ST-class armored boat

The ST-class was a type of armored boat of the Imperial Japanese Army that saw service during World War II.^[2][1][3] She was developed in 1940 (Showa 15) mainly for riverine patrol in China,^[1] 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.^[1] All ships were built at the Yokohama shipyard of Mitsubishi Heavy Industries^[1] She was armed with a 37 mm gun (jp:狙撃砲).^[1]

Class overview
Name	ST-class armored boat
Builders	Mitsubishi Heavy Industries, Yokohama
Operators	Imperial Japanese Army
In service	1940–1945
General characteristics
Type	Armored boat
Length	11 m (36.09 ft) o/a[1]
Beam	2.0 m (6.56 ft)[1]
Draught	1.1 m (3.61 ft)[1]
Installed power	150 hp[1]
Propulsion	Diesel engine[1]
Speed	9.65 knots (17.9 km/h)[1]
Armament	1 x 37 mm tank gun[1]