GB/CL/1927 Unarmored, Great Britain Unarmored Cruiser laid down 1927 Displacement: 5,260 t light; 5,488 t standard; 6,244 t normal; 6,850 t full load Dimensions: Length overall / water x beam x draught 512.94 ft / 512.00 ft x 51.00 ft x 18.00 ft (normal load) 156.35 m / 156.06 m x 15.54 m x 5.49 m Armament: 10 - 5.10" / 130 mm guns (5x2 guns), 66.33lbs / 30.08kg shells, 1927 Model Dual purpose guns in deck mounts with hoists on centreline ends, majority forward, all raised mounts - superfiring 24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1927 Model Anti-aircraft guns in deck mounts on side ends, evenly spread, all raised mounts - superfiring Weight of broadside 710 lbs / 322 kg Shells per gun, main battery: 250 8 - 21.0" / 533.4 mm above water torpedoes Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 81,222 shp / 60,592 Kw = 35.00 kts Range 8,000nm at 15.00 kts Bunker at max displacement = 1,362 tons Complement: 350 - 456 Cost: £2.246 million / $8.983 million Distribution of weights at normal displacement: Armament: 89 tons, 1.4 % Machinery: 2,564 tons, 41.1 % Hull, fittings & equipment: 2,608 tons, 41.8 % Fuel, ammunition & stores: 984 tons, 15.8 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 4,380 lbs / 1,987 Kg = 66.0 x 5.1 " / 130 mm shells or 0.8 torpedoes Stability (Unstable if below 1.00): 1.36 Metacentric height 3.1 ft / 1.0 m Roll period: 12.1 seconds Steadiness - As gun platform (Average = 50 %): 52 % - Recoil effect (Restricted arc if above 1.00): 0.33 Seaboat quality (Average = 1.00): 1.05 Hull form characteristics: Hull has a flush deck and transom stern Block coefficient: 0.465 Length to Beam Ratio: 10.04 : 1 'Natural speed' for length: 25.92 kts Power going to wave formation at top speed: 63 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 2.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 27.00 ft / 8.23 m - Forecastle (20 %): 19.00 ft / 5.79 m - Mid (50 %): 19.00 ft / 5.79 m - Quarterdeck (15 %): 19.00 ft / 5.79 m - Stern: 19.00 ft / 5.79 m - Average freeboard: 19.64 ft / 5.99 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 144.6 % - Above water (accommodation/working, high = better): 143.0 % Waterplane Area: 17,526 Square feet or 1,628 Square metres Displacement factor (Displacement / loading): 107 % Structure weight / hull surface area: 85 lbs/sq ft or 416 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.92 - Longitudinal: 2.11 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Wednesday, January 26, 2005
An unarmored cruiser (GB/CL/1927 Unarmored)
I thought that the other missing piece was an unarmored cruiser to go with the rest of my British cruiser family for 1927. The odd thing about this ship is that it is fast, like a destroyer (35 knots). Not having armor almost is a mandate for having speed. The armament is destroyer-like or A/A cruiser-like, being 10-5.1in DP guns with 24-40mm AA. I am interested in the 5.1in gun. The British almost adopted the caliber, and then backed off, as they were concerned about the shot weight. A cruiser should overcome that objection, as the ship is much more substantial. I also included 8-21in TT. The only negative is that due to the speed, the space below decks is cramped.
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