Why did the party flag unfold smoothly under the helicopter during the centenary celebration? Special fabrics, "wind pocket" design, "seven steps to success"
The Helicopter Institute organized a gathering to watch the celebration of the 100th anniversary of the founding of the Communist Youth League of China
The domestic high-speed helicopter successfully made its first flight in 2019 with a speed of over 500 kilometers per hour, replacing the Z-10 and Z-20