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Gunfire Support ships

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Michael Garrity	Gunfire Support ships	Lead	[-]
Registered Member Posts: 15 (20-Apr-2008 20:04:29) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Ahoy, there: I have adapted a couple of my battleship designs to serve as gunfire support vessels. Here's the first: USS Warwick, United States Gunfire Support ship laid down 1950 Displacement: 80,617 t light; 86,481 t standard; 98,349 t normal; 107,844 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (976.20 ft / 950.00 ft) x 135.00 ft x (40.00 / 43.18 ft) (297.55 m / 289.56 m) x 41.15 m x (12.19 / 13.16 m) Armament: 12 - 16.00" / 406 mm 50.0 cal guns - 2,700.00lbs / 1,224.70kg shells, 175 per gun Breech loading guns in turret on barbette mounts, 1950 Model, 4 x 3-gun mounts on centreline ends, evenly spread, 2 raised mounts - superfiring 20 - 5.00" / 127 mm 54.0 cal guns - 67.23lbs / 30.50kg shells, 1,000 per gun, Auto rapid fire guns in turret on barbette mounts, 1950 Model, 10 x Twin mounts on sides, evenly spread Weight of broadside 33,745 lbs / 15,306 kg Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 16.0" / 406 mm 617.50 ft / 188.21 m 13.94 ft / 4.25 m Ends: Unarmoured Upper: 10.0" / 254 mm 617.50 ft / 188.21 m 8.00 ft / 2.44 m Main Belt covers 100 % of normal length - Torpedo Bulkhead: 6.00" / 152 mm 617.50 ft / 188.21 m 38.61 ft / 11.77 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 18.0" / 457 mm 10.0" / 254 mm 16.0" / 406 mm 2nd: 5.00" / 127 mm 3.00" / 76 mm 4.00" / 102 mm - Armoured deck - multiple decks: 4.00" / 102 mm For and Aft decks - Conning towers: Forward 20.00" / 508 mm, Aft 0.00" / 0 mm Machinery: Diesel Internal combustion generators, Electric motors, 4 shafts, 281,110 shp / 209,708 Kw = 32.00 kts Range 20,000nm at 17.00 kts Bunker at max displacement = 21,363 tons Complement: 2,776 - 3,609 Cost: £51.687 million / $206.749 million Distribution of weights at normal displacement: Armament: 6,208 tons, 6.3 %, Armour: 29,433 tons, 29.9 %, - Belts: 8,170 tons, 8.3 % - Torpedo bulkhead: 5,293 tons, 5.4 % - Armament: 8,738 tons, 8.9 % - Armour Deck: 6,314 tons, 6.4 % - Conning Tower: 918 tons, 0.9 % Machinery: 6,725 tons, 6.8 %, Hull, fittings & equipment: 34,251 tons, 34.8 % Fuel, ammunition & stores: 17,732 tons, 18.0 % Miscellaneous weights: 4,000 tons, 4.1 % - Hull below water: 2,500 tons - Hull above water: 1,000 tons - On freeboard deck: 500 tons Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 208,862 lbs / 94,738 Kg = 102.0 x 16.0 " / 406 mm shells or 45.7 torpedoes Stability (Unstable if below 1.00): 1.13 Metacentric height 9.9 ft / 3.0 m Roll period: 18.0 seconds Steadiness - As gun platform (Average = 50 %): 79 % - Recoil effect (Restricted arc if above 1.00): 0.91 Seaboat quality (Average = 1.00): 1.58 Hull form characteristics: Hull has a flush deck, a normal bow and large transom stern Block coefficient (normal/deep): 0.671 / 0.682 Length to Beam Ratio: 7.04 : 1 'Natural speed' for length: 35.54 kts Power going to wave formation at top speed: 54 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 20.00 degrees Stern overhang: 8.00 ft / 2.44 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 20.00 %, 50.00 ft / 15.24 m, 40.00 ft / 12.19 m - Forward deck: 30.00 %, 40.00 ft / 12.19 m, 40.00 ft / 12.19 m - Aft deck: 35.00 %, 40.00 ft / 12.19 m, 40.00 ft / 12.19 m - Quarter deck: 15.00 %, 40.00 ft / 12.19 m, 40.00 ft / 12.19 m - Average freeboard: 40.80 ft / 12.44 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 65.1 % - Above water (accommodation/working, high = better): 286.9 % Waterplane Area: 104,525 Square feet or 9,711 Square metres Displacement factor (Displacement / loading): 133 % Structure weight / hull surface area: 250 lbs/sq ft or 1,219 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.93 - Longitudinal: 1.94 - Overall: 1.00 Hull space for machinery, storage, compartmentation is excellent Room for accommodation and workspaces is excellent Ship has slow, easy roll, a good, steady gun platform Excellent seaboat, comfortable, can fire her guns in the heaviest weather Comments?
