 tons, 3.6 %
- Conning Tower: 8 tons, 0.1 %
Machinery: 2,478 tons, 36.9 %
Hull, fittings & equipment: 2,986 tons, 44.4 %
Fuel, ammunition & stores: 618 tons, 9.2 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,931 lbs / 2,237 Kg = 45.7 x 6.0 " / 152 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 2.7 ft / 0.8 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.10
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.392
Length to Beam Ratio: 10.58 : 1
'Natural speed' for length: 23.45 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.00 ft / 8.23 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (37 %): 24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
- Quarterdeck (15 %): 16.00 ft / 4.88 m
- Stern: 16.00 ft / 4.88 m
- Average freeboard: 19.20 ft / 5.85 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 133.0 %
- Above water (accommodation/working, high = better): 147.5 %
Waterplane Area: 17,527 Square feet or 1,628 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 93 lbs/sq ft or 455 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
Friday, November 18, 2005
A better protected GB/CL/1927
I failed at achieving 36.5 knots, but I was able to add more protection, partly by reducing some, so that I could have a 1in belt that covers a good bit of side. The range is less, but this seemed to be an improvement. Adding the belt improved seakeeping! This is the Springsharp report:
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