Settling with power — vortex ring state, VRS — is one of those topics that gets explained ten different ways and recovered ten different ways depending on which decade your instructor learned it. Let's strip it down.
The three conditions
You need all three simultaneously. Miss any one and you're not in VRS. The handbook lists them in slightly different orders; the substance is the same:
- Powered descent — typically 20–100% power applied. You are not in autorotation.
- Rate of descent at or above ~300 fpm — fast enough that the rotor's downwash starts to recirculate.
- Airspeed below ETL (effective translational lift, roughly under 16 knots) — slow enough that you're sitting in your own column of disturbed air.
If a witness asked you "were you descending fast, slow, and on the power" — and you can answer yes to all three — you've described VRS. Take any one of those out and you have a different problem.
The classic recovery
The book recovery is: lower the collective slightly, push the cyclic forward to gain airspeed, and as you fly out of your own vortex through ETL, recover power. It works. It's also expensive in altitude — typically 100–500 feet depending on aircraft and entry severity. If you noticed VRS at 200 AGL setting up to a confined area, the book recovery is going to put you in the trees.
The Vuichard recovery
Claude Vuichard's technique trades altitude loss for a brief lateral acceleration. In a US-rotation helicopter (advancing blade on the right):
- Raise collective to max continuous power.
- Right cyclic roughly 10–20° of bank.
- Left pedal as needed to maintain heading against the increased torque.
The aircraft slides sideways out of the disturbed air column — typically in 1–3 seconds — and the rotor finds undisturbed lift again. Reported altitude losses are often under 50 feet. The catch: it requires retraining, and if you fly a CCW-rotation aircraft (most European designs) the lateral inputs reverse.
Further reading
What it actually feels like
Three things at once: a low-frequency vibration (the recirculating tip vortices hitting the rotor), a noticeable increase in descent rate that doesn't respond to collective, and — if you're paying attention — a change in the engine note as power is added without translating to altitude. The "doesn't respond to collective" part is the diagnostic. Pulling more pitch worsens VRS because it strengthens the recirculating column.
How you actually get into it
Almost always one of three setups: a downwind approach where you bleed off airspeed faster than expected, a steep approach where you let the rate of descent build, or a high hover OGE in a confined area where you let the wind shift behind you. The common thread: you stopped flying through the air and started falling through it.
Which recovery to teach
Both. The ACS expects the classic technique because it's universally applicable and doesn't depend on aircraft rotation direction. Vuichard belongs in the toolbox for low-altitude entries where the classic recovery would put you in terrain. Knowing only one is fine for the checkride; knowing both is what flies you home.