Kozakura-class traffic boat

The Kozakura-class traffic boat (小櫻型交通艇,, Kozakura-gata kōtsūtei) was a class of motor gunboat of the Imperial Japanese Navy, serving from the 1930s to World War II. The IJN official designation was 30-ton traffic boat (三拾瓲交通艇,, 30-ton kōtsūtei).^[5]

IJN Kozakura in 1935
Class overview
Name	30-ton traffic boat
Builders	Harima Zōsen Corporation, Harbin shipyard
Operators	Imperial Japanese Navy Manchukuo Imperial Navy
Built	1935
In commission	1935–1939 (Japan) 1939–1945 (Manchukuo)
Planned	2
Completed	2
Retired	2 (?)
General characteristics
Type	Traffic boat (Motor gunboat)
Displacement	30 long tons (30 t) [1][2]
Length	25.00 m (82 ft 0 in) overall [1][2]
Beam	3.65 m (12 ft 0 in) [1][2]
Height	1.60 m (5 ft 3 in)
Draft	0.60 m (2 ft 0 in) [1]
Propulsion	[1][2] 2 × Ikegai diesels, 2 shafts, 120 bhp
Speed	13.2 knots (15.2 mph; 24.4 km/h) [1][2]
Armament	[3][4] 3 × Type 92 7.7 mm machine guns 1 × minesweeping gear

Background

In 1934, Manchukuo ordered four gunboats from Japan. The IJN established Extraordinary Navy Defense Corps (臨時海軍防備隊, Rinji Kaigun Bōbitai) to educate them^[6] and built two 30-ton motor gunboat Kozakura and Hakubai. In 1939, Kozakura and Hakubai which finished a duties and transferred to Manchukuo Imperial Navy, and the IJN withdrew from Manchukuo.

Ships in class

Ship[7]	Laid down[1]	Launched[1]	Completed[1][2]	Fate
Kozakura (小櫻)	30 April 1935	25 July 1935	25 August 1935	Harima's yard number # 217. Transferred to Manchukuo and renamed Hai Tien (海天) on 25 February 1939; survived war; whereabouts after that has been unknown.[2]
Hakubai (白梅)	30 April 1935	25 July 1935	25 August 1935	Harima's yard number # 218. Transferred to Manchukuo and renamed Hai Yang (海陽) on 25 February 1939; out of service in wartime.[2]