CRNS Embra 460mm Design

CRNS Embra, Calder Republic Battleship laid down 1936 (Engine 1938)

Displacement:
	61,577 t light; 65,000 t standard; 68,868 t normal; 71,963 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(909.59 ft / 881.56 ft) x 113.85 ft x (37.07 / 38.43 ft)
	(277.24 m / 268.70 m) x 34.70 m  x (11.30 / 11.71 m)

Armament:
      9 - 18.11" / 460 mm 45.0 cal guns - 3,328.98lbs / 1,510.00kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1932 Model
	  2 x 3-gun mounts on centreline, forward evenly spread
		1 raised mount
	  1 x 3-gun mount on centreline, aft deck aft
      20 - 5.12" / 130 mm 38.0 cal guns - 58.00lbs / 26.31kg shells, 500 per gun
	  Dual purpose guns in deck and hoist mounts, 1932 Model
	  8 x 2-gun mounts on sides, evenly spread
		4 raised mounts
	  2 x 2-gun mounts on centreline ends, evenly spread
		2 double raised mounts
      32 - 1.46" / 37.0 mm 70.0 cal guns - 1.61lbs / 0.73kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1928 Model
	  16 x Twin mounts on sides, evenly spread
		4 raised mounts
      12 - 0.50" / 12.7 mm 130.0 cal guns - 0.08lbs / 0.04kg shells, 3,000 per gun
	  Anti-air guns in deck mounts, 1930 Model
	  12 x Single mounts on sides, evenly spread
      Weight of broadside 31,173 lbs / 14,140 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.5" / 342 mm	535.27 ft / 163.15 m	21.33 ft / 6.50 m
	Ends:	6.69" / 170 mm	138.52 ft / 42.22 m	13.12 ft / 4.00 m
	  207.78 ft / 63.33 m Unarmoured ends
	  Main Belt covers 93 % of normal length
	  Main Belt inclined -19.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		2.95" / 75 mm	535.27 ft / 163.15 m	26.25 ft / 8.00 m
	Beam between torpedo bulkheads 81.04 ft / 24.70 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	20.9" / 530 mm	8.66" / 220 mm		14.2" / 361 mm
	2nd:	2.95" / 75 mm	1.97" / 50 mm		3.94" / 100 mm
	3rd:	0.50" / 13 mm	0.50" / 13 mm		      -
	4th:	0.51" / 13 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 9.22" / 234 mm
	Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 14.96" / 380 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Electric motors, 4 shafts, 238,530 shp / 177,943 Kw = 32.40 kts
	Range 9,000nm at 15.00 kts
	Bunker at max displacement = 6,963 tons

Complement:
	2,125 - 2,763

Cost:
	£30.001 million / $120.003 million

Distribution of weights at normal displacement:
	Armament: 5,375 tons, 7.8 %
	   - Guns: 5,375 tons, 7.8 %
	Armour: 25,376 tons, 36.8 %
	   - Belts: 7,140 tons, 10.4 %
	   - Torpedo bulkhead: 1,535 tons, 2.2 %
	   - Armament: 4,841 tons, 7.0 %
	   - Armour Deck: 11,318 tons, 16.4 %
	   - Conning Tower: 542 tons, 0.8 %
	Machinery: 6,531 tons, 9.5 %
	Hull, fittings & equipment: 23,806 tons, 34.6 %
	Fuel, ammunition & stores: 7,291 tons, 10.6 %
	Miscellaneous weights: 488 tons, 0.7 %
	   - On freeboard deck: 409 tons
	   - Above deck: 79 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  101,149 lbs / 45,880 Kg = 34.1 x 18.1 " / 460 mm shells or 14.7 torpedoes
	Stability (Unstable if below 1.00): 1.09
	Metacentric height 7.2 ft / 2.2 m
	Roll period: 17.8 seconds
	Steadiness	- As gun platform (Average = 50 %): 52 %
			- Recoil effect (Restricted arc if above 1.00): 0.90
	Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
	Hull has a flush deck,
	  a straight bulbous bow and large transom stern
	Block coefficient (normal/deep): 0.648 / 0.653
	Length to Beam Ratio: 7.74 : 1
	'Natural speed' for length: 34.05 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 22.00 degrees
	Stern overhang: 13.45 ft / 4.10 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	19.64 %,  36.09 ft / 11.00 m,  24.93 ft / 7.60 m
	   - Forward deck:	38.00 %,  24.93 ft / 7.60 m,  26.90 ft / 8.20 m
	   - Aft deck:	22.72 %,  26.90 ft / 8.20 m,  27.23 ft / 8.30 m
	   - Quarter deck:	19.64 %,  27.23 ft / 8.30 m,  27.23 ft / 8.30 m
	   - Average freeboard:		27.12 ft / 8.27 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 93.3 %
		- Above water (accommodation/working, high = better): 189.1 %
	Waterplane Area: 80,061 Square feet or 7,438 Square metres
	Displacement factor (Displacement / loading): 108 %
	Structure weight / hull surface area: 235 lbs/sq ft or 1,147 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.40
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room

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Taper + Mixed Mags/Machinery
Machinery Length: 91.21m, Thickness: 395mm, Height: 4.5m
Magazine Length: 83.44m, Thickness: 405, Height: 4.5
Taper Thickness: 25mm
Taper Height: 2m
Average Thickness: 342.12mm
Average Height: 6.5m

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Taper Deck
Machinery Length: 91.21m, Thickness: 200mm
Magazine Length: 83.44m, Thickness: 215
Average Thickness 234.11mm

Bomb Deck = 40mm Calculated
Armor Deck = 190-175mm tapered Calculated + 25mm STS Structural
Splinter Deck = 15mm STS Structural

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Split Barbette
Height of Armor Deck in order: 4.5m, 4.5m, 4.5m
Height of Weather Deck in order: 7.6m, 8.2m, 8.3m
Superfactor: 0, 1, 0
Number of Guns: 3, 3, 3
Barbette Above: 405mm, 405mm, 405mm
Barbette Bellow: 320mm, 320mm, 320mm
Average Thickness: 358.10mm

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Additional Weight/Equipment

Flag Facilities = 100 tons
x2 Powder Catapults = 40 Tons Above Deck
x4 Floatplanes = 160 tons
X4 Floatplane space hanger = 120 tons
x1 Heavy Cranes = 25 tons Above Deck
x7 Analog Firecontrol Computers (FFC) = 21 tons
x4 Hybrid FFC = 8 tons
x1 SG Radar = 1.5 tons
x1 CXAM Antenna = 2.5 tons

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Ends are actually a .4 of length strake over shafts and steering. Assumes Iowa-style steering abreast.
Strake tapers from 10"/250mm over the steering area by .2 percent of strake length to 6"/150mm over shaft at .8 percent of strake length.