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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 25th, 2015, 1:25 pm
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Great work!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 27th, 2015, 9:16 pm
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Saimei Class Heavy Cruiser (Part 1, 1928-1940):

By 1924 Light Cruiser production for Koko no Kaigun was in full swing, with no less than sixteen units already in service or under construction. As the Naval Staff considered such number to be largely adequate (The IJN had the same number of modern units ins ervice or under construction too) building priorities switched towards larger Heavy Cruisers. As it was common and accustomed practice KnK looked at IJN designs for simplicty and commonality, ultimately focusing on the Aoba and Myoko classes.
The smaller Aoba design was chosen, but with many features from the Myokos incorporated into the design. Armor was increased in thickness from 75mm to 100mm, with 75mm extensions that connected to the main gun barbettes with diagonal, internal, bulkheads. Barbettes themselves were 75mm, deck 35mm and turret armor was 25mm thick. The hull was modified accordigly to support the extra weight of the armor, with a beam of 16,4 meters, draft was 5,71m. The charachteristic ondulating line of the hull was simplified towards the stern, and the curvature of the bow was modified into a more pronunced stem to reduce sprays over the foredecks, increasing the overall lenght of the ships to 185,7m, roughly 0,6m more than a standard Aoba class. Twelve all-oil-firing boilers were also installed generating 114.000shp and powering four sets of geared turbines driving as many propellers for an expected top speed of 35 knots. Endurance was planned at 6.000 nautical miles at 14 knots. Armament was the same as the Aoba class, with six 200mm/50 guns in three twin turrets, four 120mm/45 single anti-aircraft guns and two 7.7mm machine guns, just the main gun turrets were of a modified design, more similar to those fitted on the Moyko class.
Approved in 1925 as class of two, the first ship was laid down at Toumachi Naval Arsenal in 1926, launched in late 1927 and finally commissioned in spring 1928. The cruiser, named Saimei, meet all her expected requirements, reaching 35knots with ease during her trial runs in Toumachi bay. Externally, the ship was quite similar to the Aoba class from which she had derived, hull lines differed slighlty from that of her half-siblings, and superstructure and bridge platforms were also arranged disfferently, with larger bridge greenhouses, larger spotting platforms and 1,5m rangefinders fitted on both sides of the fire-control tower. hangar for the spotting floatplane also lached the sloping roof in it's forward part. during the same years she was commissioned, Saimei became the first ship in Koko no Kaigun to be fitted with an aircraft catapult, much like Kinugasa did for the IJN. Nominally claimed to be a 7.100T unit like the Aoba or the furutaka class, Saimei truly displaced some 8.295T instead. Between 1928 and 1931, she formed Sentai 3 with the light cruiser Yakogoro while her sister was beign built.
[ img ]
