Chang'an.
At the Aerospace 6th Institute's test stand, the YF135 bidirectional gimballed reusable prototype engine was undergoing a 1500-second long test fire.
The engine outputted more than 400 tons of thrust at a flow rate that reached 110%, consuming over 2 tons of fuel every second, making a rumble so loud that it felt like the ground was shaking and the mountains were swaying.
Under such circumstances, the hydraulic gimbal mechanism was still swaying with the control signals, testing the performance of the engine in various steering ranges.
"This is the new generation of ultra-high-thrust liquid oxygen kerosene rocket engines we are developing, with a maximum sea-level thrust of over 4,000 kilonewtons, on par with the K380 engine.
