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Part 1 - The Improved Nagato Designs
Design A-115
www.deviantart.com
Battleship Design A-115 was the first post Nagato battleship design of the IJN. It contains some novel changes compared to her predecessor, including closely arranged funnels likely to reduce the possibility of spotting the ship's direction armour wise a thinner but heavily, 25° inclined belt armour was introduced providing better protection at longer ranges then the vertical 305mm of the Nagato and which was consistent with the requirement of the Admiralty that all subsequent battleship type had to be stronger in one or more aspect then the previous one. But not only the armour was improved on this design but the speed too was increased considerably to 30knots or 56km/h over the already good speed of 26,5knots or 49km/h of the Nagatos. This of course required a longer sleek hull and bigger engines to achieve. The 25m extra length and half a meter wider beam allowed the install of almost 50% more (or in the case of the following design A-116 exactly 50% more) engine power into the hull to reach the desired speed. Despite the longer hull and more powerful engines the displacement was only risen by only 900tons showing how much weight can be saved by reducing the armour and incline it!
The design had the following characteristics:
Dimensions: 224,02 (pp) x 237,74 (wl) x 240,18 (oa) x 29,57 x 8,53 meters
Displacement: 34.700tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 113.000shp 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
Data tables:
iiif.dl.itc.u-tokyo.ac.jp
Design A-116
www.deviantart.com
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:
iiif.dl.itc.u-tokyo.ac.jp
Funnel protection scheme:
iiif.dl.itc.u-tokyo.ac.jp
Data tables:
iiif.dl.itc.u-tokyo.ac.jp
Design A-117
www.deviantart.com
Design A-117 was the faster version of the very first post Nagato battleship Design: A-115. While A-115 was designed for 30knots or 56km/h, A-117 destined for 32knots or 59km/h basically a faster Nagato a very true fast battleship combining fast battlecruiser type speed with good armour and excellent armament! The armour scheme copies that of A-115 together with the thin 1" funnel protection. But the extra two knots take at a cost: more then 13m more length, more then 30.000shp engine power and almost an extra 2.500tons of displacement.
The design had the following characteristics:
Dimensions: 237,74 (pp) x 253,9 (oa) x 29,57 x 8,76 meters
Displacement: 37.100tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 145.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 59km/h (32knots)
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
Data tables:
iiif.dl.itc.u-tokyo.ac.jp
Design A-118
www.deviantart.com
Design A-118 was the last 4 turreted battleship design of the Imperial Japanese Navy and essentially a lengthened version of the previous A-117 with much stronger funnel base protection. While the designs A-115 and 116 was the Fast Nagato designs, together with A-117, A-118 too was an even faster Nagato type battleship with 32knots or 59km/h maximum speed and like how A-116 was companion design to A-115, A-118 too was a companion design to A-117. The diference being the even numbers had only 1" or 25mm armour plates around the funnel uptakes, the uneven proposals had a very thick 6 to 9" or 152-229mm platings! This resulted in an a base increase of probably around 1.000-1.250tons of armour alone and to maintain the desired high speed the hull was lengthened, the engine power increased by 5.0000shp to 150.000shp and displacement risen by 2.300tons over A-117.
None the less we got a nice sleek good looking very fast battleship which could catch even battlecruisers and fight equally with battleships!
The design had the following characteristics:
Dimensions: 243,84 (pp) x 260,00 (oa) x 29,57 x 9,14 meters
Displacement: 39.400tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 150.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 59km/h (32knots)
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:
iiif.dl.itc.u-tokyo.ac.jp
Data tables:
iiif.dl.itc.u-tokyo.ac.jp
Design A-115
IJN Battleship Design A-115 by Tzoli on DeviantArt
www.deviantart.com
Battleship Design A-115 was the first post Nagato battleship design of the IJN. It contains some novel changes compared to her predecessor, including closely arranged funnels likely to reduce the possibility of spotting the ship's direction armour wise a thinner but heavily, 25° inclined belt armour was introduced providing better protection at longer ranges then the vertical 305mm of the Nagato and which was consistent with the requirement of the Admiralty that all subsequent battleship type had to be stronger in one or more aspect then the previous one. But not only the armour was improved on this design but the speed too was increased considerably to 30knots or 56km/h over the already good speed of 26,5knots or 49km/h of the Nagatos. This of course required a longer sleek hull and bigger engines to achieve. The 25m extra length and half a meter wider beam allowed the install of almost 50% more (or in the case of the following design A-116 exactly 50% more) engine power into the hull to reach the desired speed. Despite the longer hull and more powerful engines the displacement was only risen by only 900tons showing how much weight can be saved by reducing the armour and incline it!
