Sikorsky multi-purpose transport helicopters fly in the usa, japan and even in antarcticaSikorsky multi-purpose transport helicopters fly in the USA, Japan and even in Antarctica
The refueller refuels two helicopters in the air at the same timeThe refueller refuels two helicopters in the air at the same time
Unmanned aerial helicopter with real-time video shootingUnmanned aerial helicopter with real-time video shooting