China’s Long March-8A carrier rocket successfully conducted its maiden flight recently, according to China Aerospace Science and Technology Corporation (CASC).
One of the elements that made the launch possible was the newly developed YF-75DA expander cycle hydrogen-oxygen engine, designed by CASC’s Sixth Academy.
The Long March-8A features a core first stage, core second stage and two boosters. The Sixth Academy provided four YF-100 kerosene-liquid oxygen engines, two YF-75DA hydrogen-oxygen engines and an auxiliary power system for the rocket. Compared to the Long March-8, the new rocket boasts greater payload capacity and efficiency, with the YF-75DA engine serving as a key upgrade.
To meet the rocket’s structural and performance demands, the YF-75DA underwent significant advancements in thrust and weight optimization. It delivers over 10 percent more thrust than its predecessor, the YF-75D, while a system-level redesign has reduced engine weight, significantly improving the thrust-to-weight ratio. These innovations enhance China’s hydrogen-oxygen rocket technology, solidifying its position on the global stage.
(Executive editor: Wang Ruoting)
