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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 15th, 2015, 8:20 pm
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Another a repost of the original part one with an extra drawing to cover the 1930-1940 timeframe


Okaze Class Destroyer (Part 1, 1923-1940):

To supplement the 15 smaller Shion class Destroyers the naval staff reordered the last 6 ships of the canceled Sato class to a larger design: the Okaze Class. As for the Shions, in order to have the new units in service as soon as possible Okaze and her sisters were just slightly modified Kamikaze class Destroyers. Modifications included the addition of walkways that linked the bridge with the middle gun and searchlight platform, and a slighly different and better enclosed bridge structure. Armament consisted of four Type3 120mm/45 guns in single mounts, six 533mm torpedo tubes in three sets of double launchers and two 7.7mm machine guns. The ships were equipped to carry up to 20 mines if needed. Four Kampon boilers powered two-shaft geared turbines at 38,500 shp, giving the ships a top speed of 37knots and an endurance of 3.600 natical miles at 14 knots.
The lead ship, Okaze, was laid down in august 1922 and commissioned by fall 1923. Her perfomance was considered so satisfactory that another twelve units were immediately ordered, bringing the class to 18 ships. At the cost of 47 more tons in displacement when compared tot he Sato class (and 73 to the Kuchikukan 14 units), the Ozake sported the same armament but enyoyed 1,5 times more range and a nearly 3-knots higher top speed, all in a shorter and sturdier hull, more suited to blue water operations.
All ships were built between 1922 and 1929: 7 At Kumoi Arsenal, 4 at Toumachi Naval Arsenal, 3 at Kousaten Navy Yard, 2 at Hoshiguma Navy Yard and one at Yamatogawa Shipyards. Finally, one last unit, Mima, was ordered abroad in Japan as all available shipyards were full with construction. Mima was laid down at Yokosuka in september 1923, but was destroyed during the Grat Kanto Earthquake and had to be laid down again, she was ultimately commissioned in 1926.
[ img ]
Six units, Meira, Kana, Rikako, Chiyuri, Yumemi and Kurumi, recieved the newer 120mm/45 Type10 guns, which, having a maximum elevation of 70° effectively served as bot surface and AA guns. Also, they sported depth charges instead of the mine-laying gear of the earlier sisters.
[ img ]
Ruukoto, the las unit to be commissioned, in 1929, recieved some more modifications, beign given a larger bridge and an expanded searchlight/rangefinder platform. RDF equipment was added at midship and the bridge rangefinder replaced with a newer model.
[ img ]
The ships formed 5 Kuchikutai units (three 4-unit and two 3-unit) up to the mid 30's. Then, starting in 1936, they entered the yards for their pre-war refit: All had a late-model RDF equipment fitted, the bridge wings enclosed and two single 25mm machine guns fitted. Both funnels were increased in height to improve smoke-clearing issues. The depth charge complement was also notably increased and an hydrophone installed.
[ img ]
Despite beign of the same age of the Shion class, the Okaze were still considered capable enough to be rated as first-rate ships. Forming Suirai Sentais 5,6,7 and 9 led by Light Cruisers Asakura, Okazaki, Kompaku and Otonase, their role in an eventual war according to Koko no Kaigun strategy was to operate as anti-submarine units close to home waters or in support of larger naval operations.


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

okaze 1922-1923-1923 - ?
tsumujikaze 1922-1923-1923 - ?
norio 1923-1924-1924 - ?
sachio 1923-1924 1925 - ?
kawatake 1923-1924-1924 - ?
yoshizake 1923-1924-1925 - ?
mima 1923-1926-1926 - ?
kikuri 1923-1924-1925 - ?
konngara 1924-1925-1926 - ?
genjii 1924-1925-1926 - ?
rika 1924-1925-1926 - ?
meira 1925-1926-1927 - ?
kana 1925-1926-1927 - ?
rikako 1925-1927-1927 - ?
chiyuri 1925-1927-1927 - ?
yumemi 1926-1927-1928 - ?
ruukoto 1926-1928-1929 - ?
kurumi 1926-1927-1928 - ?

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WWII44
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 16th, 2015, 11:56 am
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out of curiosity does your country have carriers?


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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 16th, 2015, 12:06 pm
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WWII44 wrote:
out of curiosity does your country have carriers?
Not until 1939. By December 1941, there will be 2 CVL and 1 CV in service, with more building.

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 16th, 2015, 2:15 pm
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Awesome!

