OMWHA Test Ship RFP 1917

Omwha, USA Scout Cruiser  laid down 1917

Displacement:
	5,058 t light; 5,514 t standard; 6,026 t normal; 6,435 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(576.26 ft / 549.87 ft) x 55.45 ft x (13.48 / 14.18 ft)
	(175.64 m / 167.60 m) x 16.90 m  x (4.11 / 4.32 m)

Armament:
      4 - 9.00" / 229 mm 98.0 cal guns - 724.99lbs / 328.85kg shells, 150 per gun
	  Breech loading guns in deck and hoist mounts, 1917 Model
	  4 x Single mounts on centreline, evenly spread
      10 - 5.00" / 127 mm 25.0 cal guns - 80.01lbs / 36.29kg shells, 150 per gun
	  Breech loading guns in deck mounts, 1917 Model
	  10 x Single mounts on sides, evenly spread
      12 - 2.95" / 75.0 mm 50.0 cal guns - 24.01lbs / 10.89kg shells, 150 per gun
	  Breech loading guns in deck mounts, 1917 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, 1917 Model
	  25 x Single mounts on sides, evenly spread
      Weight of broadside 4,024 lbs / 1,825 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
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		0.39" / 10 mm	511.15 ft / 155.80 m	12.01 ft / 3.66 m
	Beam between torpedo bulkheads 55.45 ft / 16.90 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: 0.39" / 10 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.51" / 13 mm

   - Conning towers: Forward 5.98" / 152 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 6 shafts, 43,639 shp / 32,555 Kw = 29.00 kts
	Range 10,000nm at 10.00 kts
	Bunker at max displacement = 921 tons

Complement:
	341 - 444

Cost:
	£1.409 million / $5.636 million

Distribution of weights at normal displacement:
	Armament: 1,059 tons, 17.6 %
	   - Guns: 1,048 tons, 17.4 %
	   - Weapons: 10 tons, 0.2 %
	Armour: 1,209 tons, 20.1 %
	   - Belts: 759 tons, 12.6 %
	   - Torpedo bulkhead: 89 tons, 1.5 %
	   - Void: 89 tons, 1.5 %
	   - Armament: 54 tons, 0.9 %
	   - Armour Deck: 176 tons, 2.9 %
	   - Conning Tower: 43 tons, 0.7 %
	Machinery: 1,600 tons, 26.5 %
	Hull, fittings & equipment: 1,190 tons, 19.8 %
	Fuel, ammunition & stores: 968 tons, 16.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  2,125 lbs / 964 Kg = 5.8 x 9.0 " / 229 mm shells or 0.7 torpedoes
	Stability (Unstable if below 1.00): 1.24
	Metacentric height 3.1 ft / 0.9 m
	Roll period: 13.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 53 %
			- Recoil effect (Restricted arc if above 1.00): 0.99
	Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
	Hull has rise forward of midbreak,
	  a straight bulbous bow and a cruiser stern
	Block coefficient (normal/deep): 0.513 / 0.521
	Length to Beam Ratio: 9.92 : 1
	'Natural speed' for length: 23.45 kts
	Power going to wave formation at top speed: 52 %
	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,  21.10 ft / 6.43 m
	   - Aft deck:	35.00 %,  10.56 ft / 3.22 m,  10.56 ft / 3.22 m
	   - Quarter deck:	15.00 %,  10.56 ft / 3.22 m,  10.56 ft / 3.22 m
	   - Average freeboard:		16.21 ft / 4.94 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 143.1 %
		- Above water (accommodation/working, high = better): 173.9 %
	Waterplane Area: 20,557 Square feet or 1,910 Square metres
	Displacement factor (Displacement / loading): 76 %
	Structure weight / hull surface area: 60 lbs/sq ft or 294 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.51
		- Longitudinal: 0.60
		- Overall: 0.52
	Caution: Hull subject to strain in open-sea
	Cramped machinery, storage, compartmentation space
	Excellent accommodation and workspace room

Warning: Beam between bulkheads too wide