Definition
A drawing that represents forces or motions as arrows, where each arrow's length shows the magnitude (size) of the force and its direction shows the direction in which the force acts. In aviation, vector diagrams are used to illustrate how the four forces of flight — lift, weight, thrust, and drag — interact during different phases of flight, such as a climb.
Plain English
A picture that uses arrows to show which way different forces are pushing or pulling on the airplane, and how strong each one is. Longer arrow = bigger force. The arrow points the way the force is acting.
Context Anchor
Seen in Airplane Flying Handbook explanations of climbs, turns, and other flight conditions where the forces on the airplane are being shown visually.
Derivation
Vector comes from the Latin vector, meaning 'carrier' or 'one who conveys.' In math and physics it came to mean a quantity that 'carries' both a size and a direction. That is exactly what each arrow in the diagram does — it carries information about how much force and which way.
Why Pilots Care
It clarifies why increasing power or adjusting pitch produces a climb and helps avoid common errors in climb technique.
Analogy
It is like using arrows on a weather map to show where the wind is blowing and how strong it is. The arrow’s direction matters, and its length or size helps show the amount.
Intuition Check
Do not read a vector diagram as a literal picture of the airplane’s path through the sky. It is a simplified force picture: arrows show direction and relative size, not every detail of the actual flight.
Example Sentence 1
The instructor drew a vector diagram on the whiteboard to show how thrust, drag, lift, and weight balance during a steady climb.
Example Sentence 2
Referring to the vector diagram helps the pilot visualize how excess thrust determines the climb angle.