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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 13th, 2015, 6:48 pm
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Kashino Class Light Cruiser (part 1, 1920-1930)

In order to provide DesRon flaghips for the many destroyers that were to come, a class of small and fast cruisers was ordered after the end of WWI.
The design phase went quite fast, as ultimately the Kashinos were almost a carbon copy of the Tenryuu class cruisers. Overall Tenryu and Kashino shared the same hull, main armament and engines, enjoying the same 33knot top speed and 5.000 nautical-miles range. The differencies were mainly in external appearance.
The Kashino class featured walkways over the two triple 533mm torpedo sets. The aft superstructure was slightly larger, while the foremast housing the 90cm searchlight and the fire control top had a shorter height. Boiler and engine room vents were also arranged differently, mainly on the side of the midship deckhouses. Rails were also fitted on the quarterdeck for the provisional plan to fit the cruisers with minelaying capabilities, but this eventually was never materialized.
All six units were ordered and built at Toumachi Naval Arsenal between 1918 and 1922. The first two, Kashino and Asakura, were completed to the original design and were in service by 1920.
[ img ]
The two subsequent ships, Okazaki and Izayoi, were laid down in 1919 to a modified design: the fire control top was reinforced and slightly lowered by adding diagonal legs to the foremast, effectively turning it from a simple pole-mast to a full tripod, in a way similar to the Japanese Kuma and Nagara classes, the steam pipe and fog horn layout on the fore funnel was also slightly different. Both were in service by 1921.
[ img ]
The fifth and sixth units, Kompaku and Saigyouji, had the forward part of the bridge enclosed and given windows to offer more protection against the elements to the commanding crew, the fire control top was also slightly enlarged. Th spotting platform at the top of the foremast was removed, replaced with a lookout platform with binoculars fitted just below the starfish, steam pipes on the funnels were heightened, and the torpedo tube rollers were raised by almost a foot to protect the equipment from sprays (all features that were eventually observed and implemented by the IJN too). Finally and experimental RDF antenna was fitted on the aft superstrucutre, forcing the relocation of the 2,5m rangefinder to a new platform. Both were completed by 1922, Kompaku in January and Saigyouji in April.
[ img ]
During the 20's all six units acted as Suirai Sentai flagships. Asakura was fitted with the tripod mast during a 1925-1926 refit after she nearly grounded off Shinjima during a storm. No other modifications were made on the class before the early 30's.


Ships in class: (laid down-launched-commissioned - fate)

Kashino 1918-1919-1920 - ?
Asakura 1918-1919-1920 - ?
Okazaki 1919-1920-1921 - ?
Izayoi 1919-1920-1921 - ?
Kompaku 1920-1921-1922 - ?
Saigyouji 1920-1921-1922 - ?

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Last edited by BB1987 on June 13th, 2016, 6:44 pm, edited 4 times in total.

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 13th, 2015, 6:51 pm
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Very nice!

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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 13th, 2015, 7:29 pm
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Great work. :)

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 13th, 2015, 9:18 pm
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Sato Class Detroyer (Part 1, 1922-1930):

Originally laid down as the unnamed Kuchikukan 23, Sato was to be the lead unit of a 26-unit strong class of Destroyers. Itself an updated and modified version of the Kuchikukan 14 class, Sato featured the same armament of four 120mm guns and three twin 533mm torpedo tubes but had the hull stretched by 2,1m for an overall lenght of 106,8 and a standard displacement of 1.353Tons. This was meant to allow for extra fuel bunkerage to be carried in order to gain more range over the Kuckicukan 14 class which lacked in this field. The center funnel was also slightly enlarged to allow for a better exhaust from the boiler rooms.
Sato, which being so named during construction became the first Koko no Kaigun destroyer to recieve an actual name, was laid down at Toumachi Naval Arsenal in 1920 and Launched on January 1st 1922. Already almost complete, she was commissioned in record-breaking time just over a month later on february 4th and assigned to Kuchikutai 4 (Destroyer division) even though she was still running her trials.
Her top speed was 34,2knots, some 0,7 less than the Kuchikukan 14 because of the increase of displacement, but range had risen up from 2.600 to 2.800 nautical miles.
When the Washington Naval Treaty was signed, four more units, Destroyers 24 through 27 (still unnamed) were under construction at Hoshiguma Navy Yard (number 25,26), Kousaten navy Yard (number 27) and Kumoi Arsenal (number 24). All the other units up to Destroyer 48 had already been ordered and allocated to their respective building yard.
[ img ]
Still, a number of coupled factors eventually led to the premature demise of the Sato Class: Firstly, the Washington Naval Treaty itself almost grinded to an halt Koko's capital ship contruction plan, reducing the immediate need of new Destroyers that had to be built. Secondly, Sato sea trials showed that while the range had improved over the previous class it was still lacking when compared to other new classes of Destroyers, and the drop in top speed to just over 34knots when other Navies were developing 36 and 37knots units was deemed unacceptable. Finally, Kuckikukans 14 were already themselves a 7,8m stretch over the Japanese Isokazes on which they were based, Sato then added another 2 meters to that, bringing the total stretch to nearly 10 meters without increasing either beam or draft. This resulted in an extremely long and thin hull that was deemed structuraly unsound for prolonged blue-water operations in rough seas.
So, within two months of the Washington Naval Treaty ratification, the whole Sato Class plan was canceled and shelved: The four units under construction were broken up in the yards, the other 21 units already allocated were reordered on a smaller design that later became the Shion Class and as first batch of the larger Okaze Class.
Sato, already in service, was the only ship of her class to survive the axe, and served a long, uneventful second-line career until her first refit during the 30's...


