History
Empire of Japan
Name	CH-22
Builder	Mitsubishi Heavy Industries, Yokohama
Launched	29 May 1941
Completed	12 October 1941
Fate	Sunk, 19 February 1944
General characteristics
Class and type	No.13-class submarine chaser
Displacement	438 long tons (445 t) standard
Length	51 m (167 ft 4 in) o/a
Beam	6.7 m (22 ft 0 in)
Draught	2.75 m (9 ft 0 in)
Propulsion	2 × Kampon Mk.23A Model 8 diesels, 2 shafts, 1,700 bhp (1,268 kW)
Speed	16 knots (30 km/h; 18 mph)
Range	2,000 nmi (3,700 km) at 14 kn (26 km/h; 16 mph)
Complement	68
Sensors and processing systems	1 × Type 93 active sonar 1 × Type 93 hydrophone
Armament	1 × 76.2 mm (3 in) L/40 AA gun 2 × Type 93 13.2 mm (0.52 in) AA guns 36 × Type 95 depth charges 2 × Type 94 depth charge projectors 1 × depth charge thrower

The Japanese submarine chaser CH-22 was a No.13-class submarine chaser of the Imperial Japanese Navy during World War II. She was built by Mitsubishi Heavy Industries, Yokohama, launched on 29 May 1941 and completed on 12 October 1941. On 24 August 1942, she left Rabaul as part of Operation RE, for the landings at Milne Bay.

On 19 February 1944, while off Kavieng, New Ireland in Convoy O-902, she was attacked by United States Army Air Forces B-25's of the 500th and 501st Bombardment Squadrons, A-20's of the 3rd Bombardment Group and P-38's and was sunk at 03°04′S 150°42′E / 3.067°S 150.700°E / -3.067; 150.700.

• "Escort Vessels of the Imperial Japanese Navy special issue". Ships of the World (in Japanese). Vol. 45. Kaijinsha. February 1996.
• Model Art Extra No.340, Drawings of Imperial Japanese Naval Vessels Part-1 (in Japanese). Model Art Co. Ltd. October 1989.
• The Maru Special, Japanese Naval Vessels No.49, Japanese submarine chasers and patrol boats (in Japanese). Ushio Shobō. March 1981.

• "IJN Subchaser CH-22: Tabular Record of Movement". Combined Fleet.

v t e Shipwrecks and maritime incidents in February 1944
Shipwrecks	1 Feb: I-171, Ro-39, Umikaze 3 Feb: Monte Pascoal, Nichiai Maru 4 Feb: U-854, Vautour 6 Feb: U-177 8 Feb: Petrella, U-762, Lima Maru 9 Feb: U-238, U-734 10 Feb: El Grillo, Minekaze, U-545, U-666 11 Feb: Ro-110, U-283, U-424 12 Feb: I-27, Khedive Ismail, Oria 13 Feb: Henry, Irma, USS Macaw 14 Feb: U-738, UIT-23 15 Feb: I-43 16 Feb: Ro-40 17 Feb: Agano, Aikoku Maru, CH-24, Fumizuki, I-11, Katori, Maikaze, Naka, Tachikaze, Tonan Maru No. 3, W-26 18 Feb: Heian Maru, Oite, HMS Penelope, U-7, U-406 19 Feb: CH-22, U-264, U-386 20 Feb: Hydro, HMS Warwick 21 Feb: Kokai Maru 22 Feb: British Chivalry 24 Feb: U-257, U-761 25 Feb: HMS Inglefield, HMS Mahratta, Ryūsei Maru, Tango Maru, U-601 26 Feb: USS Ailanthus, U-91 27 Feb: USS Grayback, HMS Woodpecker 29 Feb: USS Trout Unknown date: Cymric, USS Thompson
Other incidents	15 Feb: Agano 16 Feb: LST-418 20 Feb: HMS Woodpecker 25 Feb: HMCS Columbia Unknown date: USS Onyx
1943 1944 1945 January 1944 March 1944