日本无畏型战列舰一览

Specifications
Yamato Class Battleships
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Name Builder LD LCH COM #108 Yamato Kure Navy Yard Nov.4/37 Aug.8/40 Dec.16/41
blew up and sank Apr.7/45 at 1435 hours south west of Kyuscho while on a suicide run to Okinawa after being hit by 11-13 torpedoes and at least 7 bombs see history
Name Builder LD LCH COM
#109 Musashi Nagasaki Yard,
Mitsubishi Co. Mar.29/38 Nov.1/40 Aug.5/42
lost headway and sank Oct.24/44 in the Sibuyan Sea, south of Luzon after sustaining 20 torpedo hits and 17 bombs
see history
Name Builder LD LCH COM
#110 Shinano Yokosuka Navy Yard May.4/40 Oct.8/44
as CV Nov.19/44
started conversion into carrier late 1942
completed Nov./44
sank Nov.29/44 by USS Archerfish by 4 torpedoes while being moved to Kure for fitting out.
see Carrier Shinano
Name Builder LD STATUS COM
# 111 Kure Navy Yard Nov.7/40 cancelled 1942
scrapped 1943 N/A
Particular Preparations For Construction
When the construction of the Yamato class was planned, there was no shipyard in Japan capable of building such ships without expanding it's building facilities.
Since the Japanese Navy intended to build four Yamato class ships in succession, special preparations for their construction had to be made in selected shipyards.
Some of these arrangements consisted of expanding dock capacities, building a special transport ship capable of carrying an 18 inch gun turret and hiding such a vessel behind sisal rope curtains for security reasons.
The depth of the building dock at the Kure naval yard, in which the Yamato was built, was deepened about 3 feet so that the hull could be floated in the dock.
The capacity of the gantry crane straddling the dock was increased to 100 tons in order to lift heavy armor plates. Furthermore, about a quarter of the dock at the landward end was covered with a roof to prevent it from being seen from a prominent hill nearby.
In the Yokosuka district a large dry dock was specially built and the third ship of the Yamato class, later named Shinano and converted into a carrier was built there.
The Nagasaki Yard of Mitsubishi Heavy Industries Co. Ltd. was the only other shipyard capable of building a Yamato class battleship. even with some expansion of it's facilities.
Unlike Kure's building dock a slipway was to be used for the construction there. Needless to say, the launching of a vessel weighing 30,000 tons raised various problems technically. Not only was the slipway strengthened but workshops and piers were also expanded or strengthened. The overall area of the expansion of the workshops reached a total of almost 787,401 square feet. Floating cranes of 350 tons and 150 tons were built and installed to lift heavy armor plates and gun fittings.
At Sasebo, one of the three major naval bases in Japan, a dry dock capable of accommodating a Yamato class battleship was also built.
Some measures taken to safeguard the security of the Musashi were interesting.
The slipway on which she was built was covered by a sisal rope curtain.
The total length of rope used reached 1,683 miles and it's weight totaled 408 tons. This great consumption of sisal rope caused a temporary shortage of this item on the market, and caused complaints among fishermen.
One more thing to be mentioned was the construction of a transport vessel to carry the 18 inch guns and turrets from Kure to either Nagasaki, where the Musashi was being built, or to Yokosuka, where the Shinano was to be built.
These 18 inch guns and turrets were manufactured at the Kure naval yard and they could be transported only by this specially-built vesse
Even in accommodation the Yamato had remarkable features.
She was the first Japanese warship to be equipped with an air conditioning system.
Although this comfort was not afforded to all the living quarters, the Yamato and her sister Musashi had a favorable reputation among sailors as the most comfortable ships in the Japanese Navy.
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Displacement
Design 61,890 tons  
Standard 63,200 tons
Trial 69,100 tons
Full Load 72,809 tons
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Dimensions
Overall 863.5' (263.2m)
Waterline 830.0' (253m)
Beam 127.6' (38.9m)
Draught (full load) 35.62' (10.9m)
Features Of The Hull:
One of the more notable features of the Yamato's hull was that her displacement/length ratio was great, and her speed/ length ratio was small, compared with other battleships. While these ratios for the IJN Nagato was 98.14 and 1.001 respectively as compared with 101 and 0.852 for the Royal Navy's battleship Nelson, those of the new Japanese battleship were 112.2 and 0.94 respectively. Moreover her block co-efficient was 0.612, perhaps the highest figure among all the battleships in the world. This meant that she had great beam and shallow draught for such a big displacement.
Reduction of the Yamato's draught as much as possible was a prime consideration, in view of port facilities and naval bases in Japan.   Nevertheless her draught when fully loaded reached 35.63 feet and some areas of the naval bases and extensive portions of the approaches to dry docks used by warships of this class had to be dredged accordingly.
How to reduce the hull resistance and increase the propulsive efficiency was the next problem which the designers strove to solve. Tests were conducted with various hull models in the experimental model basin of the Naval Technical Research Establishment in Tokyo. This basin was the largest in Japan, having a length of 805.54 feet, a width of 41 feet and a depth of 21.35 feet.
These thorough and extensive experiments led to the adoption of a gigantic bulbous bow, the size of which few other naval architects had ever planned. The result was unique; the reduction of the hull resistance by the use of this bulbous bow reached 8.2% at a speed of 27 knots.
