IJN Battleship Design A-116

Together with the previous Design A-115, A-116 was a fast 30knots / 56km/h Nagato type battleship, but while A-115 copied over the thin funnel protection of Nagato of only 1inch or 25mm plates, A-116 provides a substantially thicker protection over this area of 6-9" or 152-229mm armour plates which resulted in a significant 2.000tons increase in displacement together with an extra 7.000ship engine pwoer required to maintain the desired speed! The belt armour remains unchanged as introduced in A-115 having 229mm belt thickness which indeed looks thin for a late WW1 era battleship but if take into account that it was to be inclined at 25° to the vertical, this angled surface provides much better protection for long range gunnery fire.

The design had the following characteristics:
Dimensions: 224,02 (pp) x 237,74 (wl) x 240,18 (oa) x 29,57 x 9,14 meters
Displacement: 36.700tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 120.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 56km/h (30knots)
Armaments:
4x2 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 53cm Above Water Torpedo Tubes

Official sketch drawing:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/5fc1c832-b8ed-4566-9e9b-9376aa4b97d7#?c=0&m=0&s=0&cv=0&xywh=-1118%2C-274%2C9179%2C5475

Funnel protection scheme:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/3d97a5d0-0eee-4f82-ac12-42a06b4c8810#?c=0&m=0&s=0&cv=1&xywh=-659%2C0%2C8261%2C4927

Data tables:
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/d059f655-21b8-4530-8979-ce9ac0733c10#?c=0&m=0&s=0&cv=1&xywh=3593%2C85%2C2790%2C4678&r=270
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/hiraga/document/92cdfb52-21f7-4942-98e3-643167773975#?c=0&m=0&s=0&cv=3&xywh=1150%2C722%2C2053%2C3442&r=90