---
title: "Turbofan engine — aviation glossary — OnlyPlanes"
description: "A gas-turbine engine in which a fan produces a substantial part of the thrust."
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Engines

# Turbofan engine

TERM · Engines

At a glance

## Meaning of Turbofan engine

A gas-turbine engine in which a fan produces a substantial part of the thrust.

### More about Turbofan engine

The fan moves air through both the core and bypass paths. The core provides energy to drive the rotating system as well as contributing exhaust thrust.

The balance between these flows varies by engine design. A turbofan differs from a turboprop, where most useful shaft power drives an external propeller.

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