By improving the fitting of the shaft brackets and the bilge keels, a further reduction in the hull resistance was achieved. Represented in terms of effective horsepower, the former resulted in the saving of 1,900 ehp and the latter 475 ehp. Altogether including the reduction in resistance by the use of the bulbous bow, these savings totaled 7,910 shp or 15,820 shp.
In the full power trial runs, the 69,500 ton Yamato, powered by 153,553 SHP made 27.46 knots. EHP at this time was calculated at 76,700 hp, the propulsive efficiency at her standard speed of 18 knots proved to be 58.7%. Such efficiency was obtained by only a few vessels of the Japanese Navy.
Another important feature was the extensive use of lap-joints in the midship part of the shell plating. The butt-joint had long been used in shell plating to make the shell surface smooth, thus reducing it's frictional resistance. However a serious defect had been found in the outer bottom butt-joint plates of the Isuzu class light cruisers and Fubuki class destroyers. This led to the apprehension regarding the use of butt-joints on the Yamato's shell plating. On the other hand, it was learned that frictional resistance was greatly affected by the surface of the fore and aft parts of the ship, where the water pressure was greater then amidships. Based on this finding, butt-joints were used in the fore and aft parts of the Yamato; the remaining part was covered by lap-joint plating. The method proved very effective when the ship was completed.
Hull Structure
In the hull structure, too, several new measures were adopted to ensure the required strength and at the same time, save weight:
Here are some examples;
First some of the armor was fitted to serve as hull strength members.
The lower side armor was fitted to serve dually as longitudinal members. This was a unique method that the Japanese Navy had applied to medium armor plating since it was first applied to the Heavy cruiser Furataka, whose characteristics surprised world shipbuilding circles at the time.
Second, electric welding was employed extensively except in the longitude members. The Japanese Navy was rather early in applying welding to the construction of ship's hulls. The 10,000 ton submarine tender Taigei, which was completed in 1934, was the first ship in the Japanese Navy with a completely welded shell.
However, two subsequent disasters, which involved Japanese men of-war led to a thorough investigation of shipbuilding techniques. In March, 1934 a small destroyer capsized in heavy weather, while in September of the following year, two large destroyers broke in two and another sustained heavy damage in rough weather. An extensive and thorough investigation as then carried out. The wisdom of welding was also reviewed, and it was decided not to use welding in such important portions as longitudinal structure members.
Most of the Yamato's upper structure was constructed by means of welding. The largest welded block for the Yamato was 36 feet high and weighed 80 tons. The total length of the welded portions of the Yamato reached 1,521,601 feet and the total number of welding rods used in the construction was 7,507,536. By comparison the total number of rivets was 6,153,030.
Third,the main portion of the longitudinal structure was constructed with Ducol steel, while other  portions were built of mild steel.
Fourth, the central longitudinal bulkhead was duplicated as it was to support heavy 7.87 inch thick armored deck plates, 127.62 feet at their greatest breadth. To ensure the reliability of the electric circuits, the central ringman electric circuit ran through the watertight compartment inside the central bulkhead.
Another unique feature was her flush weather deck from bow to stern, giving her an extraordinary appearance for a battleship. The idea was to make the longitudinal members continuos so as to be most effective and at the same time save structural weight. This method had been adopted in building Japanese warships ever since it first applied to the heavy cruiser Furataka.
The Yamato's stern casing , which had to support her heavy 2,490 ton stern portion was an extraordinary one too. Made of cast steel, it weighed 91.3 tons
Maneuverability
The Yamato's turning ability was excellent.
Her tactical diameter,  when turned by a maximum rudder angle of 36 degrees at a speed of 26 knots was 2099 feet.
These figures were considered superior when compared to other battleships.
The Yamato had two rudders, the main and auxiliary, instead of the twin-rudder system of ordinary large warships.
Originally it was planned to install two rudders, one each fore and aft, in view of the fact that the German Bismarck finally lost her maneuverability ability due to damage to her rudders .
But the design was later changed so as to install the auxiliary rudder about 49 feet ahead of the main one.
In her trial runs it was discovered that the auxiliary rudder alone was unable to stop the momentum of a turn once started.  
Stability And Trim Under Damaged Conditions
Compared with other Japanese battleships, the Yamato was well designed to survive in a damaged condition.
This was well demonstrated in the Yamato's last hours and that of her sister Musashi, although both were eventually sunk.
The Yamato's fore freeboard was 32.8 feet and aft was 20,9 feet .
These figures were remarkable compared with the Nagatos', which was 25.9 feet and 15.7 feet respectively.
Accordingly her reserve buoyancy reached as much as 54,450 tons compared to 29,292 tons for the Nagato.
The Yamato was designed to maintain stability until her heel reached 20 degrees.
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Propulsion
Boilers 12 Kanpon boilers  
Temperature 325 degrees C
Turbines Kanpon geared steam turbines  
Shafts 4
Horsepower 150,000 shp design
153,553 shp trials
Endurance 7,200 NM @ 16 knts
Speed 27.46 knts max trials  
Oil Capacity 6,300 tons
Machinery
Arrangement The Yamato's 150,000 SHP main machinery was not unique in any way, but it's arrangement in four rows was noteworthy.
The 13,500 hp boilers were arranged in four rows, three in each row, each comprising a single cell.

