Low-g condition

Low-G condition affects helicopters with two-bladed main rotors, particularly lightweight helicopters.
Dynamic rollover in which the helicopter pivots around one of the skids and 'pulls' itself onto its side.

Gyroplanes also cannot fly safely under low-g conditions, such as a pitch-over maneuver commonly used in fixed-wing aircraft, due to excessive loss of rotor rpm and resulting rotor instability.