On a True Heading of 090° the aircraft experiences drift of 5°S. On a True Heading of 180° the aircraft experiences no drift. On both headings the TAS is 200 kt and it is assumed that the wind is the same.
What is the experienced wind speed and direction?
Refer to figure.
It is possible to find a W/V by use of drift only, though it requires the pilot to fly on 2, or preferably, 3 headings which cut at a large angle to each other. This technique is known as the “multi-drift wind”.
| Heading | Drift |
| 090° | 5°R |
| 180° | 0° |
1. With the flight computer, align the 180º heading under TRUE INDEX and set TAS 200 kts under the centre dot.
Draw a line along the whole length of the 0º drift line.
2. Maintaining the TAS 200 kts under the centre dot, align the 90° heading under TRUE INDEX and draw a line along the length of the 5°R drift line.
3. These 2 lines will intersect at the wind point.
Rotate to the 6 o’clock position to measure the wind speed and direction: 360°/17 kts.
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