The titanium alloy grid fin adopts a honeycomb-like winglet structure with a rectangular frame and an internal angle of ±45°, resembling a "flyswatter". This design achieves the following functions through the coordinated work of multiple sets of thin winglets during the rocket's re-entry into the atmosphere:
High Aerodynamic Efficiency: The honeycomb structure can divide the airflow into small regions under supersonic conditions (such as Mach numbers ranging from 1 to 1.3), suppressing airflow separation and ensuring stable control forces during the transonic phase. Compared to traditional flat-plate rudders, it has a larger control moment, generating control force during deflection, resulting in a significant improvement in efficiency.
Lightweight structure: The hollow design reduces weight and meets the load requirements of the rocket recovery section.
Quick response: Multi-wing coordination achieves millisecond-level attitude adjustment, meeting the stringent requirements for precise control during the rocket recovery phase.