Settling with power
I once deliberately entered a Vortex ring, as a demonstration to a student, in an Iroquois (Bell 204) at about 3000 ft. The entry was achieved by hovering downwind, descending and introducing power. When established the aircraft descended at approx 2500 ft/min, shook and rattled, and the cyclic was slack and ineffective. A moment of panic ensued when I discovered that the supposed recovery technique of selecting forward cyclic had no effect whatsoever, and we had already lost more than 1000 ft. I selected full pedal (left I think), and after a second or so the aircraft suddenly spun around into wind, and I was able to dive out and recover. From then on the Vortex ring topic was discussed in the classroom only, as far as I was concerned.