Page 639 - PPL-engelsk 2025
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Flight performance and planning
The glide distance will be the same!
The best glide speed for the aircraft here is 55 knots.
The glide distance is the horizontal distance an aircraft moves while gliding. To
achieve the longest distance, flaps should not be used.
Conversely, if you want a shorter distance, flaps should be used to the extent that
suits the distance.
7.7.1.1 Glide ratio
In connection with gliding, the term ‘glide ratio’ also exists. The glide ratio is
determined by the ratio of lift to drag at a specific angle of attack.
The glide ratio is found as the vertical distance to the terrain divided by the glide
distance.
The glide ratio for
the aircraft here is
therefore:
500:1000 = 1:2
A typical glide ratio for a motor aircraft is 1:10.
This means that if you are at 3000 ft, the aircraft can glide 30,000 ft
(corresponding to approx. 4.9 NM).
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 639
