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9.8.1.1 Converting speed, time, distance

Speed, time and distance are inherently dependent on each other. If two of the

factors are known, the last one can be found on the computer.

In practice, this is done by placing the two known numbers above/below each
other in the correct way.

Here it is important to remember that the speed must be found on the fixed

part of the computer, while the time is found on the time scale – that is, on the

rotating part. The three factors must have the same unit!

The speed we calculate on this side of the computer is always GS!

Conversion from GS to TAS and vice versa is done using the slider and the other

side, as the mutual relationship between GS and TAS depends on the current
wind.

The reading of GS is done in the grommet, while we read TAS on a speed circle.

9.8.1.2 Conversion of measurements

When converting measurements, the distance scale is used as a designation,

while the minute scale is used for numbers.

In practice, this is done by placing numbers under the given designation and
reading the converted number under the desired designation.

9.8.1.3 Calculating fuel consumption

When calculating fuel consumption, the minute scale is used as a time scale,

while the distance scale is used as fuel consumption.

In practice, we move the minute scale until the known minute number is below

the consumption determined for this purpose. You then read off new

consumption over the desired number of minutes or vice versa.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 856