A single-engine class B aeroplane has the following wind limitations:
Crosswind: 17 kt
Headwind: 30 kt
Tailwind: 10 kt
Consider a take-off from runway 20 with wind from 255°.
Using trigonometry, determine the maximum wind speed which allows to stay below the crosswind limit of 17 kt and take-off.
(2 decimal places for the calculations)
Refer to figure.
The wind components may be calculated using sin or cos.
Sin a = opposite side / hypotenuse
The angle between the wind and the runway direction is 55°.
We need to calculate the hypotenuse of a triangle whose opposite side (crosswind) equals 17 kt:
- Hypotenuse = 17 / sin 55° = 20.75 kt, to stay below the limit 20 kt would be the correct answer.
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