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🚁 How a Helicopter Lands Without Engine Power

Follow the energy trade that lets a helicopter descend, preserve rotor rpm, and land after engine power is lost.

lessons

~30 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

The power disappears above the groundExplain how autorotation begins when engine power is lost and why rotor rpm must be protected.A freewheeling unit separates the engine while lowered collective and descent create upward airflow through the rotor.
The descent is a controlled energy tradeDescribe how rotor aerodynamics, airspeed, weight, and landing-site choice shape an autorotation.The pilot trades altitude for rotor rotation and chooses speed and direction within the helicopter's performance envelope.
The flare turns rotation into a landingExplain how the flare and final collective raise use stored rotor energy to reduce descent and touch down.Near the ground, attitude, speed, collective, and heading must be coordinated within a narrow timing window.
The machine has limits, and the pilot has choicesDistinguish general autorotation principles from aircraft-specific emergency procedures and training risks.Rotor rpm limits, height, tail-rotor conditions, and aircraft design determine how a trained pilot applies the maneuver.

Questions this course answers

What provides the main rotor's energy during autorotation?

The helicopter descends so air flows upward through the rotor, driving the blades aerodynamically.

Why is collective lowered immediately after many engine failures?

Lower collective reduces lift and drag, allowing the aircraft to descend and helping preserve rotor rpm.

What is the flare for?

The flare changes attitude and uses forward motion and rotor energy to arrest the descent.

Why can generic autorotation numbers be misleading?

The approved flight manual for the specific helicopter defines its operating targets and procedures.

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