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 16th, 2015, 6:44 pm
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Link to part 1

Yakogoro Class Light Cruiser (part 2, 1930-1940):

Under the 1st rearmament bill approved by Morimoto's government in late December 1933, a refit for the five Yakogoro-class cruisers was funded. All ships entered the yards between 1934 and 1935, with the lead ship, Yakogoro, reworked in a little more than six months.
Main modifications involved the replacement of the pole mainmast with a tripod, which was almost 4 meters shorter. The new tripod mainmast housed two platforms for a lookout post and a 90cm searchlight, a boom was also added for aircraft-handling purposes. Aviaton facilities were removed from the bridge structure and moved amidship, with a Kure Type-2 catapult fitted above n°5 and N°6 gun mounts. A single Yokosuka E4N reconnaissance floatplane was carried. Forward, the former hangar space in the bridge were reconverted into flag-space, effectively improving the capability of the vessels to operate as either Sensui sentai or Suirai Sentai flagships. The now useless flying off platform was removed and replaced with an anti-air platform housing a quadruple 13mm machine gun mount. The 76mm guns at midships were also replaced by two more 13mm machine-gun mounts, this time twin ones. A radio room was added on the superstructure third level, inside the forward tripod mast legs, two enclosed lookout stations were also added. The main bridge was completely enclosed, beign given full windows and a solid roof. A 4,5m rangefinder was added above the enclosed bridge and the spotting tops were vastly enlarged, with the addition of an extra level and the fitting of a lookout post. Finally, the main deck surface area was expanded, with overhangs extending on both the port and starboard side well aft of the mainmast.
[ img ]
Houraisan was recommissioned by the end of 1934. Her modifications slightly differed from those of Yakogoro as she recieved a newer RDF gear and a 3,5m rangefinder on top of the bridge instead of a 4,5m one. Her birdge structure was also slighlty larger, owing mor space for flag duties.
[ img ]
Suzuka also slighlty differed from her sisters after the refit, as she only had her portside deck extension done. also, she sported two 90cm searhlights on the mainmast platfrom instead of one. Her bridge structure featured a two-deck deckhouse for the radio-room, the enclosed lookout platform was placed more forward as the sponson housing the 60cm signalling searchlight was not removed. Finally, the bridge roof was shorter and the spotting top central platform slightly smaller.
[ img ]
By 1936, under the second reamament bill, a second refit for the Yakogoro class was approved. As initially concieved it called for a radical modification of the fire-control and torpedo equipment. Yet, soon focus and budget shifted to the Battleship and Carrier program, so that only Otonase and Minase entered the yards in 1937. Even so, just Otonase eventually underwent the planned refit.
The radio room was moved down a deck, two 1,5m navigation rangefinders fitted on both sides of the bridge. The lower lookout post were opened, with a 6m rangefinder replacing the earlier ,45m one aabove the bridge. The forward searchlight platforms wereexpanded, with two 100cm units replacing the older 90cm ones. The two upper levels of the spotting top were removed, the lower one was expanded and fitted with a torpedo director and a dedicated main-gun director. The overall heigt of the mast was also substantially reduced. The mainmast had it's lookout platform removed and the 90cm searchlight replaced with a 110cm one. The pole derrick for aircraf-handling was replaced with a built-up one. A Kawanishi E7K replaced the Nakajima E4N, the RDF was replaced and two twin 25mm machine guns replaced the 13mm mounts at midship. At first it was planned to have the four twin 610mm torpedo tubes beign replaced by two quadruple launchers, but a shortage in manifactured torpedo tubes, prevented this to be implemented. Thus fitted, Otonase rejoined the fleet in 1938.
[ img ]
Delays ultimatedly prevented Minase to recieve the same modifications as Otonase, so that just a minor refit was done. The cruiser recieved the newer 110cm searchlight in place of the 90cm ones, the Kawanishi E7K and the twin 25mm machine guns. Other modifications included the fitting of a built-up derrick, the installations of a new 4,5m rangefinder unit and the shorteing of the foremast. Minase rejoined the fleet in 1939. The other thrre cruisers recieved minor improvements, like the upgrade of the anti-aircraft suite.
[ img ]
Eventually, all cruisers underwent a mor comprehensive refit during 1940-1941, just in time for the start of the war....

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emperor_andreas
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 16th, 2015, 6:46 pm
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Awesome work, my friend!

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eswube
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 17th, 2015, 6:41 pm
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Fantastic! :)

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BB1987
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 19th, 2015, 6:05 pm
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Link to part 1

Kumoi Class Light Cruiser (part 2, 1930-1940):