Three boilers in one row were connected to one of the four turbines which were also installed in four rows. From the standpoint of damage control and protection, this was naturally a most desirable arrangement. However only a vessel of great beam such as the Yamato could possibly have such an arrangement.
How the Yamato improved her shaft horsepower per square meter of engine room can be seen in the following table:
Ship SHP Engine Room Floor AE(M? SHP/AE
Nagato 82,300 516 158
Yamato 150,000 640 238
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Armor
Side 16.14" (410mm) Vickers with .35" (8.9mm) Ducol steel plate backing
15.74" (400mm) Vickers with .35" (8.9mm) Ducol steel plate backing (hull #110 & 111)
1" (25mm) DS steel at engine rooms (hull #110 & 111)
3" (76mm) ends
6" (152mm) upper belt
Deck 1.3"-1.9" (33-48.3mm) superstructure deck
7.87" (200mm) MNC main deck
7.48" (190mm) MNC main deck (hull #110 & 111)
3.5" (89mm) second deck
Main Turrets 25.6" (650mm) faces
15" (381mm) sides
Secondary
(155mm mounts) 1" (25mm) NVNC
Barbettes 21.5" (546mm) sides
21.25" (540mm) sides (hull #110 & 111)
Conning Tower 19.5" (495.3mm) sides
Watertight
Compartments 1,065 below waterline
82 above armour deck
The Yamato was undoubtedly the most heavily armored man-of-war ever built.
Her vital parts were protected on the sides by 16.141 inch Vickers hardened armor plates capable of withstanding the force of an 18 inch projectile fired at more then 21,872 yards.
Her 7.87 inch MNC deck plates could be penetrated only by a 2,204 pound armor-piercing bomb dropped from a height of 11,154 feet or more.
Even part of the fore and aft uppermost decks other then the armor protected vital part was protected by 1.4 inch to 1.97 inch CNC, the latter sufficient to repel a 550 pound bomb dropped from a dive bomber.
In designing the Yamato's, efforts were made to minimize the length of the vital part that had to be protected by heavy armor plates.  
Ship Comparisons
Ship Side Armor Deck Armor Water line armor length/percentage
Yamato 16.14" 7.87" 53.5&
Iowa 12.1" 1.5" main--6" second +1.5"   
Nelson 14.12" 6.32" 54.7%
Nagato     63.15%
Thick armor plates around the vital parts were not the only protective features provided on the Yamato.
Her steering engine compartments (the Yamato had two sets of steering apparatus, the main and auxiliary to safeguard her steering ability), were protected by armor as heavy as that given to the other armored portions.
In addition the floors of the Yamato's magazines were protected by 1.96 inch to 3.14 inch armor plates.
These plates extended from the bottoms of the magazines across the watertight compartments inside the double bottom of the shell.
The idea was to protect from the explosion of a torpedo or mine underneath the ship.
Another feature was the perforated armor plates for her funnel uptake protection, chosen in preference to conventional coaming armor.
After careful tests, 14.96 inch armor plating with perforations of 7 inch in diameter was adopted, the total area of the holes being less then 55% of the whole area of the plate. In addition, the inclined surface of the funnel was protected by 1.96 inch armor which would detonate bombs before the exploded on the surface of the perforated plating, from where the output of smoke from 12 boilers escaped. This new method of funnel hole protection resulted in a substantial reduction of the weight of armor.
The percentage of the Yamato's weight used entirely for protection compared with the total tonnage as designed was high. While that of the Nagato was 32.06%, the highest figure among the Japanese warships before the Yamato, that of the Yamato was 34.4%.
Armor Plates
Some important factors should be mentioned in connection with the Yamato's armor plates, which were manufactured after ten years of intensive study on the part of naval technicians. The front and side barbette armor, which had to resist the terrific kinetic energy of an 18 inch projectile having a speed of approximently 1,640 feet per second consisted of 22 inch and 16.17 inch respectively. An extremely hard surface was a requisite for such armor plate, but the ordinary method of cementation was expensive and incapable of giving the result desired for such thick plates. Instead of the cementation method, therefore, a special method was adopted to harden the surface of such thick plates. This new method proved very effective, not only could it harden the portion reaching as thick as 5.5 inches from the surface, but it also greatly reduced the production cost and time.
Theoretically, the resistance of armor plate to a projectile is not uniform. It is least at it's edge, which means the larger a piece of armor plate the greater the resistance that can be expected. The Japanese Navy ignored expense in expanding the necessary facilities to manufacture larger pieces of armor plate for the Yamato's. According to records, about 10 million dollars was spent on expansion of steel-plate manufacturing facilities. The dimensions of a piece of side armor manufactured 19.3 feet by 11.8 feet, 69 square feet, 16.14 inch thick and weighing 68.5 tons.
How to construct a sufficiently strong armor shelf; especially at the lower edge of the 16.14 inch side armor, to resist the shock of a projectile hit, was a big problem too. The Yamato's side armor was equipped so as to drive a wedge with the wedge angle at 10 degrees at it's lowest edge, when struck by the shock of a direct hit, but even this method proved insufficient after she was commissioned in to service. In the war, she was hit by a torpedo and her side armor at the point of impact was indented about 3 feet. another feature of the armor protection was the 0.35 inch Ducol steel plates which extended along 27 inches underneath the armor deck. Their purpose was to afford protection from possible splinters such as armor bolts and rivet heads when the armor deck was hit by an enemy bomb or projectile.
Watertight Compartments

