Hayashio-class submarine

JDS Hayashio

The Hayashio-class submarine was the successor to the , and the predecessor of the within the Japan Maritime Self-Defense Force. Ordered in 1959, the boats were small with limited capabilities but were successful. Constructed in Japan from 1960 to 1962, they remained in service until 1979 when they were decommissioned.

Design and description

The Hayashio class was based on the United States Navy Barracuda-class submarines. They were small with limited capability and were shorter and wider than the preceding Japanese .Template:Sfn The main mission of the class was for operations in coastal waters.Template:Sfn They were air conditioned and provided quality habitability for their crews and were considered a successful submarine design.Template:Sfn They measured long overall with a beam of Template:Cvt and a draft of Template:Cvt. They had a surfaced displacement of and submerged. Part of the design was to reduce hull resistance and to do this, external framing was used to improve internal space and create a better double hull. They had a crew of 43.Template:Sfn

The submarines were propelled by two propeller shafts powered by a diesel-electric system composed of two Sulzer-Mitsubishi diesel engines creating and two electric motors creating Template:Cvt.Template:Sfn The main storage batteries were water-cooled. This gave the vessels a maximum speed of surfaced and submerged.Template:SfnTemplate:Efn To improve underwater maneuverability, a joystick was installed instead of the traditional wheel at the helm position. The submarines mounted three torpedo tubes in the bow for torpedoes. The class used a water pressure system to launch torpedoes that eliminated the creation of water bubbles.Template:Sfn

Boats

Hayashio class construction dataTemplate:SfnTemplate:Sfn
Pennant no.	Name	Builder	Laid down	Launched	Commissioned	Fate
SS-521		Shin Mitusbishi, Kobe	6 June 1960	31 July 1961	30 June 1962	Decommissioned 25 July 1977
SS-522		Kawasaki, Kobe	7 June 1960	28 August 1961	17 August 1962	Decommissioned 23 March 1979

Construction and career

Both submarines were ordered in 1959 from Japanese shipyards. Both Hayashio and Wakashio entered service in 1962.Template:Sfn On 20 May 1970, Hayashio collided with a merchant vessel damaging the submarine's periscope. They were both stricken from the naval vessel register in 1979, with Wakashio on 23 July 1979.Template:Sfn