Standard displacement below 1,000 tons and a top speed of 19.7 knots place the design within the small-escort treaty framework. Diesel engines provided propulsion. The gun armament included three 4.7-inch guns, while the light anti-aircraft fit could include 15 Type 96 25 mm guns alongside machine guns. Six depth-charge throwers, 60 depth charges and an anti-submarine mortar supplied the underwater armament described here. Endurance exceeded 5,200 nautical miles at 16 knots with 150 tons of fuel. These specifications support the classification as useful sloops or corvettes designed before modern wartime frigates and destroyer escorts entered service.
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Shimushu's treaty-sized escort specification
Shimushu's sub-1,000-ton design combines a speed below 20 knots with guns, depth charges and enough endurance for sustained escort work.