Definition
Turbojets are jet engines in which all of the air drawn in passes through the compressor, combustion chamber, and turbine, with thrust produced entirely by the high-velocity exhaust gases leaving the rear of the engine. Aircraft powered by these engines are commonly called turbojets as well.
Plain English
A turbojet is a pure jet engine that makes thrust by squeezing air, burning fuel with it, and shooting the hot exhaust out the back at high speed. The whole airplane is often called a turbojet too.
Context Anchor
Seen in high-performance aircraft descent planning, especially when deciding when to start down from cruise altitude so the aircraft can meet altitude and speed limits later in the procedure.
Derivation
From 'turbine' (the spinning bladed wheel inside the engine) plus 'jet' (a fast stream of fluid). The name describes how the engine works: a turbine drives the compressor, and the result is a jet of exhaust that pushes the aircraft forward.
Why Pilots Care
Affects how quickly the aircraft accelerates or decelerates and how much fuel is burned during descent, directly shaping the vertical path and speed profile a pilot must fly.
Grounding Statement
A turbojet aircraft descending from high altitude is not like a slow car rolling down a hill; it may need many miles to lose altitude and slow down in a controlled way.
Intuition Check
Do not confuse “turbojet” with a piston engine that has a turbocharger. A turbojet is a jet engine; a turbocharged piston engine is still a piston engine with added air compression.
Example Sentence 1
Because turbojets burn fuel quickly at low altitude, the crew planned a high-altitude cruise to improve range.
Example Sentence 2
Pilots of older turbojet aircraft watch exhaust gas temperature closely during a rapid descent to avoid exceeding limits.