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Why does a wing stall? (demo)

Aerospace engineeringIntroductoryDemo content

A pilot says an aircraft stalled because it was flying too slowly. Explain whether that is accurate and what actually causes a wing to stall.

Sample answer

Partly. A wing stalls when the angle of attack goes past the critical angle and the airflow separates from the upper surface, so lift drops. Low speed matters because you need a higher angle of attack to make enough lift, but you can stall at any speed.

Sample evaluation

Demonstration feedback. No grading key is configured, so this score comes from keyword matching and is not a real evaluation.
Overall
74/100
REV 1
Summary

Sample evaluation shown for layout only. The answer correctly ties stall to angle of attack and flow separation but does not mention load factor or flaps.

Rubric
  • Technical accuracy
    weight 40
    90

    Correctly identifies separation at the critical angle of attack.

    “airflow separates from the upper surface”
  • Reasoning and trade-offs
    weight 25
    75

    Explains why low speed correlates with stall without equating the two.

    “you can stall at any speed”
  • Completeness
    weight 20
    35

    No mention of weight, load factor, or flaps changing stall speed.

  • Clarity and structure
    weight 15
    80

    Gives a direct answer first, then explains.

    “Partly.”
Correct
  • Stall is tied to angle of attack and separation
    “angle of attack goes past the critical angle”
Missing
  • Stall speed rises with weight and load factor
  • Flaps raise CLmax and lower stall speed
Study nextAerodynamics
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