1918 USS Savannah

Savannah, USA Light Cruiser laid down 1918

Displacement:
	6,625 t light; 6,989 t standard; 7,500 t normal; 7,909 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(532.45 ft / 520.00 ft) x 54.00 ft x (22.00 / 22.80 ft)
	(162.29 m / 158.50 m) x 16.46 m  x (6.71 / 6.95 m)

Armament:
      6 - 6.00" / 152 mm 53.0 cal guns - 105.01lbs / 47.63kg shells, 200 per gun
	  Breech loading guns in deck and hoist mounts, 1920 Model
	  4 x Single mounts on centreline, evenly spread
		2 raised mounts
	  2 x Single mounts on sides amidships
		2 double raised mounts
      24 - 5.00" / 127 mm 25.0 cal guns - 53.99lbs / 24.49kg shells, 200 per gun
	  Dual purpose guns in deck and hoist mounts, 1921 Model
	  20 x Single mounts on sides, evenly spread
		8 raised mounts
	  4 x Single mounts on sides, evenly spread
		4 double raised mounts
      Weight of broadside 1,926 lbs / 874 kg
      Main Torpedoes
      16 - 21.0" / 533 mm, 16.40 ft / 5.00 m torpedoes - 1.082 t each, 17.311 t total
	In 4 sets of deck mounted side rotating tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	3.50" / 89 mm	416.00 ft / 126.80 m	11.00 ft / 3.35 m
	Ends:	Unarmoured
	  Main Belt covers 123 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.00" / 25 mm	520.00 ft / 158.50 m	21.00 ft / 6.40 m
	Beam between torpedo bulkheads 52.50 ft / 16.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	4.00" / 102 mm	0.13" / 3 mm		3.00" / 76 mm
	2nd:	0.13" / 3 mm	0.13" / 3 mm		0.50" / 13 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 1.50" / 38 mm

   - Conning towers: Forward 3.00" / 76 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Electric motors, 4 shafts, 64,021 shp / 47,760 Kw = 31.70 kts
	Range 9,000nm at 10.00 kts
	Bunker at max displacement = 921 tons

Complement:
	402 - 523

Cost:
	£1.409 million / $5.637 million

Distribution of weights at normal displacement:
	Armament: 469 tons, 6.3 %
	   - Guns: 435 tons, 5.8 %
	   - Weapons: 35 tons, 0.5 %
	Armour: 1,581 tons, 21.1 %
	   - Belts: 636 tons, 8.5 %
	   - Torpedo bulkhead: 404 tons, 5.4 %
	   - Armament: 56 tons, 0.7 %
	   - Armour Deck: 460 tons, 6.1 %
	   - Conning Tower: 25 tons, 0.3 %
	Machinery: 2,310 tons, 30.8 %
	Hull, fittings & equipment: 2,265 tons, 30.2 %
	Fuel, ammunition & stores: 875 tons, 11.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  6,035 lbs / 2,737 Kg = 55.9 x 6.0 " / 152 mm shells or 1.4 torpedoes
	Stability (Unstable if below 1.00): 1.21
	Metacentric height 2.8 ft / 0.9 m
	Roll period: 13.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 50 %
			- Recoil effect (Restricted arc if above 1.00): 0.73
	Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and small transom stern
	Block coefficient (normal/deep): 0.425 / 0.432
	Length to Beam Ratio: 9.63 : 1
	'Natural speed' for length: 24.65 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 20.00 degrees
	Stern overhang: 3.00 ft / 0.91 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	10.00 %,  25.95 ft / 7.91 m,  21.00 ft / 6.40 m
	   - Forward deck:	30.00 %,  21.00 ft / 6.40 m,  15.00 ft / 4.57 m
	   - Aft deck:	50.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
	   - Quarter deck:	10.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
	   - Average freeboard:		16.70 ft / 5.09 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 123.0 %
		- Above water (accommodation/working, high = better): 134.7 %
	Waterplane Area: 17,970 Square feet or 1,670 Square metres
	Displacement factor (Displacement / loading): 98 %
	Structure weight / hull surface area: 98 lbs/sq ft or 480 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.62
		- Overall: 1.00
	Cramped machinery, storage, compartmentation space
	Excellent accommodation and workspace room

6"/53 Mark 12 - range 23,130m
5"/25 Mark 10 - range 13,259m
21" Mark 9 Torpedo - range 8230m, 95kg TNT
to be replaced by
21" Mark 11 Torpedo - range 13,700m, 227kg TNT