History
Imperial Japanese Navy
Name	Cha-228
Builder	Hayashi Kane Heavy Industries, Shimonoseki
Laid down	11 April 1944
Launched	1944
Completed	21 September 1944
Commissioned	21 September 1944
Stricken	30 April 1945
Homeport	Takao
Fate	Sunk in typhoon, 18 September 1945
General characteristics
Class and type	No.1-class Submarine chaser
Displacement	130 long tons (132 t) standard[1]
Length	29.20 m (95 ft 10 in) overall
Beam	5.65 m (18 ft 6 in)
Draught	1.97 m (6 ft 6 in)
Propulsion	1 × intermediate diesel shingle shaft, 400 bhp
Speed	11.0 knots (12.7 mph; 20.4 km/h)
Range	1,000 nmi (1,900 km) at 10.0 kn (11.5 mph; 18.5 km/h)
Complement	32
Armament	1 × 7.7 mm machine gun 22 × depth charges 1 × dunking hydrophone 1 × simple sonar From mid 1943, the 7.7 mm machine gun was replaced with a 13.2mm machine gun

Cha-228 or No. 228 (Japanese: 第二百二十八號驅潜特務艇) was a No.1-class auxiliary submarine chaser of the Imperial Japanese Navy that served during World War II.

She was laid down on 11 April 1944 as ship number 2078 at the Shimonoseki shipyard of Hayashi Kane Heavy Industries (林兼重工業株式會社 - now known as Hayashi Kanesen Co., Ltd jp:林兼造船).^[1][2] She was completed and commissioned on 21 September 1944 and assigned to the Mako Guard District operating out of Takao.^[2] She conducted patrol, escort, and minesweeping duties between Kagoshima, Chiringashima, Koniya (jp:古仁屋), and Keelung.^[2]

On 28 October 1944, she served as an escort of convoy KATA-916 along with a Type D escort ship (CD-30), a Chidori-class torpedo boat (Manazuru), a No.28-class submarine chaser (CH-49), a W-13-class minesweeper (W-15), 3 auxiliary minesweepers (Himeshima Maru, Shonan Maru No. 16, Toshi Maru No. 7), 3 auxiliary subchasers (Showa Maru, Cha-216, Cha-235), 3 auxiliaries (Kiyo Maru, Kochi Maru, Aikawa Maru), and an auxiliary netlayer (Kiri Maru No. 1 Go) for 13 transport/cargo ships (Tensho Maru, Amakusa Maru, Shinton Maru, Sanka Maru, Sanjin Maru, Hayama Maru, Torai Maru, Taikyu Maru, Sakishima Maru, Bansei Maru, Choki Maru, Kishin Maru, Kankyo Maru).^[3] The convoy moved cautiously from island to island departing from Naha then the Kerama Islands then Miyako-jima and then Iromote-Jima, Yaeyama Islands before finally arriving at Keelung on 1 November 1945.^[3] On 5 January 1945, she left Keelung escorting convoy Kita-9 consisting of 6 transports (Kankyo Maru, Torai Maru, Taiken Maru, Kishen Maru, Yaei Maru No. 10, Banshu Maru No. 31) along with 2 auxiliary netlayers (Choki Maru, Kiri Maru No. 1 Go), and 5 auxiliary subchasers (Showa Maru, Cha-216, Kochi Maru, Kyo Maru, Ayugawa Maru) headed to Kaohsiung.^[3][2] On 6 November 1944, the convoy arrived at Kaohsiung.^[3]

On 15 March 1945, she was assigned to the 2nd China Expeditionary Fleet.^[2] She survived the war.^[2] On 18 September 1945, she flooded and sank after being caught in a typhoon northeast of Sasebo.^[2]