Much attention was also directed towards the maintenance of buoyancy by increasing the number of watertight compartments. The Yamato had 1147 watertight compartments; 1065 below the armor deck and 82 above. The Nagato's had 1089; 865 below and 224 above.
The reason for fewer for fewer above the armored deck as compared to other ships was the fact that the Yamato's armored deck was comparatively high above the waterline.  
Flooding & Pumping Systems

The flooding and pumping system of the Yamato's was designed to satisfy the following requirements:
    1) The heel and trim resulting from the first torpedo hit could be rectified within 4 degrees heel and 7.5 feet draft difference between the fore and aft within five minutes after the damage control system was started.
    2) The heel and trim resulting from the second torpedo hit could be controlled within 30 minutes by the same standards
By flooding the damage control tanks on the opposite side, the Yamato could also be righted by 13.8 degrees maximum and another 4.5 degrees of heel could be added by shifting fuel to the opposite tanks. It was believed that this system could enable the Yamato to return to almost even keel from a list of 18.3 degrees.
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Armament
Main Battery 9 x 18.1"/45 cal Model 1934 in three triple turrets
2 forward 1 aft
Secondary 12 x 6.1" (155mm)/60 cal Model 1914 in 4 triple turrets (design)
1 forward, 1 aft, 1 port mid, 1 starboard mid
the 2 midship turrets were removed by 1944
12 x 5" (127mm)/40 cal Model 1928 in 6 twin mounts (design)
24 x 5" (127mm)/40 cal Model 1928 in 12 twin turrets (Apr./44 Yamato)
AAW 24 x 25mm/60 cal AA in 8 triple mounts(design)
72 x 25mm/60 cal AA in 24 triple mounts (Apr./44 Yamato)
96 x 25mm/60 cal AA in 32 triple mounts (Apr./44 Musashi)
87 x 25mm/60 cal AA in 29 triple mounts (Jun./44 Yamato)
146 x 25mm/60 cal AA in 41 triple & 23 single mounts (May./45 Yamato)
4 x 13mm MG (design) removed Apr./44
Main Armament
The Yamato's main armament consisted of nine 18.1 inch guns/45 caliber's in length mounted in three triple turrets, the first triple mounting designed by the Japanese navy following the triple 6.1 inch turret designed for the Mogami class cruisers. No. 1 and No.2 turrets were mounted forward, with No.2 superimposed while No.3 turret was mounted aft.
This arrangement of the main armament was decided after various studies with the main aim of reducing the weight of protection as much as possible.
Moreover her undulating flush weather deck which was lowest in front of turret No.1, made it possible to lower the height of those turrets considerably, thus contributing to overall stability.
  For the secondary armament, the Japanese navy decided to mount four triple turrets of 6.1 inch/55 caliber guns. Two of them were mounted on the centerline, one aft of No.2 main turret and one forward of No.3 main turret., while the remaining two were installed on both sides amidships.
These 6.1 inch turrets had originally been installed on board the Mogami class light cruisers and were removed from them when their main armament was changed to 8 inch guns.
This makeshift measure of employing 6.1 inch gun turrets from light cruisers proved to be a major defect. The 6.1 turrets had only the protection of a light cruiser's turrets.
The two amidships turrets were removed later on to make way for more AA weaponry.
The Yamato's AA weaponry consisted of six twin 5 inch (127mm) guns, three on each side, eight triple .98 inch (25 mm) AA machine guns four on each side and two twin 0.50 inch (13mm) machine guns one on either side of the the mainmast. This was increased substantially during her's and the Musashi's careers.
Terrific Blast Of The 18" Guns
Terrific effects were anticipated on numerous installations aboard the Yamato from gun blast.
While the blast of two 16 inch guns simultaneously firing was reckoned at 19.58 pounds/per square inch at a point 5.9 inch from the gun muzzles, that of the Yamato's three 18 inch guns was approximately 58 pounds/ per square inch.  
