[1] For this reason, when the Ministry of Finance approved the allocation of defense contributions to ship construction costs when formulating the budget for 1954, the National Safety Agency's security forces had eight 300-ton and 60-ton class submarine chasers.

Of these, this model was said to be equipped with a high-speed, lightweight diesel main engine manufactured by Kawasaki Heavy Industries.

[6] The ship type has a flush deck similar to the CH-4 and No.13-classes, but in order to improve stability, seakeeping and habitability, a strong shear was provided to make the bow larger and toward the stern.

In addition, the bridge and deck chamber were separated in order to reduce the area on the wind pressure side as the center of gravity descended, and the bridge was moved as close to the center as possible to suppress acceleration due to longitudinal sway.

[6][3] Regarding armament, the US Navy generally follows the PC-461-class submarine chaser that was maintained during World War II, with a twin Mk.1 Bofors 40mm gun on the front deck and a hedgehog launcher just before the bridge structure behind it.

As part of the measures to lower the center of gravity, the tip of the depth charge drop rail was made embedded.