USS Olympia USN Scout Cruiser RFP 1917

Olympia, USA Heavy Scout Cruiser  laid down 1918

Displacement:
	6,572 t light; 6,928 t standard; 7,500 t normal; 7,957 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(576.26 ft / 549.87 ft) x 55.77 ft x (13.48 / 14.18 ft)
	(175.64 m / 167.60 m) x 17.00 m  x (4.11 / 4.32 m)

Armament:
      4 - 9.00" / 229 mm 98.0 cal guns - 427.08lbs / 193.72kg shells, 150 per gun
	  Breech loading guns in deck and hoist mounts, 1918 Model
	  4 x Single mounts on centreline, evenly spread
      10 - 5.00" / 127 mm 25.0 cal guns - 56.77lbs / 25.75kg shells, 150 per gun
	  Breech loading guns in deck mounts, 1918 Model
	  10 x Single mounts on sides, evenly spread
      12 - 2.99" / 76.0 mm 50.0 cal guns - 14.18lbs / 6.43kg shells, 150 per gun
	  Breech loading guns in deck mounts, 1918 Model
	  12 x Single mounts on sides, evenly spread
      25 - 1.46" / 37.0 mm 30.0 cal guns - 1.42lbs / 0.65kg shells, 150 per gun
	  Breech loading guns in deck mounts, 1918 Model
	  25 x Single mounts on sides, evenly spread
      Weight of broadside 2,482 lbs / 1,126 kg
      Main Torpedoes
      2 - 21.0" / 533 mm, 21.36 ft / 6.51 m torpedoes - 1.369 t each, 2.739 t total
	In 2 sets of deck mounted side rotating tubes
      Mines
      45 - 120.00 lbs / 54.43 kg mines - 2.411 t total

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	2.99" / 76 mm	511.15 ft / 155.80 m	8.92 ft / 2.72 m
	Ends:	Unarmoured
	Upper:	1.46" / 37 mm	511.15 ft / 155.80 m	8.01 ft / 2.44 m
	  Main Belt covers 143 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		0.39" / 10 mm	511.15 ft / 155.80 m	12.01 ft / 3.66 m
	Beam between torpedo bulkheads 55.77 ft / 17.00 m

   - Hull void:
		0.39" / 10 mm	511.15 ft / 155.80 m	12.01 ft / 3.66 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	0.98" / 25 mm	0.98" / 25 mm		0.98" / 25 mm
	2nd:	0.39" / 10 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 0.98" / 25 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 2.24" / 57 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 6 shafts, 53,025 shp / 39,557 Kw = 29.00 kts
	Range 10,000nm at 10.00 kts
	Bunker at max displacement = 1,029 tons

Complement:
	402 - 523

Cost:
	£1.744 million / $6.977 million

Distribution of weights at normal displacement:
	Armament: 1,060 tons, 14.1 %
	   - Guns: 1,050 tons, 14.0 %
	   - Weapons: 10 tons, 0.1 %
	Armour: 1,441 tons, 19.2 %
	   - Belts: 764 tons, 10.2 %
	   - Torpedo bulkhead: 89 tons, 1.2 %
	   - Void: 89 tons, 1.5 %
	   - Armament: 54 tons, 0.7 %
	   - Armour Deck: 425 tons, 5.7 %
	   - Conning Tower: 19 tons, 0.2 %
	Machinery: 1,913 tons, 25.5 %
	Hull, fittings & equipment: 2,008 tons, 26.8 %
	Fuel, ammunition & stores: 928 tons, 12.4 %
	Miscellaneous weights: 150 tons, 2.0 %
	   - On freeboard deck: 60 tons
	   - Above deck: 90 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  5,219 lbs / 2,367 Kg = 14.3 x 9.0 " / 229 mm shells or 1.0 torpedoes
	Stability (Unstable if below 1.00): 1.18
	Metacentric height 2.8 ft / 0.9 m
	Roll period: 13.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.66
	Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
	Hull has a flush deck,
	  a straight bulbous bow and a cruiser stern
	Block coefficient (normal/deep): 0.635 / 0.641
	Length to Beam Ratio: 9.86 : 1
	'Natural speed' for length: 23.45 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 34.00 degrees
	Stern overhang: 9.00 ft / 2.74 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	20.00 %,  25.79 ft / 7.86 m,  21.10 ft / 6.43 m
	   - Forward deck:	30.00 %,  21.10 ft / 6.43 m,  16.40 ft / 5.00 m
	   - Aft deck:	35.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
	   - Quarter deck:	15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
	   - Average freeboard:		18.42 ft / 5.61 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 126.9 %
		- Above water (accommodation/working, high = better): 188.8 %
	Waterplane Area: 23,167 Square feet or 2,152 Square metres
	Displacement factor (Displacement / loading): 84 %
	Structure weight / hull surface area: 80 lbs/sq ft or 391 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.80
		- Longitudinal: 0.89
		- Overall: 0.81
	Caution: Hull subject to strain in open-sea
	Cramped machinery, storage, compartmentation space
	Excellent accommodation and workspace room