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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 18th, 2015, 2:49 pm
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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 11:57 am
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Kumoi Class Light Cruiser (part 1, 1924-1930):

First class of cruisers to be laid down after the washington Naval Treaty, the Kumoi class was requested by the naval staff to fulfill surface and flagship duties for both Destroyers and Submarines. As for all the ships laid down for Koko no Kaigun during the early 20's the ships were based off finalized Japanese designs in order to speed up construction. Having previously jointly designed the Yakogoro/Nagara classes the new ships were nothing more than their direct evolution: The Sendai class already under construction in Japan. Differing from their relatives by having expanded RDF rooms at midship and full windows around the bridge, the five Kumoi class units were ordered by the Naval staff in late May 1922.
The ships were 162m long, 14,2m abeam and had a draft of 4,8. Displacing 5.195 tons at standar load. Twelve boilers powered four turbines to 90.000shp, propelling the ships up to 35,5knots. Endurance was 6.000 nautical miles at 14 knots. The armament was the same as all the other 5.500-ton cruisers, with 7 140mm/50 Type 3 guns in single shielded positions, argumented by two 76mm guns for AA duties. four twin sets for 610mm torpedoes were fitted, two on each side. Up to 56 naval mines could have been carrier if needed.
The lead ship, Kumoi, was laid down a Kousaten Navy Yard in late 1922, Ayase, Kamu and Kizu followed in 1923, the first at Kousaten, the other two at Hoshiguma. Nayoro, the last ship to be laid down, started construction at Toumachi Naval Arsenal in march 1924.
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Kumoi's construction went fast, as she was commissioned in late December 1924, even earlier than some of the preceding Yakogoro class units. Ayase and Nayoro followed during the second half of 1925, with Kamu joining in March 1926 and finally Kizu by fall of the same year. Despite beign given an hangar and a flying off platform below the bridge, none of the five sisters recieved a plane for years. The Kumoi class ships operated as surface Sentai units or Suirai Sentai Flagships as fleet necessities dictated. Nayoro became a Sensui Sentai Flagship in 1929 when the submarines of the Ki-3 class started to join the fleet.
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In 1929 Kizu recieved an experimental catapult on her flying off platform, and a Nakajima E2N was carried to test the new system. Like it happened on the IJN Cruiser Yura, which also sported a similar fit for experimental purpose, the system proved to be not succesful or satisfactory, so in 1931 the catapult was removed. An all-new aircraft handling system was thus fitted an all ships during their early 30's refits.
The Kumoi class was also the last class of light cruisers built by Koko no Kaigun for more than a decade. The Naval staff had started to focus on Heavy Cruisers, and the London Naval Treaty ratification in 1930 further delayed any follow-on class...


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

kumoi 1922-1924-1924 - ?
ayase 1923-1924-1925 - ?
kamu 1923-1924-1926 - ?
kizu 1923-1926-1926 - ?
nayoro 1924-1925-1925 - ?

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Krakatoa
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 12:43 pm
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The only question I would have concerns the torpedoes 8x61cm. The Type 93 did not enter service till 1933. Would the Japanese have shared one of their most secret weapons with Koko? Would the early classes of CL been fitted with 21" till/if the Type 93 became available.


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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 1:04 pm
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Krakatoa wrote:
The only question I would have concerns the torpedoes 8x61cm. The Type 93 did not enter service till 1933. Would the Japanese have shared one of their most secret weapons with Koko? Would the early classes of CL been fitted with 21" till/if the Type 93 became available.
Type8 No°1 and Type8 No°2, both conventional 610mm torpedoes differing just in warhead and range, were operational since 1920, when Koko is still under direct Japanese sovereignity. Even after the 1921 "indipendence" cooperation between KnK and IJN is high and there is a large technology sharing. More or less, at this point, and well through the 30's and even the early 40's Koko is well sided with Japan, with politicians beign more or less "let's act in a way that beneficts us but Japan also". Japanese control will be more direct after 1933 and the main reason for a table change during WWII will be IJA's misconducts heavily affecting Koko's too.
So in short I'd say that Japan will eventually share some aces with Koko, and that even without Type93 torpedoes I have some 24'inch fishes to field in their place.

