NAVYPEDIA

Photo

Natsushio 1973

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
なつしお [Natsushio]	SS523		Shin Mitsubishi Jyuko, Kobe	5.12.1961	18.9.1962	29.6.1963	discarded 3.1978
ふゆしお [Fuyushio]	SS524		Kawasaki Jyuko, Kobe	6.12.1961	4.12.1962	17.9.1963	discarded 6.1980

Technical data

Displacement standard, t
Displacement normal, t	690 / 850
Length, m	61.0
Breadth, m	6.50
Draught, m	4.10 max
No of shafts	2
Machinery	2 Kobe Mitsubishi / Sulzer 6LDA25B diesel-generators, 2 Mitsubishi Electric electric motors
Power, h. p.	1350 / 1700
Max speed, kts	12 / 15
Fuel, t	diesel oil
Endurance, nm(kts)	4000(10) /
Armament	3 - 533 TT (bow, 9)
Electronic equipment	ZPS-2 radar, JQS-3, JQO-3, JQO-4 sonars, ZLR-1 ECM suite
Complement	43
Diving depth operational, m	150

Standard scale images

Graphics

Project history

Constructed under the 1961 programme, these boats were small and limited in capability. They were air-conditioned and had good habitability and a large safety factor. They were modelled after the US Barracuda and were somewhat shorter and thicker than Oyashio. In order to reduce hull resistance, an effort was made to produce a perfect a perfect double hull, external framing was used in order to improve internal space. Attention was paid to improving underwater manoeuvrability, and a 'jostick' was installed for steering. The class used a water pressure system for launching torpedoes, thus eliminating the emission of air bubbles. The main storage batteries were water-cooled.

Modernizations

None.

Naval service

No significant events.