Page 462 - PPL-engelsk 2025

Principles of flight

When driving your car and wanting to reduce speed, you ease off the accelerator,

but here you need to give more throttle to fly slower (or faster).

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5.4 Stall and spinner (Flyveprincipper 2 - 2 videoer)

5.4.1 Stall

Stall can be defined as a situation where the critical angle of attack for the given
airfoil has been exceeded.

Click the image to view the animation.

It can occur at any speed and in all flight
attitudes.

Use the rudder to keep the wings level when maneuvering near the stall

boundary.

Result:

- Loss of lift on the upper surface of the wing

- Large wake vortex, leading to:

o High profile drag

o The center of pressure moves forward on the airfoil, which degrades

stability

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 462