Page 452 - PPL-engelsk 2025
P. 452
Principles of flight
In front, the air is sucked over the profile.
As the air flows over the profile, its speed and direction increase, resulting in a
downward airflow (downwash) after it leaves the trailing edge.
Profiles are designed
differently depending on
the performance required.
If you need a wing for an aircraft that takes off at relatively low speeds, the profile
shown below provides a large amount of lift.
The profile in the middle generates less lift at the same speed but has lower
profile drag, allowing for a higher top speed.
The profile on the far right is symmetrical and allows for inverted flight. This is
used in high-performance aircraft for aerobatics.
In flight, we are very happy for the lift and do everything we can to keep drag as
low as possible.
5.3.5.3 Wing profiles and lines
To compare profiles, various lines are given names (see the diagram on the next
page):
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 452
