China's High-thrust Oxyhydrogen Engine Completes Calibration Test A calibration test for the high-thrust oxyhydrogen rocket engine for the Long March-5B Y4 carrier rocket was carried out successfully on Monday, the Sixth Academy of China Aerospace Science and Technology Corporation (CASC) said. The engine being tested this time is the last one for the Long March-5B Y4 carrier rocket. It will be delivered to the final assembly of the rocket for this year's experiment module launch mission for the