Cha-241 or No. 241 (Japanese: 第二百四十一號驅潜特務艇) was a No.1-class auxiliary submarine chaser of the Imperial Japanese Navy that served during World War II.
She was laid down on 1 April 1944 at the Yokosuka shipyard of Koyanagi Shipyard Co., Ltd. (株式會社小柳造船所) and launched on 19 September 1944. She was completed and commissioned on 22 October 1944; fitted with armaments at the Yokosuka Naval Arsenal; and assigned to the Kii Defense Force, Osaka Guard District under Ensign Koji Matsumoto. On 29 November 1944, Cha-241 joined the destroyers Hamakaze, Yukikaze, and Isokaze who were escorting the carrier Shinano en route from Yokosuka for Kure when the carrier was torpedoed and sunk by the US submarine Archerfish at [url=geohack.toolforge.org/geohack.php?pagename=Japanese_submarine_chaser_Cha-241_(1944)¶ms=33_07_N_137_04_E_]33°07′N 137°04′E[/url]. Cha-241 survived the war.

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 × 13.2mm machine gun[​2] 22 × depth charges 1 × dunking hydrophone 1 × simple sonar