CH-4-class submarine chaser

	No.8 in 1938
Class overview
Name	No.4 class submarine chaser
Builders	Tsurumi Iron Works (3); Mitsubishi Heavy Industries (2); Ōsaka Iron Works, (2); Tama Shipyards, (2);
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)
Retired	2 (or 3)
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. Nine vessels were built between 1937 and 1939 under the Maru 3 Programme.

Class overview
No.8 in 1938
Name	No.4 class submarine chaser
Builders	Tsurumi Iron Works (3) Mitsubishi Heavy Industries (2) Ōsaka Iron Works, (2) Tama Shipyards, (2)
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)
Retired	2 (or 3)
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