Drone Design :
The Bladeless Drone is aptly named for its brilliant design that ditches dangerous blades for air ducts. It features four bladeless “propellers.” The main propeller (easily missed) is positioned in the center and responsible for most of the ducted flow to support take-off and landing. Three other propellers control the direction of the drone. Additionally, each propeller is programmed to work based on the amount of headwind received.