1937 IJN Yonaga

IJN 夜長 Yonaga, Japanese Large Light Fast Aviation Oiler laid down 1937

Displacement:
	33,459 t light; 35,000 t standard; 48,000 t normal; 58,400 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(1,131.89 ft / 1,115.49 ft) x 144.36 ft x (28.15 / 31.75 ft)
	(345.00 m / 340.00 m) x 44.00 m  x (8.58 / 9.68 m)

Armament:
      4 - 16.14" / 410 mm 45.0 cal guns - 2,248.72lbs / 1,020.00kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1937 Model
	  2 x 2-gun mounts on centreline, aft evenly spread
      8 - 4.72" / 120 mm 45.0 cal guns - 44.75lbs / 20.30kg shells, 300 per gun
	  Dual purpose guns in deck mounts, 1921 Model
	  4 x Twin mounts on centreline, forward evenly spread
		2 raised mounts
      48 - 0.98" / 25.0 mm 60.0 cal guns - 0.55lbs / 0.25kg shells, 1,500 per gun
	  Anti-air guns in deck mounts, 1935 Model
	  40 x Single mounts on sides, evenly spread
	  8 x Single mounts on sides, evenly spread
		8 double raised mounts
      Weight of broadside 9,379 lbs / 4,254 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Ends:	Unarmoured

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.77" / 45 mm	814.30 ft / 248.20 m	24.28 ft / 7.40 m
	Beam between torpedo bulkheads 104.99 ft / 32.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	0.98" / 25 mm	0.98" / 25 mm		0.98" / 25 mm
	3rd:	0.20" / 5 mm	0.20" / 5 mm		      -

   - Box over magazines:
	0.98" / 25 mm

Machinery:
	Oil fired boilers, steam turbines,
	Electric motors, 4 shafts, 293,096 shp / 218,649 Kw = 38.00 kts
	Range 22,363nm at 20.00 kts
	Bunker at max displacement = 23,400 tons

Complement:
	1,620 - 2,107

Cost:
	£17.032 million / $68.127 million

Distribution of weights at normal displacement:
	Armament: 1,745 tons, 3.6 %
	   - Guns: 1,745 tons, 3.6 %
	Armour: 1,477 tons, 3.1 %
	   - Torpedo bulkhead: 1,296 tons, 2.7 %
	   - Armament: 108 tons, 0.2 %
	   - Armour Deck: 72 tons, 0.2 %
	Machinery: 8,123 tons, 16.9 %
	Hull, fittings & equipment: 21,550 tons, 44.9 %
	Fuel, ammunition & stores: 14,541 tons, 30.3 %
	Miscellaneous weights: 564 tons, 1.2 %
	   - Hull above water: 414 tons
	   - Above deck: 150 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  103,973 lbs / 47,161 Kg = 49.4 x 16.1 " / 410 mm shells or 17.2 torpedoes
	Stability (Unstable if below 1.00): 1.50
	Metacentric height 17.4 ft / 5.3 m
	Roll period: 14.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 100 %
			- Recoil effect (Restricted arc if above 1.00): 0.14
	Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
	Hull has rise forward of midbreak,
	  an extended bulbous bow and large transom stern
	Block coefficient (normal/deep): 0.371 / 0.400
	Length to Beam Ratio: 7.73 : 1
	'Natural speed' for length: 39.76 kts
	Power going to wave formation at top speed: 47 %
	Trim (Max stability = 0, Max steadiness = 100): 77
	Bow angle (Positive = bow angles forward): 20.00 degrees
	Stern overhang: 1.64 ft / 0.50 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	22.00 %,  39.37 ft / 12.00 m,  31.17 ft / 9.50 m
	   - Forward deck:	52.00 %,  31.17 ft / 9.50 m,  31.17 ft / 9.50 m
	   - Aft deck:	21.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
	   - Quarter deck:	5.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
	   - Average freeboard:		27.20 ft / 8.29 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 99.1 %
		- Above water (accommodation/working, high = better): 308.5 %
	Waterplane Area: 100,990 Square feet or 9,382 Square metres
	Displacement factor (Displacement / loading): 184 %
	Structure weight / hull surface area: 193 lbs/sq ft or 940 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 1.00
		- Longitudinal: 1.00
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily

Can engage any ship by staying at out-range and using spotter aircraft for fire direction, while the enemy cannot effectively return fire due to short gun range and/or their own spotter aircraft being shot down.
Can circumnavigate the word without refuelling, at cruise speed.
Can act as a fast, armed oiler either for fleet operations or to transport crude produced in acquired territories.
Can be easily converted into a large, fast fleet carrier.

0x 46cm/50 5th Year Type - A-Bs-C-X(s)-Y
4x 41cm/50 11th Year Type - X-Y
8x 12cm/45 10th Year Type - Yorktown-like arrangement
40x 25mm/60 AAMG Type 96 - along hull sides and superstructure

Misc Weight:
100t - Command Facilities
25t - 1x Heavy Crane
25t - 1x Compressed Air Catapult

30t - 1x maintenance hangar
120t - 6x A5M Fighter (VSTOL, no flight deck or other CV ancillary equipment required, 237 knots)
240t - 12x E8N Reconnaisance Seaplane (162 knots)

24t - 18x aircraft spares (6x A5M, 12x E8N)

At high speed in a modest headwind, A5M can take off or land vertically, thus no flight deck is required. They provide an organic screening element against any enemy fast, light reconnaisance forces and torpedo-craft.

Torpedo bulkhead is declined slightly and extends to the first deck above the waterline, providing some additional resistance to splinter damage near the waterline. Magazine ends one deck below waterline and is covered by an armoured deck for splinter protection.