Yusokan 1 Class Landing Ship:
As an insular country Koko pretty much needed ships to transport troops for every possible military operation, something that the military leaders realized quite soon. Under the Second Rearmament Bill of 1936 a class of eight landing ships was included in the building program. The ships were 60,6m long, had a beam of 9,4 and a draft of 4,3m (2,5m at the bow) for a displacement of 700T. Diesel engines, driving a single shaft, pushed them to a 14,3knots top speed. Endurance was around 3.000nautical miles at top speed. Armament was made up by a single 76mm gun, two single 25mm machine guns and a 150mm mortar. With a crew of 40, they were capable of carrying 170 troops and five tanks.
The first ship, Yusokan No.1 (often shortened as Y-No.1), was laid down in late 1936 and commissioned in 1938. When the war broke up in europe, the order was increased from eight to twelve ships and production was sped up after 1941. Four units were in service at the start of the pacific war, all taking part in the Aleutian invasion. Three more joined in 1942, another four in 1943 and the last one in early 1944. All were eventually sent south to support operations in the Solomon islands, not before being all painted in olive-green scheme. During the course of the year some also recieved Type13 Air-search radars.
Yusokans No.3, 4 and 5 were all sunk by air attack during the attirton battles between Kokoan/Japanese forces and US/Recerchean ones in the Solomons. Yusokan No.1 and No.2 were sunk during the Truk raid in February 1945. The seven remaining units Returned to Koko, where they recieved improved R2Fa air radars of Thiarian design and a revised camouflage with brouwn splotches other than the olive-green tone. The anti-air armament was also increased to twelve 25mm machine guns in single mounts.
Thus refitted the ships were employed in the Aleutian theatre. No.6, 7 and No.11 were sunk in early 1946 during US bombardments on the harbor of Mizushimo. After the end of the war, the four surviving units were eventually decommissioned and scrapped between late 1946 and mid 1947.
Ships in class: (laid down-launched-commissioned - fate)
Yusokan No.1 1936-1937-1938 - sunk 1945
Yusokan No.2 1937-1938-1939 - sunk 1945
Yusokan No.3 1938-1939-1940 - sunk 1944
Yusokan No.4 1939-1940-1941 - sunk 1944
Yusokan No.5 1940-1941-1942 - sunk 1944
Yusokan No.6 1941-1942-1942 - sunk 1946
Yusokan No.7 1941-1942-1942 - sunk 1946
Yusokan No.8 1942-1943-1943 - Decommissioned 1946
Yusokan No.9 1942-1943-1943 - Decommissioned 1946
Yusokan No.10 1942-1943-1943 - Decommissioned 1946
Yusokan No.11 1942-1943-1943 - sunk 1946
Yusokan No.12 1943-1943-1944 - Decommissioned 1947