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Friday, January 28, 2005

My attempt at a new Kongo-type battlecruiser

I just tried a new Kongo-type battlecruiser, and it worked out pretty well. It is not like the Kongo in the sense that I used the all-or-nothing armoring scheme, but I did attempt to use a raised forecastle and have 4 calibers of guns. The armor basis is somewhat greater, but I retained the 31 knots speed, although the ship is larger. I also wanted long range: 12,000nm for Pacific operations.
Jap/CB/1927, Enter country Enter ship type laid down 1927

Displacement:
	35,341 t light; 37,056 t standard; 40,778 t normal; 43,756 t full load

Dimensions: Length overall / water x beam x draught
	815.56 ft / 814.00 ft x 101.00 ft x 31.00 ft (normal load)
	248.58 m / 248.11 m x 30.78 m  x 9.45 m

Armament:
      8 - 14.00" / 356 mm guns (4x2 guns), 1,372.00lbs / 622.33kg shells, 1927 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      16 - 5.50" / 140 mm guns (8x2 guns), 83.19lbs / 37.73kg shells, 1927 Model
	  Breech loading guns in deck mounts with hoists
	  on side, evenly spread, 7 raised mounts
      12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1927 Model
	  Dual purpose guns in deck mounts with hoists
	  on side ends, evenly spread, all raised mounts - superfiring
      45 - 0.98" / 25.0 mm guns (15x3 guns), 0.48lbs / 0.22kg shells, 1927 Model
	  Anti-aircraft guns in deck mounts 
	  on side ends, majority aft, all raised mounts - superfiring
	Weight of broadside 13,078 lbs / 5,932 kg
	Shells per gun, main battery: 120

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	9.00" / 229 mm	560.00 ft / 170.69 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 106 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	560.00 ft / 170.69 m	27.00 ft / 8.23 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	10.0" / 254 mm	7.00" / 178 mm		9.00" / 229 mm
	2nd:	2.00" / 51 mm	2.00" / 51 mm		2.00" / 51 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 7.00" / 178 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 165,366 shp / 123,363 Kw = 31.00 kts
	Range 12,000nm at 15.00 kts
	Bunker at max displacement = 6,700 tons

Complement:
	1,434 - 1,865

Cost:
	£12.149 million / $48.596 million

Distribution of weights at normal displacement:
	Armament: 1,635 tons, 4.0 %
	Armour: 11,850 tons, 29.1 %
	   - Belts: 3,612 tons, 8.9 %
	   - Torpedo bulkhead: 1,119 tons, 2.7 %
	   - Armament: 2,655 tons, 6.5 %
	   - Armour Deck: 4,286 tons, 10.5 %
	   - Conning Tower: 179 tons, 0.4 %
	Machinery: 5,220 tons, 12.8 %
	Hull, fittings & equipment: 16,636 tons, 40.8 %
	Fuel, ammunition & stores: 5,438 tons, 13.3 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  60,938 lbs / 27,641 Kg = 44.4 x 14.0 " / 356 mm shells or 8.7 torpedoes
	Stability (Unstable if below 1.00): 1.07
	Metacentric height 5.8 ft / 1.8 m
	Roll period: 17.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 64 %
			- Recoil effect (Restricted arc if above 1.00): 0.84
	Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.560
	Length to Beam Ratio: 8.06 : 1
	'Natural speed' for length: 28.53 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 1.00 degrees
	Stern overhang: 1.00 ft / 0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		32.00 ft / 9.75 m
	   - Forecastle (20 %):	30.00 ft / 9.14 m
	   - Mid (65 %):		30.00 ft / 9.14 m (21.00 ft / 6.40 m aft of break)
	   - Quarterdeck (15 %):	21.00 ft / 6.40 m
	   - Stern:		21.00 ft / 6.40 m
	   - Average freeboard:	27.01 ft / 8.23 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 90.6 %
		- Above water (accommodation/working, high = better): 209.5 %
	Waterplane Area: 57,917 Square feet or 5,381 Square metres
	Displacement factor (Displacement / loading): 115 %
	Structure weight / hull surface area: 195 lbs/sq ft or 953 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.35
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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