YF-115

YF-115
Country of originChina
First flightLong March 6 inaugural flight (2015-09-20)
DesignerAcademy of Aerospace Liquid Propulsion Technology[1]
Associated LVLong March 6 and Long March 7[2][3]
StatusIn service
Liquid-fuel engine
PropellantLOX[4] / RP-1[4]
Mixture ratio2.5[4]
CycleOxidizer-rich Staged combustion[4]
Configuration
Chamber1[4]
Performance
Thrust, vacuum176.5 kN (39,700 lbf)[citation needed]
Thrust, sea-level147.1 kN (33,100 lbf)[citation needed]
Chamber pressure12 MPa (1,700 psi)[4]
Specific impulse, vacuum341.5 seconds (3.349 km/s)[4]
Dimensions
Length2,325 millimetres (91.5 in)[4]
Diameter946 millimetres (37.2 in)[4]
Used in
Long March 6 second stage and Long March 7 second stage.[2][3]

The YF-115 is a Chinese liquid rocket engine burning LOX and kerosene in an oxidizer-rich staged combustion cycle.[4] A high efficiency/high thrust environmental-friendly rocket engine was always an objective within Programme 863. Development began in the 2000s, along with its sibling, the bigger YF-100, which would power the LM-5, LM-6 and LM-7 boosters and first stages.[5][6][7] Testing was directed by the China National Space Administration (CNSA) commencing in 2005. Development works are mainly carried out by the Xi'an Aerospace Propulsion Institute. It will be used as upper stage engine for China's next generation of medium and light environmental-friendly launch vehicles, namely the Long March 6 and the Long March 7.[5][6][7] During early 2012, the engine system successfully passed vacuum testing.[8] It is China's first upper stage rocket engine to adopt the staged-combustion cycle.

In the LM-6 upper stage it will use a single YF-115 with gimbaled mount. While the LM-7 upper stage will use four such engines. But in this latter case, two engines will be fixed and two will be gimbaled.[citation needed]

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