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Accelerated Stalls

Gemini Sparkle

Key Takeaways:

  • Pilots often mistakenly believe published stall speeds apply universally, leading to "accelerated stalls" when the critical angle of attack is exceeded during increased G-loading, such as in steep turns, causing stalls at airspeeds well above the normal 1G stall speed.
  • Accelerated stalls occur because increased G-loading (e.g., in a turn or abrupt pull-up) requires a higher angle of attack to maintain altitude, making the wing stall at a higher indicated airspeed than its 1G stall speed.
  • These stalls are more aggressive, occur at higher airspeeds, and provide a significantly narrower margin between stall warning and actual stall, demanding quicker recovery action.
  • Maintaining coordinated flight during high-G maneuvers is crucial to prevent dangerous spin entry, which is a common and often fatal outcome of uncoordinated accelerated stalls at low altitudes.
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One of the reasons pilots so frequently lose control in flight is they forget—or never were properly instructed—that an airplane’s published stall speed applies only when at gross weight, in a specified configuration and in level, 1G flight. Perhaps they believe that as long as their airspeed indicator shows a value above the bottom of the green arc, they can’t stall. So they wrack their Skyhawk into a steep turn to look at something on the ground, pull back on the yoke to maintain altitude and forget about angle of attack or increased G-loading.

The frequent result—an accelerated stall with too little altitude in which to recover—has become so common it has its own name: a moose-turn stall, after the classic loss of control accident when pilots try to orbit at low altitude over wildlife. Accelerated stalls, of course, have nothing to do with adding full power and watching the airspeed increase. “Acceleration” in this instance refers to the additional G-loading an airplane sustains in a constant-altitude turn. The simple fact is the airplane’s wing always stalls when we exceed its critical angle of attack, and to maintain altitude, we have to increase AoA when G-loading increases.

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