Definition
A turbine engine fitted with movable nozzles that can swivel to redirect the engine's exhaust gases in different directions, allowing the thrust to be aimed downward, rearward, or anywhere in between. This redirection of thrust enables an aircraft to perform short or vertical takeoffs and landings, and to maneuver in ways a fixed-nozzle engine cannot.
Plain English
An engine whose exhaust nozzles can be turned to point the thrust in different directions, so the aircraft can lift straight up, hover, or fly forward depending on where the thrust is aimed.
Context Anchor
Seen in powerplant and aircraft systems discussions for aircraft that use movable exhaust flow for special takeoff, landing, or control capability.
Derivation
Vector' comes from the Latin 'vehere,' meaning 'to carry,' and in physics a vector is a quantity with both size and direction. A vectored-thrust engine is one that can carry its thrust in a chosen direction, rather than only straight out the back.
Why Pilots Care
Vectored thrust changes how an aircraft accelerates, climbs, and handles at low speeds. Pilots and maintenance technicians working with these engines must understand that thrust direction itself is a flight control, with implications for performance, ground handling, and safety during transition between hover and forward flight.
Analogy
It is like holding a garden hose: the water flow may stay about the same, but pointing the hose in a different direction changes where the force goes.
Intuition Check
Do not read “vectored” as meaning the engine is simply more powerful. Here it means the engine’s pushing force can be aimed in a different direction.
Example Sentence 1
The Harrier uses a vectored-thrust engine to take off vertically and then transition to forward flight.
Example Sentence 2
During vertical takeoff the vectored-thrust engine directs exhaust downward to lift the aircraft off the ground.