'China Cloud Arrow'), also known as JZYJ, is a Chinese rocket engine design and production startup based in Beijing.
[4][5] In 2019, launch startup Linkspace signed a contract with Jiuzhou Yunjian to supply engines for their hopper test vehicles.
The same year, Jiuzhou Yunjian also signed a contract to provide engines for Rocket Pi's Darwin-1 reusable launch vehicle.
[2] In 2021, the company announced a collaboration with Rocket Pi to provide propulsion systems for the Darwin-1 reusable launch vehicle.
[10] Space Epoch has conducted tests on a stainless-steel propellant tank, which will be integrated with Jiuzhou Yunjian's Longyun-70 engine.