Helicopter aerodynamics

rotary wings and control system that generates the lift and thrust for a helicopter

thumb|upright=1.14|Airflow through a helicopter rotor. Above, the rotor is powered and pushing air downward, generating lift and thrust. Below, the helicopter rotor has lost power, and the craft is making an emergency landing.

Aerodynamic condition related to helicopter flight

imbalance helicopter rotation when the blades become bunched in the rotational plane, typically on the ground when the landing gear is prevented from freely moving

torus-shaped vortex in a fluid or gas

in-flight visual impairment by pilots

loss of lift in rotary wing aircraft where the retreating rotor blade has a lower relative blade speed combined with an increased angle of attack

potential dangerous event during helicopter flight

Term in rotorcraft aerodynamics

mathematical process by William Froude