Analysis of information sources in references of the Wikipedia article "Vortex ring state" in English language version.
Settling with power (vortex ring)
Vortex ring state (formerly referenced as settling-with- power) describes an aerodynamic condition in which a helicopter may be in a vertical descent with between 20 and 100 percent power applied, and little or no climb performance. The previously used term settling-with-power came from the fact that the helicopter keeps settling even though full engine power is applied.
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: CS1 maint: location missing publisher (link)recognition and avoidance of settling with power/vortex ring state