What is the risk arising in a vertical autorotation with a subsequent increase in airspeed prior to the landing?

Question

Question PPL(H) - Private Pilot License - Principles of Flight (Helicopter)

QuizVDS · Accepted Answer

Misjudgement when increasing the airspeed

QuizVDS · Answer

High rotor RPM

QuizVDS · Answer

Vortex ring state

QuizVDS · Answer

Loss of the tail rotor efficiency

Id 710 - PPL(H) EN - What is the risk arising in a vertical autorotation with a subsequent increase in airspeed prior to the landing?