This was an immense figure , since it was believed that the blast pressure of 1.5 pounds per square inch was capable of destroying boats on board the ship and that 6.49 pounds per square inch was capable of tearing the cloths from men and renduring them temporally unconscious.
This meant that nowhere on her weather deck would any boat be safe while her main battery was firing;
AA guns as well as AA machine guns had to be protected by shields from the blast.
Vedette boats, other launches and cutters were to be kept inside the boat hangars which were installed on both sides of the stern.
Ventilators on the weather deck were reduced to a minimum and installed at places where the blast was least effective.
The idea of protecting the AA batteries from the blast by shields, enabling them to fire while the main batteries were in use, greatly restricted the installation anti-aircraft weapons.
After the outbreak of war, however the importance of  powerful AA weapons was keenly and later bitterly, realized.
This restriction had to be lifted so that many AA machine guns were installed on the weather deck without a shield to protect them from the blast.
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Radars
Surface Search Type 21
15cm Range Finders
Air Search N/A
Navigation N/A
Fire Control N/A
The Yamato and Musashi were commissioned without any radar sets.
Unlike the ugly "pagoda" masts which had been traditional features of Japanese battleships, the Yamato's tower foremast was much improved and streamlined.
It's frontal and side areas were 521.65 square feet and 1,017 square feet respectively.
The Tower consisted of two concentric cylinders on top of which were large triple 49 foot range finders (one of which was of the inverted stereoscopic image type) and the main armament director.
Precautions were also taken to protect the nerve-center of the ship from strafing of enemy planes.
The inner cylinder 4.9 feet in diameter was made from 20mm DS steel, inside of which ran communications lines.
Space between the outer and inner cylinders was utilized for passages, staff briefing rooms etc.
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Aircraft
Fixed Wing 2 E13A1 Aichi "Jakes"
2 F1M2 Mitsubushi "Petes"
4 max carried
2 catapults aft
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Complement
Design 2200
Wartime 2500+

Specifications

Kaga Class Battleships


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Name Builder LD LCH COM
Kaga Kawasaki Co. Jul.19/20 Nov.17/21 Mar.21/24 as carrier

replaced the damaged battlecruiser Amagi for conversion to a carrier in 1922
sunk at Battle Of Midway Jun.4/42
see Carrier Kaga

Name Builder LD LCH STATUS
Tosa Mitsubishi Co. Feb.16/20 Dec.18/21 cancelled Feb.5/22
used as air & gunnery target ship
sunk as target Feb.9/25


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Displacement

Design 39,900 tons
Maximum 44,500 tons


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Dimensions

Overall 765' (233m)
Waterline 730.0' (223m)
Beam 103' (31.4m)
Draft 31' (9.5m)


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Propulsion

Boilers 12 Kanpon boilers
Turbines Brown Curtis geared turbines
Shafts 4
Horsepower 91,000 shp (design)
Endurance N/A
Speed 26.5 knts (design)


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Armor

Side 11.0" (279mm) with 3.5" (89mm) ends
Deck 1.3"- 4" (33-101mm) (design)  
Turrets 11" (279mm) faces
6" (152mm) sides
Barbettes 11.5" (292mm) sides
Conning Tower 14" (356mm) sides


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Armament

Main Guns 10 x 16.1" (409mm)/45 cal Model 1914 in five twin turrets
2 forward  1 amidships 2 aft
Secondary Guns 20 x 5.5" (140mm)/50 cal Model 1914 in 10 twin mounts (design)  
Heavy AA 4 x 3" (76mm)/40 cal Model 1914 in 4 single mountings
Light AA 8 x 13mm MG
Torpedo Tubes 8 x 24" (610mm) above water (hull mounted)


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3 (design)


