Nihon Kaigun 1946

[KHT]

Amazing work BB! Those monsters look like they could destroy anything without any effort!
Could you be a dear and make a springsharp report for her as well?
Btw, Emp_Andreas, great work on the story.

[BB1987]

who asked for Springsharp?

1941 version:

Code: Select all

Yoshino, Japan Battleship laid down 1924 (Engine 1938)

Displacement:
	54.780 t light; 57.728 t standard; 61.605 t normal; 64.706 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(920,96 ft / 903,05 ft) x 101,05 ft (Bulges 111,55 ft) x (32,48 / 34,02 ft)
	(280,71 m / 275,25 m) x 30,80 m (Bulges 34,00 m)  x (9,90 / 10,37 m)

Armament:
      8 - 18,11" / 460 mm 45,0 cal guns - 2.995,22lbs / 1.358,61kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1939 Model
	  4 x Twin mounts on centreline ends, evenly spread
		2 raised mounts - superfiring
      16 - 5,51" / 140 mm 50,0 cal guns - 88,63lbs / 40,20kg shells, 250 per gun
	  Breech loading guns in casemate mounts, 1914 Model
	  16 x Single mounts on sides, evenly spread
      8 - 5,00" / 127 mm 40,0 cal guns - 59,90lbs / 27,17kg shells, 450 per gun
	  Anti-air guns in deck mounts, 1929 Model
	  4 x Twin mounts on side ends, evenly spread
		4 double raised mounts
      26 - 0,98" / 25,0 mm 60,0 cal guns - 0,52lbs / 0,24kg shells, 9.000 per gun
	  Machine guns in deck mounts, 1935 Model
	  2 x Triple mounts layout not set
	  10 x Twin mounts on sides, forward evenly spread
		10 double raised mounts
      Weight of broadside 25.873 lbs / 11.736 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13,0" / 330 mm	528,94 ft / 161,22 m	13,98 ft / 4,26 m
	Ends:	Unarmoured
	Upper:	6,22" / 158 mm	528,94 ft / 161,22 m	8,99 ft / 2,74 m
	  Main Belt covers 90% of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		6,22" / 158 mm	528,94 ft / 161,22 m	29,49 ft / 8,99 m
	Beam between torpedo bulkheads 94,49 ft / 28,80 m

   - Hull Bulges:
		1,30" / 33 mm	647,83 ft / 197,46 m	45,70 ft / 13,93 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	25,6" / 650 mm	10,2" / 260 mm		15,0" / 380 mm
	2nd:	2,05" / 52 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 5,00" / 127 mm
	Forecastle: 1,57" / 40 mm  Quarter deck: 1,57" / 40 mm

   - Conning towers: Forward 15,98" / 406 mm, Aft 0,00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 195.934 shp / 146.167 Kw = 30,30 kts
	Range 9.000nm at 16,00 kts
	Bunker at max displacement = 6.978 tons

Complement:
	1.954 - 2.541

Cost:
	£15,447 million / $61,788 million

Distribution of weights at normal displacement:
	Armament: 4.000 tons, 6,5%
	   - Guns: 4.000 tons, 6,5%
	Armour: 21.507 tons, 34,9%
	   - Belts: 5.375 tons, 8,7%
	   - Torpedo bulkhead: 3.591 tons, 5,8%
	   - Bulges: 1.423 tons, 2,3%
	   - Armament: 5.142 tons, 8,3%
	   - Armour Deck: 5.440 tons, 8,8%
	   - Conning Tower: 537 tons, 0,9%
	Machinery: 5.365 tons, 8,7%
	Hull, fittings & equipment: 21.832 tons, 35,4%
	Fuel, ammunition & stores: 6.825 tons, 11,1%
	Miscellaneous weights: 2.076 tons, 3,4%
	   - Hull below water: 340 tons
	   - Bulge void weights: 836 tons
	   - On freeboard deck: 900 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  92.344 lbs / 41.886 Kg = 31,1 x 18,1 " / 460 mm shells or 17,1 torpedoes
	Stability (Unstable if below 1.00): 1,16
	Metacentric height 6,7 ft / 2,0 m
	Roll period: 18,1 seconds
	Steadiness	- As gun platform (Average = 50 %): 50 %
			- Recoil effect (Restricted arc if above 1.00): 0,74
	Seaboat quality  (Average = 1.00): 1,17