The second unit of the class, Nanto, was laid down in early 1928 at Toumachi naval Arsenal, a few months her sister had been launched. Construction went on untill the hull cleared the slipways by mid 1930. As the London Naval Treaty intervened, precluding Koko no Kaigun building plan for cruisers to proceed as planned, the Naval Staff decided to delay Nanto's completion in order to fit more advanced equipment on her. The main gun turrets were switched with the newer Model-E 203mm/50 that equipped the japanese Takao class (the discarded turrets were reused for coastal-defence purposes), the 120mm guns recieved shields and two 40mm machien guns replaced the 7.7mm ones. A more powerful Type2 catapult was fitted instead of the Type1 of Saimei. The more striking differencies ere in the bridge structure though: a more advanced fire-control equipped was fitted, with the entire bridge beign relocated one deck higher, the RDF eqipment was moved to the former bridge area, with two enclosed lookout posts were fitted on each side. The 1,5m navigationr angefinders were also relocated, and were of a newer model. Such fitted Nanto was commissioned in December 1931, joining her sister's Sentai.
[ img ]
After six years of service as the sole Heavy Cruisers of KnK both sisters entered the yards for their main reconstructions, emerging as two deeply changed units that looked more alike to each other than they were before. New fire control equipment was fitted, with a main director set with a 6,5m rangefinder mounted atop the main superstructure and a single backup director between the funnels and the mainmast. Another set with a director and a 4,5m rangefinder was fitted on each side of the birdge structure to control anti-aircraft guns. the 7.7mm machine guns from Saimei and the 40mm ones from Nanto wrere landed, replaced by four twin 25mm machine guns at midship and a quadruple 13mm one above the RDF room, maghine gun directors were fitted abreast the after funnel. The searchlight platforms rearranged and relocated, with the searchlights themselves (originally five, split between three 110cm and two 90cm ones) replaced by three moder 110cm "shiki" ones. The aft sperstrcture was completely reworked, with the aircraft hangar replaced by an open platform housing two Nakajima E8N. The former hangar space was converted into a torpedo deck, housing two rotating quadruple sets for the 610mm Long Lance torpedoes, both augmented by two armored boxes containing as many reloads, the former twelve hull-mounted sets were removed, freeing much needed crew space. Saimei had her bridge relocated and enclosed one deck higher, Nanto, already featuring that particular arrangement, had hers just enlarged and upgraded. Saimei also had the 200mm/50 main gun barrels replaced with the newer 203mm/50 ones, her turrets were not replaced though, this created a small anomaly between the two sisters, with Nanto beign able to elevate her guns up to 70° (although only up to 55° was considered pratycal) and Saimei only up to 40°. The Naval Staff planned to rectify this problem by exploiting the already reopened production lines for heavy Cruisers by building some more extra turrets in order to replace Saimei older ones. All the modification eventually increased displacement of both ships, in order to avoid the draft from increasing too much and to improve stability, torpedo bulges were added, bringing the ships beam to 17,6m. The bulges improved torpedo defense and also expanded bunkerage, allowing the range to remain at 6.000nm. engines were refurbished but not increased in power, thus the top speed dipped slightly to 34,5knots. Post-refit standard displacement was 8.902T standard, with full load exceeding 10.000T.
[ img ]
Joined in the fleet by the newer Senjo class Heavy crusiers, soon followed by the Goryo class, the two Saimeis formed Sentai 4 up to the start of the Pacific War.


