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What is a vortex ring state?

By ETL August 16, 2018 Aerodynamics, Flight Conditions / Maneuvers, Helicopter Performance

A vortex ring state is when the helicopter’s downwash recirculates into the induced flow and the helicopter descends while under power.

What are the three primary regions of the disc in an autorotation?

By ETL August 16, 2018 Aerodynamics, Flight Conditions / Maneuvers

The three primary regions of the disc in an autorotation are the stalled, driving, and driven.

What is the purpose of the flare at the end of an autorotation?

By ETL August 16, 2018 Aerodynamics, Flight Conditions / Maneuvers

The flare at the end of an autorotation is to arrest the decent.

What is the height-velocity diagram?

By ETL August 16, 2018 Helicopter Performance

The height-velocity diagram is provided by the aircraft manufacturer and indicates speeds that should be avoided as a safe autorotation might not be possible.

How do changes in center of gravity (CG) affect helicopter flight characteristics?

By ETL August 16, 2018 Helicopter Performance

The aircraft manufacturer sets the helicopter’s center of gravity limits. If operating outside of these limits, the helicopter may be uncontrollable in certain situations.

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Autorotation Coriolis effect Dissymmetry of Lift Drag ETL Lift LTE Relative Wind

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