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 2:48 pm
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Awesome work!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 4:27 pm
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F-9 Class Minelayer:

Because of their short operating range, Kuckikukan-10 class Destroyers were decommissioned between 1924 and 1927 as the more capable Okaze Class units were entering service. Still, their 33-knot top speed had not been overlooked by the Naval Staff, which after the quick and succesful conversion of the arlier Kuchikukan 1 class recognized the feasibility of converting them to other roles were they could have still exploited their high speed. Starting in 1924, as they were decommissioned, all ships sailed for Kumoi arsenal for conversion into Minelayers: All torpedo tubes and one of the five 76mm guns were removed, rails and new deckhouses added and all empited magazine spac turned into stowage for naval mines. Overall, the units so converted could have carried up to 120 warheads. Renamed Fusetsukan 9 through 12 and commissioned between 1925 and 1928, the four units replaced the four older Fusetsukan 1 and served in frontline duties until 1938, when they were placed in reserve and relegated to training duties.
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At the start of the Pacific War the entire class was recalled into active duty. Despite beign truly obsolete by that point all four had the 76mm guns removed and replaced by two twin 25mm machine guns, later augmented by two more single and a triple mount. By 1944 depth charge racks were also added in the vain attempt to counter US Sumbarine activity.
[ img ]
All four units were lost during the war: F-10 fell from submarine attack, the other three were lost because of air attacks.


Ships in class:

F-9 (ex DD-10) Converted 1924-1925 - Sunk 1944
F-10 (ex DD-11) Converted 1925-1926 - Sunk 1944
F-11 (ex DD-12) Converted 1927-1928 - Sunk 1945
F-12 (ex DD-13) Converted 1927-1928 - Sunk 1944

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 4:29 pm
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Very nice work!

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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 19th, 2015, 6:25 pm
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Great additions!

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ezgo394
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 20th, 2015, 12:08 am
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Yes, lots of great ships and history in this thread! Great work!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 20th, 2015, 2:58 pm
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Battlecruiser Amagi (part 1, 1920/26-1930):

Under the Hachi-Hachi Kantai plan, the IJN order a class Battlecruisers was approved in late 1917: Four ships were to be built, named Amagi, Akagi, Takao and Atago.
The ships had a planned standard displacement of 41,217t and 47,000t at a full load. The class design was 250m long at the waterline, and 251,8 m overall. The ships would have had a beam of 30,8m and a draft of 9,5 m. The design staff intended to use turbine engines driving four propeller shafts, which were to be powered by 19 Kampon water-tube boilers, eleven of which were oil-fired, while the other eight were to have mixed oil and coal for fuel. This system was designed to provide 131.200 shaft horsepower for a top speed of 30 knots. The planned fuel stores amounted to 3.900 tons of oil and 2.500 tons of coal, giving the ships a maximum range of 8.000 nautical miles at the planned cruising speed of 14 knots.
The ships were to be equipped with a main battery of ten 409mm/45 guns in five twin turrets arranged along the centerline: two superfiring turrets fore, and three in line aft of the superstructure. The guns fired at a rate of fire between 1,5 to 2,5 rounds per minute and had a maximum elevation of 30 degrees, allowing a range of over 32.810 yards (30 km). Each gun had 90 rounds and an approximate barrel life of 250–300 shots.
The secondary battery was to have consisted of sixteen 140mm/50 guns mounted in casemates along the center of the ship. The guns had a maximum elevation of 25 degrees, which enabled a maximum range of 19.140 yards (17,50 km). Four 120mm/45 anti-aircraft guns were to have been mounted amidships, along with eight 24 in (610 mm) above-water torpedo tubes.
It was planned that the Amagi class would be protected by a main belt 254 mm thick, sloped at 12 degrees, and a torpedo bulkhead 73 mm thick. The main battery barbettes were designed to have between 229 and 280mm of armor plating, with turret faces beign 305mm thick, and the conning tower would have had armor ranging in thickness from 76 mm to a maximum of 356 mm. Deck armor was to have been 98 mm thick.
Akagi was the first ship of the class to be laid down; construction began on 6 December 1920 at the naval yard in Kure. Amagi followed ten days later at the Yokosuka naval yard. The projected completion dates for the first pair of ships were December and November 1923, respectively. Atago was laid down in Kobe at the Kawasaki shipyard on 22 November 1921, and was projected to be finished in December 1924. Takao, the fourth and final ship of the class, was laid down at the Mitsubishi shipyard in Nagasaki on 19 December 1921, and was also projected to be completed in December 1924.

