GB/FG/1913, Great Britain Frigate-Gunboat laid down 1913 (Engine 1927) Displacement: 1,035 t light; 1,076 t standard; 1,200 t normal; 1,300 t full load Dimensions: Length overall / water x beam x draught 315.77 ft / 315.00 ft x 30.00 ft x 10.00 ft (normal load) 96.25 m / 96.01 m x 9.14 m x 3.05 m Armament: 4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1913 Model Breech loading guns in deck mounts with hoists on centreline ends, evenly spread, 2 raised mounts - superfiring 1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1913 Model Quick firing gun in a deck mount with hoist on centreline amidships Weight of broadside 160 lbs / 73 kg Shells per gun, main battery: 180 2 - 21.0" / 533.4 mm above water torpedoes Machinery: Oil fired boilers, steam turbines, Direct drive, 2 shafts, 29,475 shp / 21,988 Kw = 32.00 kts Range 3,250nm at 15.00 kts Bunker at max displacement = 224 tons Complement: 101 - 132 Cost: £0.153 million / $0.614 million Distribution of weights at normal displacement: Armament: 20 tons, 1.7 % Machinery: 626 tons, 52.2 % Hull, fittings & equipment: 389 tons, 32.4 % Fuel, ammunition & stores: 165 tons, 13.8 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 347 lbs / 157 Kg = 10.8 x 4.0 " / 102 mm shells or 0.2 torpedoes Stability (Unstable if below 1.00): 1.34 Metacentric height 1.4 ft / 0.4 m Roll period: 10.7 seconds Steadiness - As gun platform (Average = 50 %): 63 % - Recoil effect (Restricted arc if above 1.00): 0.47 Seaboat quality (Average = 1.00): 1.26 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.444 Length to Beam Ratio: 10.50 : 1 'Natural speed' for length: 17.75 kts Power going to wave formation at top speed: 68 % 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: 22.00 ft / 6.71 m - Forecastle (20 %): 20.00 ft / 6.10 m - Mid (42 %): 20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break) - Quarterdeck (15 %): 12.00 ft / 3.66 m - Stern: 12.00 ft / 3.66 m - Average freeboard: 15.52 ft / 4.73 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 181.5 % - Above water (accommodation/working, high = better): 142.2 % Waterplane Area: 6,001 Square feet or 557 Square metres Displacement factor (Displacement / loading): 59 % Structure weight / hull surface area: 28 lbs/sq ft or 138 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.44 - Longitudinal: 3.00 - Overall: 0.53 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Tuesday, August 02, 2005
Another recalculation of the GB/FG/1913
My friend Cliff wanted to build a destroyer-type ship that was primarily gun-armed, with a minimal torpedo armament. He wanted to give it a distinctive designation, it became an FG. This was rather like a later-Marksman class leader with superfiring guns. This is the Springsharp report:
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