IJN Battleship Design A-127
While many sources states that the design number A-127 was for the Kaga/Tosa class, the documents, drawings and data tables in the Yuzuru Hiraga archive states otherwise. Design A-127 while having all the major characteristics of the final Tosa class as laid down like the number of torpedo tubes primary, secondary and AA guns number position and arrangement there are subtle structural differences not to mention A-127 was shorter by a few meters. If you put the two drawings next or above each other these differences will show. But apart from the length of the hull the most prominent difference was the usage of the circular funnel first appeared in the A-126 series but was finally remodelled sometime later. Less noticeable but still distinct are the 1st deck shape mostly around the casemates and around the blast shields aft.
The design had the following characteristics:
Dimensions: 214,88 (pp) x 238,6 (wl) x 231,1 (oa) x 30,5 x 9,4 meters
Displacement: 39.900tons (standard)
Armour: 280mm Belt inclined to 15 degrees, 102mm Deck, 70mm 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/e406e39c-d4d0-4b63-b9fd-af22842d416a
Turret arrangements:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/ffe54f60-5c64-496f-9887-b14030a47103