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Complement

Design 1300
Usual 1400

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Specifications

Modified Kii 'Number 13' Project Battleships


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Name Builder STATUS
#13 Yokosuka Navy Yard cancelled Nov.19/23 under Washington Naval Treaty  
#14 Kure Navy Yard cancelled Nov.19/23 under Washington Naval Treaty  
#15 Mitsubushi Co cancelled Nov.19/23 under Washington Naval Treaty  
#16 .Kawasaki Co. cancelled Nov.19/23 under Washington Naval Treaty  


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Displacement

Normal 47,500 tons  
Full Load 53,000 tons


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Dimensions

Overall 915' (279m)
Waterline 875.0' (267m)
Beam 101' (30.8m)
Draft 31.5' (9.6m)


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Propulsion

Boilers 22 Kanpon boilers  
Turbines Parsons geared turbines
Shafts 4
Horsepower 150,000 shp
Endurance N/A
Speed 30 knts


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Armor

Side 13.0" (330mm) with 5" (127mm) ends
Deck 1.7"- 5" (43-127mm)
Turrets 14" (356mm) faces
5" (127mm) sides
Barbettes 11.5"-9" (292-229mm) sides
Conning Tower 14"-10" (356-254mm) sides


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Armament

Main Guns 8 x 18.1" (460mm)/45 cal Model 1916 in four twin turrets
2 forward  2 aft
Secondary Guns 16 x 5.5" (140mm)/50 cal Model 1914 in 16 single mounts
Heavy AA 4 x 4.7" (119mm)/45 cal Model 1914 in 4 single mountings
Light AA 8 x 13mm MG
Torpedo Tubes 8 x 24" (610mm) in twin mounts above water (hull mounted)


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3


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Complement

Design 1450
Usual 1650

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Specifications

Kii Project Battleships


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Name Builder STAT
Kii Kure Navy Yard cancelled Apr.24/24 under Washington Naval Treaty  
Owari Yokosuka Navy Yard cancelled Apr.24/24 under Washington Naval Treaty  
#11 Kawasaki Co. cancelled Nov.19/23 under Washington Naval Treaty  
#12 Mitsubushi Co. cancelled Nov.19/23 under Washington Naval Treaty  


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Displacement

Design 41,400 tons  
Normal 42,700 tons
Full Load 48,550 tons


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Dimensions

Overall 827' (252m)
Waterline 820' (250m)
Beam 101' (30.8m)
Draft 30.5' (9.3m)


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Propulsion

Boilers 20 Kanpon boilers  
Turbines Parsons geared turbines
Shafts 4
Horsepower 131,200 shp
Endurance 8,000 NM @ 14 knts
Speed 29.75 knts


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Armor

Side 11.5" (292mm) with 4" (101mm) ends
Deck 1.3"- 4" (33-101mm)
Turrets 11" (279mm) faces
5" (127mm) sides
Barbettes 11.5"-9" (292-229mm) sides
Conning Tower 14"-10" (356-254mm)


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Armament

Main Guns 10 x 16.1" (409mm)/45 cal Model 1914 in five twin turrets
2 forward  1 amidships 2 aft
Secondary Guns 16-20 x 5.5" (140mm)/50 cal Model 1914 in 16-20 single mounts
Heavy AA 4 x 4.7" (119mm)/45 cal Model 1914 in 4 single mountings
Light AA 8 x 13mm MG
Torpedo Tubes 8 x 24" (610mm) in 4 twin mounts above water (hull mounted)


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3 (design)  


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Complement

Design 1360
Usual 1450

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Specifications

Nagato Class Battleships


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Name Builder LD LCH COM
Nagato Kure Navy Yard Aug.28./17 Nov.9/19 Nov.25/20

underwent reconstruction in mid 1930's
included removal of one funnel and replacement by a large bridge structure
severely damaged at Leyte Gulf
out of action for remainder of war and docked at Yokosuka
war reparation to the US in 1945
capsized and sank Jul.29/46 after Operation Baker A-bomb test
remains at Bikini Atoll

Name Builder LD LCH COM
Mutsu Yokosuka Navy Yard Jun.1./18 May.31/20 Oct.24/21

underwent reconstruction in mid 1930's
included removal of one funnel and replacement by a large bridge structure
blew up and sank Jun.8/43 in Hiroshima Bay
probably caused by Cordite charges overheating
remains there.