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and a round stern
	Block coefficient (normal/deep): 0,659 / 0,661
	Length to Beam Ratio: 8,10 : 1
	'Natural speed' for length: 30,05 kts
	Power going to wave formation at top speed: 50 %
	Trim (Max stability = 0, Max steadiness = 100): 43
	Bow angle (Positive = bow angles forward): 27,00 degrees
	Stern overhang: 0,52 ft / 0,16 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	22,18%,  34,12 ft / 10,40 m,  25,98 ft / 7,92 m
	   - Forward deck:	28,51%,  25,98 ft / 7,92 m,  23,98 ft / 7,31 m
	   - Aft deck:	28,51%,  23,98 ft / 7,31 m,  22,64 ft / 6,90 m
	   - Quarter deck:	20,80%,  22,64 ft / 6,90 m,  21,98 ft / 6,70 m
	   - Average freeboard:		24,89 ft / 7,59 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 68,6%
		- Above water (accommodation/working, high = better): 165,9%
	Waterplane Area: 70.483 Square feet or 6.548 Square metres
	Displacement factor (Displacement / loading): 109%
	Structure weight / hull surface area: 223 lbs/sq ft or 1.088 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0,99
		- Longitudinal: 1,03
		- Overall: 1,00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room

1944 version:

Code: Select all

Yoshino, Japan Battleship laid down 1924 (Engine 1938)

Displacement:
	54.431 t light; 57.728 t standard; 61.605 t normal; 64.706 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(920,96 ft / 903,05 ft) x 101,05 ft (Bulges 111,55 ft) x (32,48 / 34,02 ft)
	(280,71 m / 275,25 m) x 30,80 m (Bulges 34,00 m)  x (9,90 / 10,37 m)

Armament:
      8 - 18,11" / 460 mm 45,0 cal guns - 2.995,22lbs / 1.358,61kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1939 Model
	  4 x Twin mounts on centreline ends, evenly spread
		2 raised mounts - superfiring
      14 - 5,51" / 140 mm 50,0 cal guns - 88,63lbs / 40,20kg shells, 250 per gun
	  Breech loading guns in casemate mounts, 1914 Model
	  14 x Single mounts on sides, evenly spread
      12 - 5,00" / 127 mm 40,0 cal guns - 59,90lbs / 27,17kg shells, 450 per gun
	  Anti-air guns in deck mounts, 1929 Model
	  2 x Twin mounts on sides, aft deck forward
		2 raised mounts
	  4 x Twin mounts on side ends, evenly spread
		4 double raised mounts
      146 - 0,98" / 25,0 mm 60,0 cal guns - 0,52lbs / 0,24kg shells, 9.000 per gun
	  Machine guns in deck mounts, 1935 Model
	  42 x Triple mounts on sides, evenly spread
		28 raised mounts
	  10 x Twin mounts on sides, forward evenly spread
		10 double raised mounts
      Weight of broadside 25.998 lbs / 11.792 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13,0" / 330 mm	528,94 ft / 161,22 m	13,98 ft / 4,26 m
	Ends:	Unarmoured
	Upper:	6,22" / 158 mm	528,94 ft / 161,22 m	8,99 ft / 2,74 m
	  Main Belt covers 90% of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		6,22" / 158 mm	528,94 ft / 161,22 m	29,49 ft / 8,99 m
	Beam between torpedo bulkheads 94,49 ft / 28,80 m

   - Hull Bulges:
		1,30" / 33 mm	647,83 ft / 197,46 m	45,70 ft / 13,93 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	25,6" / 650 mm	10,2" / 260 mm		15,0" / 380 mm
	2nd:	2,05" / 52 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 5,00" / 127 mm
	Forecastle: 1,57" / 40 mm  Quarter deck: 1,57" / 40 mm

   - Conning towers: Forward 15,98" / 406 mm, Aft 0,00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 195.934 shp / 146.167 Kw = 30,30 kts
	Range 9.000nm at 16,00 kts
	Bunker at max displacement = 6.978 tons

