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Principles of flight
Flaps may only be used in the “white” arc of the airspeed indicator. The aircraft
stalls at a lower speed, but also at a lower angle of attack when flaps are used.
When you fold out the flaps, you get a larger angle of attack, which means that
the wing stalls at a lower angle of attack compared to the basic profile.
5.4.4.2 Side effects of using flaps
When the flaps are extended, the conditions change so that the nose of the
aircraft pitches up or down. You then must trim the aircraft to get the nose of
the aircraft back into the correct position.
When overshooting:
- full throttle
- safe speed
- flaps to take off setting
- climb with VX until obstacle passed
- at safe height flaps up
5.4.4.3 Slots and slats
Slots/slats are mounted
on the wing leading
edges.
The purpose is to
provide a greater angle
of attack before stall
occurs.
Here are different flap
and slot designs.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 474
