Definition
A graphic representation of the relationship between an aircraft's heading and true airspeed, the wind direction and speed, and the resulting track and groundspeed. The three vectors form a triangle that allows a pilot to solve for any unknown side or angle when the other elements are known.
Plain English
A simple drawing made of three arrows that shows where the aircraft is pointing, where the wind is pushing it, and where it actually ends up going. By drawing or calculating these three arrows together, a pilot can figure out the heading to fly and how fast they will travel over the ground.
Context Anchor
Seen in cross-country flight planning, navigation calculations, and discussions of wind correction and groundspeed.
Derivation
Called a triangle because the three vectors -- aircraft motion through the air, wind motion, and resulting motion over the ground -- always close into a three-sided figure when drawn to scale.
Why Pilots Care
It gives the pilot the exact heading to fly and the ground speed to expect, so the destination is reached on time and on course.
Analogy
Think of swimming across a river. You aim slightly upstream, the current pushes you sideways, and you arrive on the far bank along a different line than you were pointing. The wind triangle is the same idea drawn on paper for an aircraft in moving air.
Grounding Statement
If the airplane is pointed one way and the air mass is moving another way, the wind triangle shows the path the airplane will actually make over the ground.
Intuition Check
Do not think of the wind triangle as the airplane flying a triangular route. It is a calculation picture that uses a triangle shape to show how airplane motion and wind combine.
Example Sentence 1
During flight planning, the student solved the wind triangle to find a heading of 265 degrees and a groundspeed of 110 knots.
Example Sentence 2
After solving the wind triangle, the estimated time of arrival was updated using the new ground speed.