The ''ST-class'' was a type of armored boat of the

Imperial Japanese Army The Imperial Japanese Army (IJA; , ''Dai-Nippon Teikoku Rikugun'', "Army of the Greater Japanese Empire") was the principal ground force of the Empire of Japan from 1871 to 1945. It played a central role in Japan’s rapid modernization during th ...

that saw service during

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

. She was developed in 1940 (Showa 15) mainly for riverine patrol in China, a role that was previously served by the Soukoutei-class armored boat. The prototype was 11 meters long with a beam of 2.00 meters and a draught of 1.10 meters. Her speed was 9.65 knots. All ships were built at the

Yokohama is the List of cities in Japan, second-largest city in Japan by population as well as by area, and the country's most populous Municipalities of Japan, municipality. It is the capital and most populous city in Kanagawa Prefecture, with a popu ...

shipyard of

Mitsubishi Heavy Industries is a Japanese Multinational corporation, multinational engineering, electrical equipment and electronics corporation headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile division is the prede ...

She was armed with a 37 mm gun ( :jp:狙撃砲).

References

Ships of the Imperial Japanese Army Ships built by Mitsubishi Heavy Industries {{WWII-stub