Definition
An engine accessory that uses energy from the engine's exhaust gases to drive a turbine, which spins a compressor that forces additional air into the intake system. The denser intake charge allows the engine to produce more power than it could when breathing naturally, and to maintain sea-level power at higher altitudes where the surrounding air is thinner.
Plain English
A device that uses the engine's exhaust to spin a small fan, which packs more air into the engine. This lets the engine make full power even when flying high, where the air is thin.
Context Anchor
Seen in engine operation, high-altitude performance, and power-setting discussions for turbocharged airplanes.
Derivation
From 'turbine' (a wheel driven by flowing fluid or gas) plus 'charger' (something that loads or fills). The name describes its job: a turbine that charges the engine with extra air. 'Turbine' comes from the Latin 'turbo,' meaning a spinning thing or whirlwind.
Why Pilots Care
Allows a piston engine to maintain near-sea-level power at higher altitudes, improving climb performance, cruise speed, and the ability to operate over mountains.
Grounding Statement
As the airplane climbs and the outside air gets thinner, the turbocharger helps pack enough air into the engine for it to keep producing useful power.
Intuition Check
A turbocharger does not make the airplane a turbine airplane. It is a part on a piston engine that helps the engine breathe better.
Example Sentence 1
Because the airplane has a turbocharger, the pilot was able to maintain full rated power while climbing through 16,000 feet.
Example Sentence 2
The preflight checklist included verifying that the turbocharger wastegate was operating freely before the high-altitude flight.