Page 636 - PPL-engelsk 2025

Flight performance and planning

The starting point of the tangent is where the x and y axes intersect, i.e. where

the speed is 0.

If there is a strong headwind, the tangent should be drawn from a point to the

right of the intersection of the axes, corresponding to the wind speed. The tangent

will then intersect the red line at a higher speed. It is necessary to use it when
there is a headwind. Then you will be in the headwind for a shorter time.

Something else is a situation with a tailwind. The curve should be drawn from the

starting point to the left of the 0 point, and the tangent's intersection will then

show that you should fly at a lower speed in the tailwind to achieve the greatest

range. You will then also have been in the tailwind for a longer time and benefit

from it.

Values for Endurance and Range are most often given in table form.

Here is an example of such

a table from a Cessna172
manual.

The greatest range is at
12500 feet at 2300 rpm.

The maximum endurance

(flight time with full tanks)

cannot be read, but must
be found at 2500 feet, or

below, and approximately

2000 rpm.

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Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 636