After tests of a spring catapult fitted on the forward flying off platform, done between 1929 and 1931, proved to be unsuccesful Kizu entered and left the yards repeatedly.
In 1931, she was briefly docked at Kumoi arsenal to disembarke the experimental spring-catapult, then returned to service. By mid 1932, she was recalled for modifications once again, this time at Toumachi naval Arsenal. During the works the flying off platform was removed and the hangar turned into flag space for the command crew. A Kure Type-2 catapult was fitted towards the stern, between gun mounts 6 and 7, the latter one was moved further astern to make space for the catapult turntable. Then the pole mainmast was removed and replaced with a tripod one, fitted with a derrick for aircraft-handling operations. A Nakajima E2N floatplane was retained as the spotter aicraft. With her modifications done, Kizu returned to service by early 1933.
Then in early 1934, under the first reamament plan approved by Morimoto's government, Kizu was docked once again, this time at Hoshiguma Navy Yard, for a major refit meant to improve her fire-control equipment. During the works the bridge was further extended aft, with new deckhouses housing the radio room added Lookout platforms were added adn the spotting top expanded, the 3,5m main rangefinder was replaced with a more advanced model. The main bridge was also enclosed, replacing the earlier canvas cover. the RDF equipment was upgraded and the two 76mm anti-air guns were landed, replaced by a quadruple and two twin 13mm machine guns. Finally, the main deck area was extended abaft the aircraft catapult. Such modified Kizu returned to service by the end of 1934.
[ img ]
Starting by mid-1934 Ayase, Kamu and Nayoro were also recalled for modernization, docking at Hoshiguma, Toumachi and Kousaten Yards respectively. As all three ships were supposed to join Kizu in Sentai-3 once recommissioned they were given roughly the same modifications of their already completed sister. Even so, they eventually differed. The three cruiser had their bridge structures and fire-control platofrms further enlarged and expanded, with a 4,5m rangefinder unit replacing the earlier 3,5m one. Given the increased topweight both the foremast and the forward funnel were cut down in height, giving the four stacks an uniform look. A Nakajima E4N was carried as the reconnassiance plane and the pole derrick was replaced by a built-up one, as to safely operate the heavier aicraft. Al ships were back in service by 1935.
[ img ]
Kumoi, the lead ship of the class, did not entered the yards until fall 1935. Because she was the only one of her class to operate as a Suirai Sentai flagship, and not as part of a surface Sentai, her modifications were deemed less extensive. Her bridge had less flag space and the fire-control-platform was not reworked as extensively, beign smaller like on Kizu. The lookout posts were also fitted differntly, and two 1,5m navigation rangefinders were installed on both sides of the bridge. Her searhlight platforms were expanded, with the four 90cm units that equipped the other sisters replaced by three 110cm ones. The foremat and funnel were shortened as well. Strangely, she did not recieved a built-up crane but was fitted with a simple pole, despite she was equipped with the far larger Kawanishi E7K seaplane. Kumoi was back in service by March 1936.
[ img ]
Strangely regarded more useful than the Yakogoros, despite the ships sported basically the same hull and the same main armament, and despite the much more advanced Kazami class was about to enter service, in 1938 the diet approved another large-scale refit for the cruisers, under the second rearmament bill that was approved two years earlier.
Kizu was once again the first ship to enter the yards, docked at Toumachi in 1938. during the works bridge space was further expanded and 1,5m navigation rangefinders fitted. The 3,5m main rangefinder was replaced by a new 6m unit, the onlder one beign moved at midship. The spotting top and fire-control paltforms were completely reworked, now housing torpedo directors, a dedicated greenhouse for fire-control and a type 94 main-gun director. All of this by further reducing topweight high the foremast. Searchlight platforms were reworked, and the former 90cm units were replaced by 110cm ones. A built-up derrick was fitted and an E7K seaplane embarked, the RDF replaced and the twin 13mm machine guns replaced by twin 25mm ones. Finally, foremast and first funnel were cut down in height. Kizu was recommissioned in 1939. Nayoro was refitted on the same lines during the year 1939.
[ img ]
A few weeks before Kizu returned to service, in late 1938, Ayase was docked at Toumachi to start an ever more comprehensive refit. She recieved four lookout stations, two 1,5m navigation rangefinders, larger binocular posts, expanded fire-control platforms and a heavily reworked and expanded bridge, also coupled with the largest flag space fitted on a Koko no kaigun light cruiser yet. Quadruple 13mm machine gun position ahead of the bridge recieved an enlarged and reworked platform, an auxiliary torpedo director was added between the funnels, the ventilation system above the engine room was reforked, with extra vents abaft the RDF room and the mainmast. The mainmast itself recieved two extra binocular paltforms. The main deck space was further expanded, completely covering the weather deck on both sides to the n°7 gun mount. Torpedo armament was also reworked, with the forward twin torpedo tubes were landed and their former position enclosed and turned into crew space. The aft torpedo mounts were removed and replaced by quadruple sets and equipped with 610mm Long Lance torpedoes. Finally, extra antenna works were added on the forecastle, and an Aichi E11A reconnaissance floatplane was carried, replacing the Nakajima E4N previously carried. Ayase was recommissioned in late 1940, Kamu looked identical once recommissioned a few months later.
[ img ]
By mid 1941 Kumoi, Nayoro and Kizu underwent further minor refits to be brought to Ayase standard.

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Biancini1995
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 19th, 2015, 6:23 pm
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Very Nice light cruisers BB1987,can't wait for more :D

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Blackbuck
Post subject: Re: Koko Kyouwakoku (Republic of Koko)Posted: August 19th, 2015, 9:01 pm
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These look magnificent, I really do love the early Japanese cruiser style.

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