On Sept. 22, Qianyi Aerospace held a project review for the SY (Shiye)-300FF, a
300‑ton‑class LOx‑methane full‑flow staged‑combustion rocket engine. A panel of
domestic liquid‑rocket experts vetted the engine’s technical specifications,
development schedule, feasibility, manpower and equipment plans, and core
technologies, and agreed to approve the project to proceed to follow‑on
development.