The CH-13s were an improved design based on the CH-1 and CH-4 class designs. During the war, most of the 15 units of the class were rearmed with triple-mount 25-mm Type 96AA guns and were fitted with Type 22 radars and a radar detector.
|| 438-tons standard.|
||167.4' x 22' x 9'
||2 diesel engines, 2-shafts, 1,700 b.h.p, maximum speed 16 knots
||1 x 80-mm (3-inch)/40 cal HA gun, 2 x 13.2-mm mg, 1 x 25-mm Type 96 AA gun, 3 x Type 94 depth charge thrower, 2 depth charge rails, 36 depth charges, Type 93 hydrophones and Type 93 sonar.|