Michael Garrity		#1	[-]
Registered Member Posts: 16 (20-Apr-2008 20:09:22) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	Ahoy: This next design is the Warwick's much bigger brother: USS Central Falls, United States Gunfire Support vessel laid down 1950 Displacement: 199,163 t light; 212,168 t standard; 236,902 t normal; 256,690 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (1,428.02 ft / 1,400.00 ft) x 160.00 ft x (56.00 / 59.83 ft) (435.26 m / 426.72 m) x 48.77 m x (17.07 / 18.24 m) Armament: 12 - 20.00" / 508 mm 50.0 cal guns - 5,200.00lbs / 2,358.68kg shells, 200 per gun, Breech-loading guns in turret on barbette mounts, 1950 Model, 4 x 3-gun mounts on centreline ends, evenly spread, 2 raised mounts - superfiring 20 - 6.10" / 155 mm 47.0 cal guns - 120.00lbs / 54.43kg shells, 1,000 per gun, Auto rapid-fire guns in turret on barbette mounts, 1950 Model, 10 x 2-gun mounts on sides, evenly spread, 4 raised mounts Weight of broadside 64,800 lbs / 29,393 kg Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 36.0" / 914 mm 840.00 ft / 256.03 m 15.18 ft / 4.63 m Ends: Unarmoured Upper: 17.0" / 432 mm 840.00 ft / 256.03 m 8.00 ft / 2.44 m Main Belt covers 92 % of normal length - Torpedo Bulkhead: 8.00" / 203 mm 840.00 ft / 256.03 m 53.93 ft / 16.44 m - Hull Bulges: 8.00" / 203 mm 825.00 ft / 251.46 m 42.00 ft / 12.80 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 34.0" / 864 mm 17.0" / 432 mm 22.0" / 559 mm 2nd: 6.00" / 152 mm 3.00" / 76 mm 5.00" / 127 mm - Armoured deck - multiple decks: 12.00" / 305 mm For and Aft decks - Conning towers: Forward 36.00" / 914 mm, Aft 0.00" / 0 mm Machinery: Diesel Internal combustion generators, Electric motors, 6 shafts, 342,823 shp / 255,746 Kw = 30.00 kts Range 25,000nm at 17.00 kts Bunker at max displacement = 44,522 tons Complement: 5,368 - 6,979 Cost: £106.412 million / $425.649 million Distribution of weights at normal displacement: Armament: 10,989 tons, 4.6 % Armour: 100,348 tons, 42.4 % - Belts: 24,598 tons, 10.4 % - Torpedo bulkhead: 13,409 tons, 5.7 % - Bulges: 10,256 tons, 4.3 % - Armament: 18,000 tons, 7.6 % - Armour Deck: 31,115 tons, 13.1 % - Conning Tower: 2,969 tons, 1.3 % Machinery: 8,202 tons, 3.5 % Hull, fittings & equipment: 73,124 tons, 30.9 % Fuel, ammunition & stores: 37,739 tons, 15.9 % Miscellaneous weights: 6,500 tons, 2.7 % - Hull below water: 3,500 tons - Hull above water: 1,500 tons - On freeboard deck: 1,000 tons - Above deck: 500 tons Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 631,995 lbs / 286,668 Kg = 158.0 x 20.0 " / 508 mm shells or 228.9 torpedoes Stability (Unstable if below 1.00): 1.09 Metacentric height 11.9 ft / 3.6 m Roll period: 19.4 seconds Steadiness - As gun platform (Average = 50 %): 83 % - Recoil effect (Restricted arc if above 1.00): 0.92 Seaboat quality (Average = 1.00): 1.85 Hull form characteristics: Hull has a flush deck, a normal bow and large transom stern Block coefficient (normal/deep): 0.661 / 0.670 Length to Beam Ratio: 8.75 : 1 'Natural speed' for length: 42.45 kts Power going to wave formation at top speed: 38 % Trim (Max stability = 0, Max steadiness = 100): 45 Bow angle (Positive = bow angles forward): 20.00 degrees Stern overhang: 8.00 ft / 2.44 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 20.00 %, 55.00 ft / 16.76 m, 43.00 ft / 13.11 m - Forward deck: 30.00 %, 43.00 ft / 13.11 m, 43.00 ft / 13.11 m - Aft deck: 30.00 %, 43.00 ft / 13.11 m, 43.00 ft / 13.11 m - Quarter deck: 20.00 %, 43.00 ft / 13.11 m, 43.00 ft / 13.11 m - Average freeboard: 43.96 ft / 13.40 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 43.3 % - Above water (accommodation/working, high = better): 276.0 % Waterplane Area: 180,874 Square feet or 16,804 Square metres Displacement factor (Displacement / loading): 135 % Structure weight / hull surface area: 297 lbs/sq ft or 1,450 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - Longitudinal: 1.27 - Overall: 1.00 Hull space for machinery, storage, compartmentation is excellent Room for accommodation and workspaces is excellent Ship has slow, easy roll, a good, steady gun platform Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Dave Bender	12 - 16.00" / 406 mm 50.0 cal guns	#2	[-]
Posts: 6441 (21-Apr-2008 01:57:35) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	155mm has been the most popular size for medium army howitzers for the past 100 years. That is the size you need for naval gunfire support of ground troops. Just mount standard army howitzers in high angle (60 degree) turrets. You also want helicopters for the artillery forward observers. Armor needs to be only 2 or 3 inches thick. You need protection against return fire from enemy howitzers ashore not against 16" naval rifles.
E F Draaijers		#3	[-]
Registered Member Posts: 184 (21-Apr-2008 22:28:08) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	I have to agree with Dave, since there is absolutely no need for such a heavy and dito very expensive armored vessel in the fifties. Any ship with guns, whatever the calliber can do the same job at much less costs. The combination of the Army 155 mm howitzer on a ship's hull is prommising, since the first is already quite abundent and the ships hull can be small and cheap with no armor of whatever sort. Even a middle sized landingship can be addapted for the gun, making conversions on the numereous landingcraft an option too. Numbers are more importante than quality in such an approach and even up to 200 such gunvessels can be much cheaper than a single oversized dinosaur, with no reason to exist, since no enemy battleships existed and the ship still is vulnerable for air and submarine attacks, the more likely threath of the post WW2 period.
Dave Bender	Any ship with guns	#4	[-]
Posts: 6444 (21-Apr-2008 23:04:50) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts	In 1950 the U.S. Navy had zillions of Cleveland class cruisers in mothballs. After modification the 6"/47 QF main gun turrets were capable of 60 degree elevation. What more could you want for gunfire support? And they cost you nothing.

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