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

Saimei 1926-1927-1928 - ?
Nanto 1928-1930-1931 - ?

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 27th, 2015, 9:17 pm
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Very nice work!

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Hood
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 28th, 2015, 8:10 am
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These are excellent!

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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 29th, 2015, 5:36 pm
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Great work!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 31st, 2015, 4:54 pm
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Hakugei Class Submarine Tender (Part 1, 1928-1940):

In order to provide support to the large number of submarines that were planned to enter service by the late 20's, Koko no Kaigun immediately started the developement of a dedicate Submarine Tender. The closest example of such ship to be examined was the Japanese Jingei class that was about to enter service by mid 1923, yet those ships would have been unable to support the larger Kaidai-type submarines currently under developement by the IJN. Since Koko's Naval Staff had eventually planned to put in service larger, similar, units after all the smaller Ki-3 Class units had been completed it appeared obvious that the support ships had to be of a larger design.
By the time the first ship, to be named Hakugei, was laid down at Yamatogawa Shipyards in late 1923, the planned tender had grown by almost 50% if compared with the original specifications. Hakugei was launched in 1926 and commissioned by late 1928, just months before the first submarines of the Ki-3 class entered service. a second unit, Shiroiruka, started construction at Yamatogawa in 1926, just after Hakugei's launch.
The tenders were 193,7m long overall, had a beam of 18,2 and drafted 6,6m. displacement was 11.993tons at standard load, rising to 14.478 at full load. Mixed coal and oil-firing boilers powered two geared turbines with 20.348shp, driving two screws for a maximum speed of 21 knots. Endurance was 10.400 nautical miles at 14 knots. The hull was not armoured, but the ships were nevertheless armed with two twin 140mm/50 turrets fitted forward in a superfiring arrangement. Turrets beign the sole armoured parts of the ship, protected by 50mm steel plates on faces, 10mm on roofs and 30mm on hoists. Two 120mm/45 single anti-aircraft guns and two 7.7mm machine guns were also carried. The stern of the ship was dedicated to floatplane operations: a Type1 catapult was fitted on the quarterdeck, while an enclosed hangar in the after part of the superstructure housed two Nakajima E2N reconnaissance floatplanes.
Overall, the ships had a total bunkerage of 5.339tons of oil to replenish Submarines tanks, other than beign able to carry a full stock of 76 torpedoes and up to nine periscope sets.
[ img ]
Shiroiruka had been launched in 1929, and had started her fitting out when the London Naval Treaty was signed. The treaty heavily limited Koko no Kaigun allowed tonnage of Submarines, stalling the construction plan for years, effectively cutting the fleet to just 10 subs. The ship was thus givn a lower priority and was commissioned only in late 1932. She was given newer 40mm machine guns in place of the older 7.7mm ones, her bridge was fully enclosed and the aft catapult was modified into a Type2 in place of the Type1 fitted on Hakugei.
[ img ]
A third unit, Kokukujira, had been laid down at Yamatogawa after the launch of Shirouruka, but Treaty limiatons to the sumbarine fleet made her completion unnecessary. Since her hull was at a very early stage of construction further work were canceled in november 1930. Kokukujira was scrapped on the slipway and the materials intended for her construction were used for Shiroiruka fitting out or diverted to other ships under construction.
During the late 30's both ships recieved a twin 25mm machine gun above the hangar and had the 7,7 and 40mm machine guns replaced by two twin 13mm ones. Hakugei had her catapult reeplaced by a Type2 model and her bridge was enclosed. Both had the floatplane complement upgraded, with Kawanishi E7K replacing the old Nakajima E2N.
[ img ]
Hakugei operated as the flagship of the newly formed Sensui Sentai 2 in 1929, Shiroiruka replaced Nayoro in Sensui Sentai 1 once she was commissioned in 1932. Both ships mantained their roles for the rest of the decade.


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

hakugei 1923-1926-1928 - ?
shiroiruka 1926-1929-1932 - ?
kokukujira 1929-/-/ - Canceled and scrapped 1930

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Garlicdesign
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 31st, 2015, 5:17 pm
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Hello BB1987!

Really spectacular, I like very much!

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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 31st, 2015, 6:24 pm
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Great drawing (and a rare - on SB - a kind of vessel)!

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JSB
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 31st, 2015, 7:08 pm
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Very nice drawing,
but would it not make more sense to go with DP guns ? at least later the IJN 4.7'/120mm (or later 5'/127mm) maybe x6 (2x2+2x1) when will a tender get to fight on the surface, unless its designed to join in commanding the start of the decisive battle ? Then it really needs TTs ! (its carrying spares anyway ?)


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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: May 31st, 2015, 7:24 pm
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JSB wrote:
Very nice drawing,
but would it not make more sense to go with DP guns ? at least later the IJN 4.7'/120mm (or later 5'/127mm) maybe x6 (2x2+2x1) when will a tender get to fight on the surface, unless its designed to join in commanding the start of the decisive battle ? Then it really needs TTs ! (its carrying spares anyway ?)
No Japanese Submarine tenders ever carried torpedo launchers, all the torps they had in stock were for replenishing submarines. Later-built IJN Tenders (like Taigei and the Tsurugisaki class) had 127mm DP guns in place of the 140mm ones, but all three were later converted into light carriers. This bougth back to frontline service the two old Jingeis, which were armed with thr earlier, larger caliber, weapon. Still no one ever thought about replacing those guns, even during their wartime refits the Jingeis only got extra 25mm amchin guns and the 140mm guns stuck in place. The Hakugei is a design more akin to the Jingeis that the Taigei/Tsurigisaki so that's why I've chosen the 140mm guns (*), and since the IJN left the Jingeis with that main armament for their entire career I thought that KnK would have done the same.


(*) the basis on which I've crafted the two Hakugeis is that Jingei themselves were initially planned as 14.500T-full load units, then scaled back to 8.000/8.500T after the WNT cut the IJN naval construction program, negatin the need of ships that big.

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