No.4 class submarine chaser

No.8 in 1938
Class overview
Name:	No.4 class submarine chaser
Builders:	Mitsubishi Heavy Industries Ōsaka Iron Works Tama Shipyards Tsurumi Iron Works
Operators:	Imperial Japanese Navy Republic of China Navy
Preceded by:	No.3 class
Succeeded by:	No.13 class
Cost:	1,579,000 JPY
Built:	1937 – 1939
In commission:	1938 – 1960
Planned:	9
Completed:	9
Lost:	7 (or 6) [1]
Retired:	2 (or 3) [1]
General characteristics
Type:	Submarine chaser
Displacement:	291 long tons (296 t) standard 309 long tons (314 t) trial
Length:	56.2 m (184 ft 5 in) overall 55.5 m (182 ft 1 in) waterline
Beam:	5.6 m (18 ft 4 in)
Draught:	2.1 m (6 ft 11 in)
Propulsion:	2 × Kampon Mk.22 Model 6 diesels, 2 shafts, 2,600 bhp
Speed:	20.0 knots (23.0 mph; 37.0 km/h)
Range:	2,000 nmi (3,700 km) at 14 kn (16 mph; 26 km/h)
Complement:	59
Armament:	• 2 × 40 mm heavy machine guns • 36 × depth charges • 2 × Type 94 depth charge projectors • 1 × depth charge thrower • 1 × Type 93 active sonar • 1 × Type 93 hydrophone No.4, November 1944 • 2 × 40 mm heavy machine guns • 3 × Type 96 25 mm AA guns • 36 × depth charges • 2 × Type 94 depth charge projectors • 2 × depth charge throwers (estimate) • 1 × 13-Gō surface search radar • 1 × Type 3 active sonar • 1 × Type 93 hydrophone

The No.4 class submarine chaser (第四号型駆潜艇,, Dai 4 Gō-gata Kusentei^?) was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during and after World War II. 9 vessels were built in 1937-39 under the Maru 3 Programme.

Design

• Project number was K7. The No.4 class submarine chaser was reinforced model of the No.3 class. They lifted freeboard. Other general placement were same as No.3 class.
• Their design was elaborate, because the Navy Technical Department (Kampon) devoted itself to making them small. However, their designs were not able to accept the reinforcement of anti-aircraft guns and depth charges.

Ships in class

Ship #	Ship	Builder	Laid down	Launched	Completed	Fate
62	Car Nicobar on 11 April 1945.
63	Strait of Malacca on 4 March 1945.
64	Surabaya on 13 August 1945.
65	Royal Navy off Singapore on 11 July 1946. Decommissioned on 10 August 1946.
66	Buka Island on 6 November 1943.
67	Mindanao on 13 July 1944.[1] Decommissioned on 30 September 1945.
68	Angaur on 2 May 1944. Later scuttled.
69	Republic of China on 3 October 1947, and renamed Haida. Renamed Fuling (PC-107) in January 1951. Renamed Minjiang in 1954. Decommissioned ni 1960.
70	Palau on 30 March 1944. Later sank in shallow water.

Footnote

1. ^ ^{a b c} Another opinion: The No.12 was survived war at Palau.
2. ^ Submairne chaser No.7 (第7号駆潜艇, Dai 7 Gō Kusentei^?). The same shall apply hereinafter.

Bibliography

• Ships of the World special issue Vol.45, Escort Vessels of the Imperial Japanese Navy, "Kaijinsha". http://www.ships-net.co.jp/. , (Japan), February 1996
• The Maru Special, Japanese Naval Vessels No.49, Japanese submarine chasers and patrol boats, "Ushio Shobō". http://www.kojinsha.co.jp/.  (Japan), March 1981