What should be the maximum descent rate during a helicopter autorotation?

The maximum descent rate during a helicopter autorotation is typically around 1200 feet per minute (fpm). This rate is a general guideline for maintaining optimal rotor performance and ensuring the best opportunity for recovery during an autorotation scenario.

When performing an autorotation, maintaining an appropriate descent rate is crucial for managing rotor RPM and ensuring that there is enough lift generated by the rotor blades while descending. A descent rate higher than this threshold could lead to insufficient rotor RPM, making recovery difficult upon nearing the ground. Conversely, a descent rate lower than this can lead to prolonged descent, which may increase the risk of landing outside of the intended area or impact.

Therefore, the value of 1200 fpm stands as a widely accepted limit for safe autorotation practices, allowing pilots to balance the descent rate with rotor efficiency and control.