ACS Alignment

FAA-S-ACS-29 — Flight Instructor, Rotorcraft–Helicopter · Area of Operation II. Technical Subject Areas · Task: D & E — Principles of Flight; Flight Controls

HI.II.D.K1 — helicopter aerodynamics (lift, dissymmetry, translating tendency) HI.II.D.K2 — translational lift, ground effect, autorotation aerodynamics HI.II.E.K1 — collective, cyclic, antitorque pedals & throttle/governor HI.II.E.R1 — teaching control coordination & common errors

⚑ FLAG (Walter): combines Technical Tasks D and E — confirm HI. codes against the current FAA-S-ACS-29.

Principles of Flight & Flight Controls

Teach why the helicopter flies — rotor aerodynamics and the unique hazards — and what each control does.

By the end of this lesson you can:

Explain helicopter aerodynamics: lift, dissymmetry of lift, translating tendency, and torque.
Explain translational lift, ground effect, and autorotative flow at a teaching level.
Describe the flight controls (collective, cyclic, antitorque pedals, throttle/governor) and their effects.
Teach control coordination and anticipate the common student errors.

1 · Rotor aerodynamics

Teach how the rotor makes lift and the helicopter-specific effects: dissymmetry of lift (advancing vs. retreating blade, managed by flapping), translating tendency (tail-rotor thrust drift), torque and the antitorque system, and gyroscopic precession. Tie each to what the student feels and corrects in the aircraft.

2 · Translational lift, ground effect & autorotation

Explain effective translational lift (efficiency gain through ~16–24 kt), ground effect (less power required IGE), and the aerodynamics of autorotation (upward airflow driving the rotor with the engine disengaged). These concepts underlie nearly every maneuver and emergency you will teach.

3 · The controls

Control	Primary effect
Collective	Changes all-blade pitch → power/thrust (height).
Cyclic	Tilts the rotor disc → direction/attitude (position & speed).
Antitorque pedals	Tail-rotor thrust → heading/yaw (counter torque).
Throttle / governor	Manages engine/rotor RPM (often governed).

Teach that the controls are interrelated — a change on one usually requires coordination on the others.

4 · Watch

Curated reference clip — “Principles of Flight — Helicopters” · The Aviator (YouTube), verified via oEmbed. Embedded with the creator’s player; we don’t host or alter it.

5 · Reference sources

Use the authoritative references

📄 Helicopter Flying Handbook (FAA-H-8083-21) — Aerodynamics & Flight Controls 📄 Pilot’s Handbook (FAA-H-8083-25) — Principles of Flight

Your aircraft: control rigging/feel and the governor system are aircraft-specific — note the R44 control and governor specifics from the POH (Systems).

✍️ Fill in for the aircraft you fly the R44 control/governor specifics you teach and the typical coordination errors you watch for — look these up in the R44 POH and confirm with your CFII.

⚑ FLAG (Walter): the R44 is VFR-certificated; confirm any aircraft-specific values you teach from the current R44 POH, and confirm all endorsement wording against AC 61-65 and 14 CFR Part 61.

Risk management (the “Consider”): the teaching risk is leaving aerodynamics abstract — students who can’t connect dissymmetry of lift, translational lift, or torque to what they feel will mismanage the controls. Tie every concept to a control input and a sensation, and teach coordination from the first hover.