Page 453 - PPL-engelsk 2025

Principles of flight

- Angle of attack: The angle between the chord and the free wind.

- Setting angle (not shown): The angle between the chord and the aircraft's

longitudinal axis. It only matters in aircraft construction.

- Chord: The longest line from the leading edge to the trailing edge of the

profile.

- Midline: A (curved) line halfway between the upper and lower surfaces of

the wing.

- Profile thickness: The thickness of the profile at its thickest point,

expressed as a percentage of the chord length.

- Curvature: The greatest perpendicular distance from the chord to the

midline. Measured as a percentage of the chord.

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5.3.6 Lift

When an airflow passes over

a wing, lift is generated.

This force acts perpendicular

to the free airflow and the

wing.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 453