YF-90
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| Country of origin | China |
|---|---|
| Associated LV | Long March 9 |
| Predecessor | YF-77 |
| Status | In development |
| Liquid-fuel engine | |
| Propellant | Liquid oxygen / Liquid hydrogen |
| Mixture ratio | 6.0 (±5%) Variable |
| Cycle | Staged combustion cycle |
| Pumps | 2 |
| Configuration | |
| Nozzle ratio | 100 |
| Performance | |
| Thrust, vacuum | 2,200 kilonewtons (490,000 lbf) |
| Thrust-to-weight ratio | 46.7 |
| Specific impulse, vacuum | 453 seconds (4.44 km/s) |
| Dimensions | |
| Length | 6.1 metres (20 ft) (With Engine Mount) |
| Diameter | 2.87 metres (9 ft 5 in) |
| Dry mass | 4,800 kilograms (10,600 lb) |
| References | |
| References | [1][2][3] |
The YF-90 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a staged combustion cycle. It is China's first hydrogen-oxygen engine to use the staged combustion cycle and is expected to be used for the second stage of the Long March 9, which is a three-stage rocket with boosters.[4][5] The engine has advanced features such as variable thrust, multiple ignitions, and automatic fault diagnosis.[2]