Ships in class: (laid down-launched-commissioned - fate)

Sato 1920-1922-1922 - ?
Destroyer 24 1921-/-/ - Canceled and scrapped 1922
Destroyer 25 1921-/-/ - Canceled and scrapped 1922
Destroyer 26 1921-/-/ - Canceled and scrapped 1922
Destroyer 27 1921-/-/ - Canceled and scrapped 1922
Destroyers 28 through 48 /-/-/ - Canceled and reordered as Shion and Okaze Class units in 1922

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-Koko Kyouwakoku (Republic of Koko)
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-Koko - Civil Aviation


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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 13th, 2015, 9:33 pm
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Very nice work!

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Hood
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 14th, 2015, 7:35 am
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Very nice additions.

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 14th, 2015, 7:08 pm
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Some brief history up to 1921:


see: http://www.shipbucket.com/forums/viewto ... 10#p157777


more to come...

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-Koko Kaiun Yuso Kaisha - KoKaYu Line (Koko AU spinoff)
-Koko - Civil Aviation


Last edited by BB1987 on June 13th, 2016, 6:46 pm, edited 1 time in total.

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 15th, 2015, 9:56 am
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Very interesting!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 15th, 2015, 12:20 pm
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Yakogoro Class Light Cruiser (part 1, 1923-1930):

As the Naval construction plans went on in the late 1910s Koko no Kaigun started to plan building a new class of Cruisers to supplement the -at the time still under construction- Kashino class. Convenience and pratical reasons led to the obvious choice of basing the cruisers on the same 5.500-ton hulls of the japanese Kuma class units. During a joint designing work between KnK and the IJN, some modifications over the preceding class were considered: removing the armored conning tower and adding an enclosed hangar to the bridge structure in anticipation of seaplane handling and adding a take-off platform i front of it, switching from 533 to 610mm torpedoes was also envisioned. The resulting joint-design finally evolved to what became known as the Nagara class in Japan and the Yakogoro class in Koko.
Five units were ultimately ordered, three at Kousaten Navy yard and two at Toumachi Naval Arsenal. The ships were 162m long, 14,2m abeam and had a draft of 4,8. Displacing 5.535 tons at standar load (the Japanese Nagaras ended up dislacing 5.570T). Ten oil-firing and two mixed oil/coal boilers powered four turbines to 90.000shp, propelling the ships up to 36knots. Endurance was 6.000 nautical miles at 14 knots. The armament was the same as the Kumas and Nagaras, with 7 140mm/50 Type 3 guns in single shielded positions, AA armament was composed by two 76mm guns and single 6.5mm machine guns in removable positions. four twin sets for 610mm torpedoes were fitted, two on each sides, forward and aft of the funnels.
Yakogoro, the first ship of the class, was laid down at Kousaten in 1920. Houraisan and Suzuka followed at Toumachi in 1921, then Otonase at Kousaten later the same year. Finally, Minase was laid down at Kousaten in March 1922, a month after Yakogoro's launch. All five units were stil under construction when the Washington Naval treaty was signed, but works were not affected: Yakogoro was commissioned in early 1923. The ship immediately recieved a Yokosuka Ro-Go Ko-Gata floatplane, becoming the first Koko no Kaigun ship to operate a shipboard plane. Although the Ro-Go Ko-Gata was initially and extensively used to train ship -and air- crews in seaplane handling operations.
[ img ]
Construction of the other four ships slowed down as there was no immediate need to rush them in service -Destroyer production had been revised and fewer units would have been built and at later dates- but no unit was ever even remotely in danger of beign canceled. Instead, Koko no Kaigun took the advantage given by the extended building time to retrofit a clipper bow on all the remaining ships, with the intent of improving handling in rough seas. Houraisan, the second ship of the class, was commissioned in January 1925, soon followed by Suzuka and Otonase. All three recieved a Yokosuka Ro-Go Ko-Gata floatplane like Yakogoro, although just Houraisan operated it for more than a few months.
[ img ]
The last unit, Minase, was commissioned in December 1925 and sported some more pecultiar features if compared to her earlier sisters. As it was planned to equip her with a Yokosuka E1Y instead of a Ro-Go Ko-Gata, the taking-off platform was lenghtened by shifting the hangar backwards into the bridge structure, a thing that in turn forced the wireless room to be moved into an extra deckhouse built within the tripod mast. Two extra lookout platforms were added and two 60cm signaling searchlights carried.
[ img ]
All five initially made up two surface Sentai units, in the late 20's Yakogoro briefly operated as a Sensui Sentai Flagship for Submarines Ki-1 and Ki-2, other units became Suirai Sentai Flagships when new Destroyers finally entered service.


Ships in class: (laid down-launched-commissioned - fate)

Yakogoro 1920-1922-1923 - ?
Houraisan 1921-1924-1925 - ?
Suzuka 1921-1924-1925 - ?
Otonase 1921-1924-1925 - ?
Minase 1922-1924-1925 - ?

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My Worklist
Sources and documentations are the most welcome.

-Koko Kyouwakoku (Republic of Koko)
-Koko Kaiun Yuso Kaisha - KoKaYu Line (Koko AU spinoff)
-Koko - Civil Aviation


Last edited by BB1987 on June 13th, 2016, 6:46 pm, edited 1 time in total.

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Blackbuck
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: April 15th, 2015, 12:25 pm
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There's just something about those older Japanese cruisers that makes them look more elegant than other vessels.

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