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Displacement

Design 33,900 tons (design)
39,250 tons (after 1930s reconstruction)
Maximum 38,625 tons (design)
43,580 tons (after 1930's reconstruction)


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Dimensions

Overall 700' (213.4m) (design)
739' (225m) (after 1930's reconstruction)
Waterline n/a
Beam 95.3' (29m) (design)
108' (33m) bulges (after 1930's reconstruction)
Draft 29.7' (9m) (design)
31.5' (9.6m) (after 1930's reconstruction)


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Propulsion

Boilers 21 Kanpon boilers
reboilered with 10 boilers in 1930's reconstruction
Turbines Brown Curtis geared turbines  
Shafts 4
Horsepower 80,000 shp (design)
91,000 shp after 1930's reconstruction
Endurance N/A
Speed 26.5 knts (design)
24.9 knots after 1930's reconstruction


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Armor

Side 12.0" (305mm) with 3.5" (89mm) ends
Deck 1.6"- 3" (41-76mm) (design)
4.7"-7.3" (119-185mm) after 1930s reconstruction
Turrets 14" (356mm) faces
8" (203mm) sides
Barbettes 11.5" (292mm) sides
Conning Tower 14" (356mm) sides


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Armament

Main Battery 8 x 16.1" (409mm)/45 cal Model 1914 in four twin turrets
2 forward  2 aft
Secondary 20 x 5.5" (140mm)/50 cal Model 1914 in 20 single casemate mounts (design)
reduced to 18 in 1930s reconstruction
8 x 5" (127mm)/40 cal Model 1928 in 4 twin mounts added in 1930s reconstruction
AAW 4 x 3" (76mm)/40 cal Model 1914 in 4 single mountings
20 x 25mm/60 cal AA added in 1930s reconstruction
98 x 25mm/60 cal AA during WWII
4-8 x 13mm MG (design) removed Apr./44
Torpedoes 8 x 24" (610mm) 4 above water (hull mounted), 4 submerged


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3


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Complement

Design 1350
Usual 1480

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Specifications

Ise Class Battleships


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Name Builder LD LCH COM
Ise Kawasaki Co. May.10/15 Nov.12/16 Dec.15/17

extensively reconstructed in mid 1930's
converted to hybrid battleship-carriers ending Sep./43
bombed and sank Jul.28/45 near Kure Harbor
scrapped 1947

Name Builder LD LCH COM
Hyuga Mitsubushi Co. May.6/15 Jan.27/17 Apr.30/18

extensively reconstructed in mid 1930's
converted to hybrid battleship-carriers ending Nov./43
bombed and severely damaged Jul.24/45 by US aircraft
bombed again and sunk Jul.28/45 near Kure
Scrapped 1947  


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Displacement

Design 29,900 tons
32,900 tons (after 1930's reconstruction)
33,800 tons (after conversion to battleship-carriers)
Maximum 36,650 tons (design)
38,500 tons (after 1930's reconstruction)
39,680 tons (after conversion to battleship-carriers)


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Dimensions

Overall 675' (206m) (design)
710' (216.4m) (after 1930's reconstruction)
721.3' (220m) (after conversion to battleship-carriers)
Waterline

Specifications

Fuso Class Battleships


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Name Builder LD LCH COM
Fuso Kure Navy Yard Mar.11/12 Mar.28/14 Nov.18/15

underwent major reconstruction early 1930's
included removal of one funnel and replacement with a massive bridge structure
sunk Oct.25/44 at Battle of Surigao Strait by destroyer & aircraft torpedoes and bombs

Name Builder LD LCH COM
Yamashiro Yokosuka Navy Yard Nov.20/13 Nov.3/15 Mar.31/17

underwent reconstruction early 1930's
underwent second reconstruction Feb./35
included removal of one funnel and replacement with a massive bridge structure
recieved 1 torpedo hit from destroyers at Battle of Surigao Strait.
shelled into a hulk Oct.25/44 by Pearl Harbor veteran battleships and later sank


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Displacement

Design 30,900 tons (design)
34,300 tons (after 1930s reconstruction)
Maximum 35,900 tons (design)
39,500 tons (after 1930's reconstruction)


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Dimensions

Overall 665' (202.7m) (design)
698' (212.7m) (after 1930's reconstruction)
Waterline n/a
Beam 94' (28.7m) (design)
101' (30.8m) (after 1930's reconstruction)
Draft 28.3' (8.6m) (design)
31' (9.4m) (after 1930's reconstruction)


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Propulsion

Boilers 24 Kanpon boilers
reboilered with 6 boilers in 1930's reconstruction
Turbines Brown Curtis geared turbines  
Shafts 4
Horsepower 40,000 shp (design)
78,000 shp (after 1930's reconstruction)
Endurance N/A
Speed 22.5 knts (design)
24.7 knots (after 1930's reconstruction)


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Armor

Side 12.0" (305mm) with 3.5" (89mm) ends
Deck 1.3"- 3" (33-76mm) (design)
3.8"-6.5" (97-165mm) after 1930s reconstruction
Turrets 12" (305mm) faces
6" (152mm) sides
Barbettes 11.5" (292mm) sides
Conning Tower 13" (330mm) sides


