Longyun (rocket engine) should not be confused with Lingyun (rocket engine).
| Lingyun | |
| Status: | Under development |
| Throttle Range: | 30%~100% |
| Type: | Liquid |
| Thrust(Vac): | 770.2kN |
| Thrust(Sl): | 686.5kN |
| Specific Impulse Vacuum: | 350s |
| Specific Impulse Sea Level: | 290s |
| Dry Weight: | 880kg (1,940lb) |
| Notes: | [1] |
The Longyun (lit. Dragon Clouds) is a gas-generator cycle rocket engine burning liquid methane and liquid oxygen under development by Jiuzhou Yunjian.
In 2018, the gas generator test for the Longyun engine was completed.[2] The engine completed multiple start-up hot test runs in May 2021.[3] In October 2021, launch startup Rocket Pi signed a deal to use the Longyun engine to power its Darwin-1 reusable launch vehicle.[4]
Space Epoch conducted a ground test of a 4.2-meter stainless steel stage powered by the Longyun engine in January 2023.[5]
In April 2024, Longyun passed a long duration hot firing test with the servo mechanism rotating to the maximum angle of ±8°. The engine has also reportedly passed the customer acceptance test.[6]