IJN Battleship Design A-126
A-126 is the baseline of the next series of designs. It has the same main turret layout as A-125 but the armour layout and thickness was vastly improved but to maintain speed the hull had to lengthened together with a 10% increase in engine power from 80.000 to 88.000shp but why A-125 was described as a modified Mutsu (despite the hull shape was not that of the Nagato though the dimensions are the same) A-126 shows a much different hull shape. Another unique feature of this design and the consequent proposals were to usage of large circular funnel.
The design had the following characteristics:
Dimensions: 213,36 (pp) x 227,07 (wl) x 228,4 (oa) x 32,7 x 9,3 meters
Displacement: 39.300tons (standard)
Armour: 292mm Belt inclined to 16,5 degrees, 102mm Deck, 76mm Slopes
Engines: 88.000shp Curtis Steam Turbines, 4 shafts
Range: 12.000km at 30km/h (5.500nm at 16knots)
Speed: 49km/h (26,5knots)
Armaments:
5x2 410mm/45 Type 3 / 3rd Year Type Cannons,
20x1 140mm/50 Type 3 / 3rd Year Type Guns,
4x1 76mm/40 Type 3 / 3rd Year Type AA Guns,
4x1 61cm Above Water and 4x1 Underwater Torpedo Tubes
Official drawing:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/2c2a7ee4-c774-4acd-9424-fd0a14132f29
Turret arrangements:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/ffe54f60-5c64-496f-9887-b14030a47103
Variant A was the most distinguishable design of the A-126 series. By placing the 3rd turret between the boilers and turbines essentially separating the two which provides protection, but this arrangement meant that the turret had to be risen on the same height as the 2nd and 3rd to provide space for the ship's boat stowage. This resulted in the unique layout of the 1st deck separated by the 3rd turret's barbette yet not connected to it like on Amagi and Kii and also the hull was required to be lengthened by a few meters.
The design had the following characteristics:
Dimensions: 214,88 (pp) x 228,60 (wl) x 230,2 (oa) x 32,7 x 9,3 meters
Displacement: 39.000tons (standard)
Armour: 292mm Belt inclined to 16,5 degrees, 102mm Deck, 76mm Slopes
Engines: 91.000shp Curtis Steam Turbines, 4 shafts
Range: 12.000km at 30km/h (5.500nm at 16knots)
Speed: 49km/h (26,5knots)
Armaments:
5x2 410mm/45 Type 3 / 3rd Year Type Cannons,
20x1 140mm/50 Type 3 / 3rd Year Type Guns,
4x1 76mm/40 Type 3 / 3rd Year Type AA Guns,
4x1 61cm Above Water and 4x1 Underwater Torpedo Tubes
Official drawing:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/3b4146f8-1d0b-418a-bbaa-0e5356b3543c
Turret arrangements:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/ffe54f60-5c64-496f-9887-b14030a47103
Variant B was more reminiscent of the baseline A-126 design with the 3rd turret facing forward then to the A variant where the 3rd turretd was placed on an elevated position between the funnel and the mainmast. But here the 3rd turret had wider spacing from the aft pair and thus drastically reducing the effect of a lucky hit disabling all 3 turrets aft. The 1st deck was also mimicking the baseline design in both shape and arrangement.
The design had the following characteristics:
Dimensions: 213,36 (pp) x 227,07 (wl) x 229,5 (oa) x 32,7 x 9,3 meters
Displacement: 39.650tons (standard)
Armour: 292mm Belt inclined to 16,5 degrees, 102mm Deck, 76mm Slopes
Engines: 90.000shp Curtis Steam Turbines, 4 shafts
Range: 12.000km at 30km/h (5.500nm at 16knots)
Speed: 49km/h (26,5knots)
Armaments:
5x2 410mm/45 Type 3 / 3rd Year Type Cannons,
20x1 140mm/50 Type 3 / 3rd Year Type Guns,
4x1 76mm/40 Type 3 / 3rd Year Type AA Guns,
4x1 61cm Above Water and 4x1 Underwater Torpedo Tubes
Official drawing:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/8e78da61-573e-4cec-a1f3-89384d4ff730
Turret arrangements:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/ffe54f60-5c64-496f-9887-b14030a47103
Variant C was the 3rd sub version of the A-126 design where the 3rd turret was arranged reminiscent of the final design and of the consequent classes (Amagi, Kii ) eg facing aft. The 1st deck shape and arrangement was also different from the baseline A-126 and from the previous B variant and was used as a basis for the next design of A-127. The large circular shaped funnel still remains but the armour layout follows that of the A variant.
The design had the following characteristics:
Dimensions: 213,36 (pp) x 227,07 (wl) x 229,5 (oa) x 32,7 x 9,3 meters
Displacement: 39.650tons (standard)
Armour: 292mm Belt inclined to 16,5 degrees, 102mm Deck, 76mm Slopes
Engines: 90.000shp
