An example, plane flight on the route 300º at 350 KM/H TAS, navigator need estimate wind direction and speed, then:
- Fly the plane for 2 minutes in a course at 30º of flight course - or 270º and take note of drift.
- Then fly for 2 minutes in a course 30º for the left - or 300º and take note of drift.
The angle between the two legs need be 60º.
Assuming that drift measures in each leg is:
- The first measure is take at 270º, resulting in -4º.
- The second measure is take a 330º, and result in +6º.
Now in DREIECKRECHNER DR-3 disk, compass side set the black arrow cursor (that represents airplane heading) under 270º , the dark red line with red dot, is automatically placed under 330º since is set a 60º.
where is there a chase bank around me
Localize the marks - 4º and follow the faint blue line until this line intersect with the faint red line at +6º.
Now place the center line (orange) of blue cursor over this intersection point, the tail of blue arrow point show the wind direction = 293º.
The number of the circle more close to this intersection point, in this case is 15, that means that wind speed is 15% of plane TAS (15% of 350) = 52.5 km/H.
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