Complement:
	1.954 - 2.541

Cost:
	£15,436 million / $61,745 million

Distribution of weights at normal displacement:
	Armament: 4.018 tons, 6,5%
	   - Guns: 4.018 tons, 6,5%
	Armour: 21.500 tons, 34,9%
	   - Belts: 5.375 tons, 8,7%
	   - Torpedo bulkhead: 3.591 tons, 5,8%
	   - Bulges: 1.423 tons, 2,3%
	   - Armament: 5.134 tons, 8,3%
	   - Armour Deck: 5.440 tons, 8,8%
	   - Conning Tower: 537 tons, 0,9%
	Machinery: 5.365 tons, 8,7%
	Hull, fittings & equipment: 21.812 tons, 35,4%
	Fuel, ammunition & stores: 7.173 tons, 11,6%
	Miscellaneous weights: 1.736 tons, 2,8%
	   - Bulge void weights: 836 tons
	   - On freeboard deck: 900 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  92.002 lbs / 41.732 Kg = 31,0 x 18,1 " / 460 mm shells or 17,1 torpedoes
	Stability (Unstable if below 1.00): 1,16
	Metacentric height 6,7 ft / 2,0 m
	Roll period: 18,1 seconds
	Steadiness	- As gun platform (Average = 50 %): 50 %
			- Recoil effect (Restricted arc if above 1.00): 0,75
	Seaboat quality  (Average = 1.00): 1,17

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and a round stern
	Block coefficient (normal/deep): 0,659 / 0,661
	Length to Beam Ratio: 8,10 : 1
	'Natural speed' for length: 30,05 kts
	Power going to wave formation at top speed: 50 %
	Trim (Max stability = 0, Max steadiness = 100): 43
	Bow angle (Positive = bow angles forward): 27,00 degrees
	Stern overhang: 0,52 ft / 0,16 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	22,18%,  34,12 ft / 10,40 m,  25,98 ft / 7,92 m
	   - Forward deck:	28,51%,  25,98 ft / 7,92 m,  23,98 ft / 7,31 m
	   - Aft deck:	28,51%,  23,98 ft / 7,31 m,  22,64 ft / 6,90 m
	   - Quarter deck:	20,80%,  22,64 ft / 6,90 m,  21,98 ft / 6,70 m
	   - Average freeboard:		24,89 ft / 7,59 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 68,7%
		- Above water (accommodation/working, high = better): 165,9%
	Waterplane Area: 70.483 Square feet or 6.548 Square metres
	Displacement factor (Displacement / loading): 110%
	Structure weight / hull surface area: 223 lbs/sq ft or 1.088 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0,99
		- Longitudinal: 1,03
		- Overall: 1,00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room

[heuhen]

STOP TAKING SPEED!

[emperor_andreas]

Thanks, KHT...I hope to eventually finish this AU at some point, but it looks like I'm a long way off.

[Hood]

Outstanding additions, the Yoshino is very impressive and the cruisers are also very interesting.

[bezobrazov]

Very interesting story, though I'm a tad doubtful whether the Kitami could've sunk the USS New Jersey with a single salvo into her forward magazines. Even with an imposing 18" shell it'd be very hard to penetrate an inclined vertical armor that equals about 16" non-inclined. I have studied the turret configuration of the Iowas and I can not see how that might be possible. Unlike British and German battleships, the USN preferred to have their handling rooms below the shell room, with last proof automatically rotating doors and shutes. Therefore an impact in the magazines, would not have vented downwards, but upwards and sideways. The shells would not have been set off; it was the cordite in the steel canisters which were the feared culprits. However, as I see it, a shell would not ave been able to penetrate the forward hull armor at an oblique angle, nor at an inclined angle; the upper (strength) deck could've been penetrated and a hell could've detonated in either 'A' or 'B' turrets she'll rooms, but thanks to the above described blast protection, it is highly doubtful whether the lash from the blast could've penetrated further down. Sure enough, the New Jersey would've become a cripple, with her forward battery knocked out of action, and he might even have suffered considerable carnage top deck, but blown up? I don't think so. She would've limped away but to safety...

[BB1987]

i've been in the mood for another extra, so i've done Yoshino as of March 1946, just a month before she struck a mine that kept her out of the last four months of the war because of the repairs needed.



during the post-Leyte Gulf refit two Aichi E16A replaced the E13A and the Mitsubishi F1M, another two 5.5-inch (140mm) casemate guns where landed and two twin 5-inch (127mm) AA guns where added; light anti-aircraft suite was also further argumented, the triple mount previously placed where the new 5-inch mounts now stood where relocated to newly built sponsons located on the back of the funnel, the ten twin 25mm mounts where replaced by triples, finally four new triple mounts (two on the bow and two on the pagoda mast) where added to reach a grand total of 168 machine gun barrels in 56 triple mounts.
complement further rose to over 3.000 men

[emperor_andreas]

Awesome job!

[Erusia Force]

So if Japan did build these monsters, wouldn't that mean that the Yamato's wouldn't be built? From what I know, the A-150 project was necessitated because these behemoths were stopped by the Washington naval treaty.

[emperor_andreas]

It might, but what can I say? I couldn't do an IJN AU without the Yamatos or their successors. Without the Yamatos, would it really be a WWII IJN AU?