The Washington Naval Treaty, signed in February 1922, greatly reduced the tonnage allowed for capital ships in the signatory nations. The treaty also instituted a moratorium on new warship construction, but allowed both Japan and Koko to complete one warship over 35.000tons each that was currently under construction. Having no warships under construction to fullfill the allowances, Koko was ultimately allowed the transfer of one of the Capital ships under construction in Japan. With the IJN immediately choosing to complete Tosa as a battleship, Koko would have been granted one out of Kaga, Akagi or Amagi, as Takao and Atago were deemed not enough advanced to justify their completion..
Just days after the WNT ratification, a meeting between IJN and KnK Naval Staffs was called in Tokyo to dcide the fate of the three ships. As the IJN, unlike Koko no Kaigun, was also allowed to complete two capital ships under construction as Aircraft Carriers it was at least certain that all three would have been eventually built. At first members of the various Staffs were prone to complete Amagi and Akagi as carriers and to transfer Kaga to Koko no Kaigun upon completion, but the consideration of having the USN and the RN completing three and two 30+knot battlecruisers each ultimately led to the decision of granting Amagi to Koko. In August 1922 the deal was officially made, with construction on the Battlecruiser immediately restarted at Yokosuka.

Amagi was launched in November 1922 at the presence of high officials from the IJN and KnK, the ship then starting her fitting out proceedings, with delivery to Koko no Kaigun planned for the first half of 1924.
On Saturday, September 1, 1923 the Great Kantō earthquake struck Tokyo area, seriously damaging Yokosuka Naval Arsenal facilities too. One of the dock cranes toppled over crashing onto Amagi's quarterdeck, but apart this the ship did not suffered any direct damage from the earthquake. Still works on the battlecruiser were halted while earthquake damage to the Naval Arsenal was repaired. Works resumed sporadically in december 1923, but they did not proceeded at full pace until 1925.
Amagi was finally declared complete on January 1st, 1926, immediately setting out for her sea trails, reaching 30,14 knots during her third run off Tateyama. Amagi then steamed for Koko, reaching Toumachi Bay in early April, where she was officially commissioned as Koko no Kaigun's Flagship on April 14th, 1926.
[ img ]
Manned by 1.562 officers and men the huge Battlecruiser became the most desired sea post for all cadets, and the focus of most recruiting campaigns, quickly gaining a sort of iconic aura even in the eyes of the civilian population. At the time of her commissionming Amagi outclassed by far every other Koko no Kaigun warships in nearly every field: she was nearly twice as big as the Yagumo class Battleships and five knots faster with just a slighly shorter operating endurance, her main guns could threw more weight and over 5.000yards farther than the Yagumos could do. Comparision with the Goryo Class Battlecruisrs was even more amiss.
During the first years of her career Amagi had the strange distinction of forming her own single-ship Sentai, the gap in speed with the two Yagumos beign considered excessive by the Naval Staff to field all three units under the same battlegroup. Amagi was finally joined -and also replaced as a Flagship- by the Battleship Kii in 1930 and by Battleship Owari in 1933, before endering the yards for her main refit in 1935.


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

Amagi 1920-1922-1926 - ?

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