What is a Vortex Ring?

Vortex Ring, (sometimes called ‘settling with power’ or ‘power settling’) is a flight condition in which a helicopter that is receiving power from its engine(s) loses main rotor lift and subsequently experiences loss of control. Recognition that this condition is developing can be difficult and the onset quick. All helicopter types are vulnerable to it and it can occur at any height outside ground effect. An understanding of how and why it develops is the best protection from an encounter.