It got so close I could feel the downwash.

However, the downwash is purely a function of the circulation only.

As we dropped lower, the downwash hit the beach.

The result is a region of downwash behind the aircraft, between the two vortices.

The downwash from the rotors caused the sea to bowl around it.

They were concerned that the strong propeller downwash would make it difficult to operate.

This permits a lower downwash velocity for a given amount of thrust.

It stayed there for several seconds, the trees flexing under the downwash.

But it seemed to me that my pilot could've waited until I was clear of his rotor downwash before he took off again.

The downwash at any given station is a function of the entire shed vortex system.

As the Chinook lifted, its downwash created a major sandstorm.

Roaring engines and the downwash of its rotor made speech impossible.

The vibrations through the airframe diminished as we rose out of the ground effect from the downwash.

The rear wing was higher than the forward one to avoid downwash and give ground clearance for the propellers.

Essentially, the helicopter descends into its own downwash.

An aircraft produces aerodynamic lift by deflecting air downwards as downwash.

Measuring the momentum transferred to the downwash is another way to determine the amount of lift on the airfoil.

The trailing vortices are responsible for the component of the downwash which creates induced drag.

The helicopters could not travel above 50 mph to ensure the safety of the extra passengers from rotor downwash.

It was still light and we could see the downwash of the rotors kicking up a fierce sandstorm as the helicopter took off.

Created by helicopter rotor downwash, it continues to cause aircraft accidents and remains a high risk to flight safety.

His eyes went outboard again, seeing only snowflakes being churned by the downwash of the rotor tips.

The downwash from the rotors raised a storm of sea spray, which was soaking him, and now it carried away his hat.

The integral equation over the span of the wing to determine the downwash at a particular location is:

In this state, the helicopter is operating in its own downwash, descending through descending air.