The CH-1 class of two units were the first of the IJN's purpose-built submarine chasers completed. These were the smallest combatants in the fleet. The CH-1's suffered from a top-heavy design. After torpedo boat TOMOZURU capsized in a storm in 1934, the IJN took a number of similar vessels in hand, including the CH-1s, to add more ballast to improve their sea-worthiness. In 1944, both units of the class were rearmed with triple-mounted Type 96 25-mm AA guns.
A single unit of the CH-3 class was also built in 1936 with less topweight.
|Dimensions:||210' x 19.4' x 4.7'|
|Propulsion:||2 geared turbines, 2-shafts, 3,400 s.h.p, maximum speed 21 knots|
|Armament:||2 x 40 mm AA guns, 2-7.7-mm MGs, 36 depth charges.|