Questions tagged [vortex-ring-state]

A vortex ring, also called a toroidal vortex, is a torus shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal.

Filter by
Sorted by
Tagged with
0
votes
1answer
251 views

Can a helicopter enter Vortex Ring State In Auto Rotation? [see qualifiers]

If you are in a vertical descent [no wind] with rotor at max RPM Auto, and you abruptly pull full collective, the momentum of the blades will drive air down creating down wash. Now obviously this is ...
9
votes
2answers
515 views

Can a VTOL jet such as the Harrier enter a Vortex Ring State?

I'm curious, because they obviously don't have those huge rotors pushing the air away, but they are still getting their upward thrust from somewhere. My gut says, yes, but it is more difficult. Is ...
3
votes
1answer
780 views

Why is vortex state impossible in autorotation?

An article at Skybrary states that for a vortex ring state to occur: The aircraft has to be in powered flight. If the engines are not producing power, the aircraft is in autorotation and the upflow ...
13
votes
2answers
7k views

What is “settling with power” and how does it differ from vortex ring state?

I've always heard these terms used interchangeably. I figured that "settling with power" was what the pilot did to cause the vortex ring state (VRS). But comments on another question indicate that ...
4
votes
2answers
479 views

What are the symptoms of vortex ring state?

What are the signs and symptoms a pilot can recognize, that the helicopter is approaching vortex ring state (VRS) and measures should be taken? A related question discusses how to prevent or recover ...
20
votes
4answers
4k views

How do modern helicopters tackle Vortex Ring State?

According to the wikipedia page : Air vortices can form around the main rotor of a helicopter, causing a dangerous condition known as vortex ring state (VRS) or "settling with power". In this ...