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YF-115

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Status: Operational 2016. Thrust: 176.50 kN (39,679 lbf). Specific impulse: 342 s. Specific impulse sea level: 294 s. Burn time: 341 s. Height: 2.33 m (7.63 ft). Diameter: 0.95 m (3.10 ft).

Oxidizer to Fuel Ratio: 2.5. Chamber pressure: 12 Mpa (1700 psi).

Wikipedia Entry

A high efficiency/high thrust environmental friendly rocket engine was an objective within 1986's Program 863. But Chinese industry was not mature enough to produce such a rocket until they obtained examples (and probably documentation) of the Russian RD-120 in the early 1990. Development of the YF-115 began in the 2000s, along with its sibling, the bigger YF-100, which would power the CZ-5, CZ-6 and CZ-7 boosters and first stages. Testing was directed by the China National Space Administration (CNSA) commencing in 2005. Development works were mainly carried out by the Xian Aerospace Propulsion Institute. The YF-115 was used as the upper stage engine for China's next generation of medium and light environmental-friendly launch vehicles, the CZ-6 and the CZ-7. During early 2012, the engine system successfully passed vacuum testing. It was China's first upper stage rocket engine to adopt a staged-combustion cycle.

In the CZ-6 upper stage a single YF-115 is used with gimbaled mounting. The CZ-7 upper stage used four engines, two fixed and two wgimbaled.