autorotation
/ˌɔːtoʊroʊˈteɪʃən/
noun
- The action of a helicopter rotor spinning freely using air flow, allowing a controlled descent when the engine is not providing power.
- The helicopter made an emergency landing using autorotation.
- Autorotation is a critical skill for helicopter pilots to master.
- During autorotation, the rotor blades continue to turn and provide lift.