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Yamato Preliminary A-140K series
The K versions of the Yamato preliminaries was a somewhat more extreme approach to weight saving.
Indeed the K variants were the smallest versions among the multitude of designs leading to the final Yamato class but this came at a price, a price of protection.
All the K variants feature 8 46cm cannons in 2 triple and 1 twin turrets small size and reduced armour which was designed to protect against 41cm shells instead of the previous design where they were protected against their own shells. Basically the K feature the same firepower as the A2 and B2 variants, but the protection scheme of the J versions with K being the slowest of them all, while maintaining a displacement of a mere 50.000tons!
On K1 variant the same weight saving measures were taken, so 8 guns instead of 9, 3 triple 155mm secondary gun turrets and armour protection against only 41cm shells. But in K1 the speed was increased to 48km/h (or 26knots) which resulted in a larger and heavier hull. Both the engine power and the hull length was increased to achieve the desired speed.
K2 was a further lengthened version because most likely the designers realised that 220meters was rather too short for a battleship armed with 8x 46cm cannons! the extra length also allowed more space for the engines increasing it to 130.000shp and speed to 52km/h (or 28knots) resulting in a much faster and better design, but still feature the reduced belt thickness of around 380mm, but this extra speed and larger hull meant the heaviest of the K variants of 53.900tons, barely smaller than the A-140J2 version with it's 3 tripe 41cm cannons
K3 was the known final K variant of the Yamato preliminaries, a more streamlined version of K1 with elements taken from K2
and a slightly increased engine power together with a hull length increase, otherwise the same as the other K versions.
Because the hull was so small I departed from the hanger / ramp approach of the previous designs and adopted a more Yamato-ish aft section with a hanger opening to a loading space where the crane could lift the aircrafts up to the catapults ad aircraft deck. This saved precious space for the superstructure and main weaponry which took most of the upper deck space.
The designs had the following characteristics:
A-140K:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K-749446900
A-140K1:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K1-751255857
A-140K2:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K2-751481076
A-140K3:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K3-751636685
Data table showing the various variants:
https://i.imgur.com/zsBKwfN.jpg
http://mltr.ganriki.net/faq08p14e22b25.html
Indeed the K variants were the smallest versions among the multitude of designs leading to the final Yamato class but this came at a price, a price of protection.
All the K variants feature 8 46cm cannons in 2 triple and 1 twin turrets small size and reduced armour which was designed to protect against 41cm shells instead of the previous design where they were protected against their own shells. Basically the K feature the same firepower as the A2 and B2 variants, but the protection scheme of the J versions with K being the slowest of them all, while maintaining a displacement of a mere 50.000tons!
On K1 variant the same weight saving measures were taken, so 8 guns instead of 9, 3 triple 155mm secondary gun turrets and armour protection against only 41cm shells. But in K1 the speed was increased to 48km/h (or 26knots) which resulted in a larger and heavier hull. Both the engine power and the hull length was increased to achieve the desired speed.
K2 was a further lengthened version because most likely the designers realised that 220meters was rather too short for a battleship armed with 8x 46cm cannons! the extra length also allowed more space for the engines increasing it to 130.000shp and speed to 52km/h (or 28knots) resulting in a much faster and better design, but still feature the reduced belt thickness of around 380mm, but this extra speed and larger hull meant the heaviest of the K variants of 53.900tons, barely smaller than the A-140J2 version with it's 3 tripe 41cm cannons
K3 was the known final K variant of the Yamato preliminaries, a more streamlined version of K1 with elements taken from K2
and a slightly increased engine power together with a hull length increase, otherwise the same as the other K versions.
Because the hull was so small I departed from the hanger / ramp approach of the previous designs and adopted a more Yamato-ish aft section with a hanger opening to a loading space where the crane could lift the aircrafts up to the catapults ad aircraft deck. This saved precious space for the superstructure and main weaponry which took most of the upper deck space.
The designs had the following characteristics:
A-140K:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K-749446900
A-140K1:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K1-751255857
A-140K2:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K2-751481076
A-140K3:
https://www.deviantart.com/tzoli/art/Yamato-Preliminary-Design-A-140K3-751636685
Data table showing the various variants:
https://i.imgur.com/zsBKwfN.jpg
http://mltr.ganriki.net/faq08p14e22b25.html
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2018-08-20 05:01
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