What is a vortex ring state?
A vortex ring state is when the helicopter’s downwash recirculates into the induced flow and the helicopter descends while under power.
Blog: Helicopter Performance
What is loss of tail rotor effectiveness (LTE)?
Loss of tail rotor effectiveness, commonly referred to as LTE, is when the ability to provide anti-torque thrust from the tail rotor is ineffective or highly unreliable.
Why are left pedal turns often considered safer?
More power is required for left pedal turns. If a left turn can be completed, there is enough power available to safely control the helicopter in the current flight conditions.
What is the height-velocity diagram?
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.
What is total drag?
Total drag is the sum of parasitic drag, profile drag, and induced drag.
What is the proper airspeed to fly for the best possible range?
When flying for range, operate the helicopter at the speed for least amount of drag.
What is the proper airspeed to fly for endurance?
When flying for endurance, operate the helicopter at the speed using the least amount of power.
How does density altitude affect helicopter performance?
A high-density altitude decreases helicopter performance.
How do changes in center of gravity (CG) affect helicopter flight characteristics?
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.
How does a helicopter perform in-ground effect vs. out of ground effect?
The rotor disc becomes more efficient within close proximity of the ground, so it takes less power to provide the same amount lift.