The design had the following characteristics:
Dimensions: 224,02 (pp) x 237,74 (wl) x 240,18 (oa) x 29,57 x 8,53 meters
Displacement: 34.700tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 113.000shp 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
Data tables:
平賀譲デジタルアーカイブ · Particulars “Fuso”“Hiei” and New designs(A124 B61) 1917.12.10 · 東京大学学術資産等アーカイブズ共用サーバ
Design A-116
IJN Battleship Design A-116 by Tzoli on DeviantArt
www.deviantart.com
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:
平賀譲デジタルアーカイブ · ?A116” BATTLE SHIP · 東京大学学術資産等アーカイブズ共用サーバ
平賀譲デジタルアーカイブ · A116 120,000 S.H.P. Funnel protection 5年12月会田技師 · 東京大学学術資産等アーカイブズ共用サーバ
平賀譲デジタルアーカイブ · Particulars “Fuso”“Hiei” and New designs(A124 B61) 1917.12.10 · 東京大学学術資産等アーカイブズ共用サーバ
Design A-117
IJN Battleship Design A-117 by Tzoli on DeviantArt
www.deviantart.com
Design A-117 was the faster version of the very first post Nagato battleship Design: A-115. While A-115 was designed for 30knots or 56km/h, A-117 destined for 32knots or 59km/h basically a faster Nagato a very true fast battleship combining fast battlecruiser type speed with good armour and excellent armament! The armour scheme copies that of A-115 together with the thin 1" funnel protection. But the extra two knots take at a cost: more then 13m more length, more then 30.000shp engine power and almost an extra 2.500tons of displacement.
The design had the following characteristics:
Dimensions: 237,74 (pp) x 253,9 (oa) x 29,57 x 8,76 meters
Displacement: 37.100tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 145.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 59km/h (32knots)
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
Data tables:
平賀譲デジタルアーカイブ · Particulars “Fuso”“Hiei” and New designs(A124 B61) 1917.12.10 · 東京大学学術資産等アーカイブズ共用サーバ
Design A-118
IJN Battleship Design A-118 by Tzoli on DeviantArt
www.deviantart.com
Design A-118 was the last 4 turreted battleship design of the Imperial Japanese Navy and essentially a lengthened version of the previous A-117 with much stronger funnel base protection. While the designs A-115 and 116 was the Fast Nagato designs, together with A-117, A-118 too was an even faster Nagato type battleship with 32knots or 59km/h maximum speed and like how A-116 was companion design to A-115, A-118 too was a companion design to A-117. The diference being the even numbers had only 1" or 25mm armour plates around the funnel uptakes, the uneven proposals had a very thick 6 to 9" or 152-229mm platings! This resulted in an a base increase of probably around 1.000-1.250tons of armour alone and to maintain the desired high speed the hull was lengthened, the engine power increased by 5.0000shp to 150.000shp and displacement risen by 2.300tons over A-117.
None the less we got a nice sleek good looking very fast battleship which could catch even battlecruisers and fight equally with battleships!
The design had the following characteristics:
Dimensions: 243,84 (pp) x 260,00 (oa) x 29,57 x 9,14 meters
Displacement: 39.400tons (standard)
Armour: 229mm Belt inclined at 25 degrees, 76mm Deck, 51mm at Machinery 76mm at Magazine Slopes
Engines: 150.000shp Gihon Steam Turbines, 4 shafts
Range: 10.200km at 30km/h (5.500nm at 16knots)
Speed: 59km/h (32knots)
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:
