Wind Components

Wind approaching a runway or flight path can be treated as a vector and split into two perpendicular parts: one along the path of travel and one across it. The component along the track is found with cosine because it is adjacent to the angle between the wind and the track, while the sideways component uses sine because it is opposite that angle. This works because a wind vector and its two perpendicular components form a right triangle.

Use this when landing, taking off, or navigating and you need to know how much of the wind helps or hurts your forward motion versus how much pushes you sideways. It is common in aviation performance checks, runway selection, and crosswind planning.

• Using sine for the headwind and cosine for the crosswind
• Forgetting that the angle must be measured from the runway/track, not from the perpendicular
• Rounding too early and getting noticeably different component values