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Power-On Stalls

The power-on stall is the takeoff stall. You fly it at altitude so that the one you might meet a few hundred feet above the runway is something you have already seen and already recovered.

Slow Flight, Stalls and Spins — FI.X.D

Why you practice it

Stalls are unsettling the first few times, and the way past that is understanding exactly what the wing is doing. Practiced at altitude, a stall is one of the very few things that go wrong in an airplane and stay entirely inside your control — you put the wing there, you have height underneath you, and you can take it back. That is the whole reason the maneuver exists: recognition and recovery, and nothing else. Height is the part the real one may not give you, which is exactly why the rehearsal happens up here.

Picture the moment just after liftoff — full power, departure configuration, airspeed low, nose climbing past anything the airplane can sustain. Rotate too aggressively, or chase a climb the airplane cannot deliver on a hot, high day, and the wing reaches its critical angle a few hundred feet above the runway with nowhere to go. The practice buys you one thing down low: recognition at the first indication, and a recovery that begins before you have spent height you do not have.

One boundary before you go and fly it. The power-on stall is yours to practice and to be tested on, and so is the accelerated stall from the commercial certificate onward — an instructor teaches it to you first, but it is a task you fly yourself on the commercial and flight instructor practical tests. The stalls standing next to those in the syllabus — secondary, cross-controlled and elevator trim stalls, and spins — are instructor demonstrations, flown with a qualified flight instructor, at altitude, in an airplane approved for them. They appear in this lesson as the things that happen when a recovery goes wrong, not as maneuvers to go and try on your own.

What is actually happening

A stall is an aerodynamic condition: smooth airflow over the wing is disrupted and lift is lost. It happens when the angle of attack — the angle between the chord line and the relative wind — exceeds the wing's critical angle of attack. Nothing else defines it. You can exceed that angle at any airspeed, in any attitude, at any power setting, and the power-on stall is the proof: full throttle and a climbing attitude protect you from nothing.

Separation starts at the trailing edge of the upper surface and spreads forward as the angle increases; when it covers the wing, lift collapses. Training airplanes are built to make that progression readable, with the root stalling before the tip — by geometric twist, which is washout, or by changing the airfoil along the span, or by stall strips on the leading edge, depending on the airplane. However yours achieves it, it keeps airflow over the ailerons and hands you buffet and roll control while the stall is still developing.

What full power does to the picture

High power at low airspeed is where the left-turning tendencies are loudest. P-factor and the spiraling slipstream both yaw the nose left, and torque reaction rolls the airplane left rather than yawing it directly. Gyroscopic precession belongs on the list only with the pitch direction attached: it acts ninety degrees ahead in the direction of rotation, so it yaws the nose left when the pitch is going down, and in a stall entry, where you are pitching up, its small contribution works the other way. All of it arrives as one demand — a firm and steadily increasing right rudder as the airspeed decays.

That rudder is the maneuver in miniature. Arrive at the break with yaw in the airplane and one wing is at a higher angle of attack than the other, so it drops — and a stall with yaw in it is how a spin begins.

How close you already were depends on load factor, weight and center of gravity. Bank, and stall speed rises with the square root of the load factor; fly it heavy or with a forward CG and the wing already sits at a higher angle for the same airspeed. None of that moves the critical angle — only your margin.

Flying it

1. Complete your maneuver checks and clear the area. Pick an entry altitude that lets you finish the recovery no lower than 1,500 feet AGL.
2. Slow to the takeoff or departure speed in your POH and set that configuration.
3. Set the entry power your evaluator assigns. The ACS puts a floor under it — no less than 65 percent of available power — so treat that figure as a minimum inside an assigned setting, not as a number the maneuver is flown at. Establish a stabilized climb on a visual reference outside.
4. Smoothly raise the nose to an attitude that will induce a stall and hold it there — an abrupt pull adds load factor and gets you a different stall.
5. Keep it coordinated with right rudder. Hold heading within 10 degrees straight ahead, or the selected bank within 10 degrees and never past 20 in the turning version.
6. Call the first indication out loud — whatever your airplane gives you first, the stall warning device or the buffet — then take it to the point asked for.
7. Recover in this order: reduce the angle of attack until the stall warning stops, level the wings with coordinated aileron and rudder, then set power — the maximum your POH allows for the recovery, which is a separate call from the entry setting above.
8. Set the climb configuration, accelerate to Vx or Vy, then return to your entry altitude, heading and airspeed.

Recognizing it

Recognition is what you are really buying, and it comes through three senses at once. You see the airspeed decaying and an attitude you would never accept on a normal departure. You hear the engine and airflow noise fall away, and the stall warning device speaks up — horn, light or shaker, depending on the airplane. You feel the controls go mushy and the airframe start to buffet. In the full stall the nose drops, a wing may drop with it, and the descent is not arrested by anything you do with back pressure.

Recovering

Pitch breaks a stall. Power does not. Lower the nose positively enough to get below the critical angle and hold it there until the warning stays off, level the wings with coordinated rudder and aileron, and only then bring in power — the maximum your POH allows for the recovery. That is not always the full stop of the throttle: in some airplanes too much power at that moment adds a nose-up pitching moment and delays the very recovery you are making. Then climb at Vx or Vy.

The hard part is that the real one happens near the ground, where every instinct tells you not to put the nose down. Put it down anyway. Until the wing is flying again, nothing else you do to the airplane matters. Recover the stall first, then set the climb.

What goes wrong

The recurring errors cluster there. Pilots level the nose without reducing the angle of attack enough and stay stalled. They reach for the throttle instead of the yoke. They pull back to stop the altitude loss before the wing is flying and buy a secondary stall — the mistake your instructor will produce on purpose, at altitude, so that you meet it there first — or let nose-up trim do the pulling for them, which is the same mistake with your hands off it.

The other cluster is coordination. If a wing drops, stop the yaw with rudder rather than picking the wing up with aileron: a down aileron on the low wing raises its angle of attack and deepens the stall on the wing you were trying to save. And keep looking outside — over-reliance on the airspeed indicator and the slip-skid indicator is a common error precisely because the horizon and the pedals answer sooner.

Two things stack the odds against you in the real thing: turbulence or wind shear can shift the relative wind enough to reach critical angle at a speed that looked safe, and high density altitude flattens the climb you keep pitching for.

Where you meet it next

On the checkride this is a Slow Flight and Stalls task at the private and commercial levels, and again on the flight instructor practical test, where you teach it aloud from the right seat. The evaluator watches your coordination and your first-indication callout as closely as your tolerances.

It also sits alongside the stalls that are this same wing at this same angle with something added. The accelerated stall is that wing reaching the critical angle at a higher airspeed under load, and from the commercial certificate on it is yours to fly rather than watch — taught to you by an instructor, then flown by you on the commercial and flight instructor practical tests. The secondary stall, the cross-controlled stall, the elevator trim stall and spin awareness stay with a qualified instructor, at altitude, in an airplane approved for them. Its mirror image is the power-off stall, the landing stall, where the same angle is reached at idle on approach, and slow flight is the lesson that lives just short of both. Fly the pair and what sits under all of it becomes obvious: the wing does not care what the throttle is doing. The rest of the ground school library is here.