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Armament

Main Guns 12 x 14" (356mm)/45 cal Model 1908 in six twin turrets
2 forward  2 amidships 2 aft
Secondary Guns 16 x 6" (152mm)/50 cal Model 1908 in 16 single casemate mounts (design)
reduced to 14 in 1930s reconstruction
4 x 5.5" (140mm)/50 cal Model 1914 in 4 single mounts (design)
8 x 5" (127mm)/40 cal Model 1928 in 4 twin mounts added in 1930s reconstruction
an additional 8 were mounted in conversion to battleship-carriers
Heavy AA 4 x 3"/40 cal 41st year type (design)
Light AA 16 x 25mm/60 cal AA added in 1930s reconstruction
38+ x 25mm/60 cal AA in WWII
4-8 x 13mm MG (design) removed Apr./44
Torpedo Tubes 6 x 21" (533mm) submerged
may have been removed


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3


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Complement

Design 1125
Usual 1350

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Specifications

Kongo Class Battlecruisers/Battleships


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Name Builder LD LCH COM
Kongo Vickers-Barrow U.K. Jan.17/11 May.18/12 Aug.16/13

reconstructed as battleship late 1920's
reconstructed second time mid 1930's
blew up and sank Nov.21/44 7 hours after being hit by 3 torpedoes fired by USS Sealion  

Name Builder LD LCH COM
Hiei Yokosuka Navy Yard Nov.4/11 Nov.21/12 Aug.4/14

converted to training ship late 1920's
converted back to battleship standard late 1930's
Severely damaged by 5" & 8" shellfire at the Battle of Savo Island Nov.13/42.
USS Enterprise CV-6 aircraft damaged her more and she was ordered scuttled

Name Builder LD LCH COM
Haruna Kawasaki Co. Mar.16/12 Dec.14/13 Apr.19/15

reconstructed as battleship late 1927-28
reconstructed second time mid 1930's
bombed & badly damaged at Kure Harbour Jul.19/45
Attacked again on Jul.28/45 and sank at her moorings.
Scrapped 1946

Name Builder LD LCH COM
Kirishima Mitsubushi Co. Mar.17/12 Dec.1/13 Apr.19/15

reconstructed as battleship late 1920's
reconstructed second time mid 1930's
scuttled by crew Nov.14/42 in battle with USS Washington & South Dakota near Solomon Islands
after being hit by 9 x 16 inch & 40 x 5 inch shells


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Displacement

Design 26,000 tons  
Standard 29,330 tons(design)
32,000 tons (second reconstruction)
Maximum 31,000 tons(design)
35,560 tons-36,650 tons(second reconstruction)


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Dimensions

Overall 704' (214.6m) (design)
738' (225m) (after 1930's reconstruction)
Waterline 630.0' (192m)
Beam 95' (28.9m) (design)
104' (31.7m) (after 1930's reconstruction)
Draft 28.5' (8.7m) (design)
32' (9.8m) (after 1930's reconstruction)


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Propulsion

Boilers 10 Babcock & Wilcox boilers (design)
reboilered with 10(16 in Haruna) Kanpon boilers
Turbines Parsons geared turbines (Kongo & Kirishima)
Curtis geared turbines (Hiei & Haruna)
Shafts 4
Horsepower 64,000 shp (design)
136,000 shp (after reboilering)
Endurance N/A
Speed 27.54 knts max trials (design)
30.5 knots (after reboilering)
29.5 knts (after second reconstruction)


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Armor

Side 8" (203mm) with 3" (76mm) ends
6" (152mm) upper belt
Deck 1.65"- 2.75" (42-70mm) (design)
3.8"-6.5" (96.5-165mm) (after 1930's refit)
Turrets 9" (229mm) faces (design)
6" (152mm) sides
Barbettes 10" (254mm) sides
Conning Tower 10.5" (267mm) sides


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Armament

Main Guns 8 x 14" (356mm)/45 cal M1908 in six twin turrets Vickers type in Kongo
2 forward 2 aft
changed to Japan 12 ME131 43rd year Type in 1930s
changed to 41st year Type in 1939 (Hiei only)
Secondary Guns 16 x 3"/40 cal 41st year type (design)
reduced to 4 x 3"/40 cal M1928 DP
7 in Kongo after reconstruction
16 x 6"/50 cal M1908 (after reconstruction)
reduced to 8 in WWII
12 x 5"/40 cal M1928 added in WWII
AAW 3 x NE-NDO Shiki 80mm AA (design)
up to 100 x 25mm/60 cal AA (WWII)
8 x 13mm/76 cal AA
Torpedo Tubes 2 x 21" (533mm) submerged
with 8 x 6th Year Type torpedoes


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Radars

Surface Search N/A
Air Search N/A
Fire Control N/A


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Aircraft

Fixed Wing 3 floatplanes


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Complement

Design 1100
Wartime 1500

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