Thailand could acquire Chinese CHD620 diesel engine for the Yuan class submarine.

According to information published by Bangkok Post on August 10, 2022, the Royal Thai Navy (RTN) could accept the Chinese-made CHD620 engine for the S26T Yuan-class submarine.
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Artist rendering of the future Yuan class submarine (Picture source: Sohu)

The Yuan class submarine is a class of diesel-electric submarine in China's People's Liberation Army Navy. It is China's first AIP-powered submarine and is presumed to be one of the quietest diesel-electric submarine classes in service.

The class inherits the tail design of Type 039 (Song class) with upper and lower rudders and stern planes with a single propeller shaft. A pair of fairwater dive planes are positioned on the sail.

The submarine is equipped with an indigenously developed machinery rafts (shock absorbers) system that helped to reduce the noise levels by over 35 dB. Additionally, the submarine is covered with rubber anti-sonar anechoic tiles to reduce the risk of acoustic detection.

The Yuan class has six 533 mm (21 in) torpedo tubes. These can be used to launch indigenous torpedoes such as Yu-6 as well as Russian-made torpedoes. It is speculated that it will be equipped with the supersonic YJ-18.

The class of submarines is also believed to be capable of launching YJ-8X (C-80X) series anti-ship missiles. The missile uses inertial + terminal active radar guidance. It carries a 165 kg (364 lb) time-delayed semi-armor-piercing high-explosive warhead, with a maximum range of 80–120 km (50–75 mi) and speed of Mach 0.9.