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Turbojet engines, like any turbine engine are always very noisy because of the way they work.

Turbine engines do not have an enclosed combustion chamber like other engines, rather they have a fairly open-ended system. As burning fuel creates heat and expansion, it is used to propel an impeller which thus generates thrust. This system is highly dependent on air being able to quickly and easily enter and exit the engine in very high volumes. It is not possible to reduce the engine noise without also constricting this airflow and thus reducing the power output.

It is possible to make quiet turbojet engines, but making them quieter also makes them heavier and less powerful as well as reducing fuel efficiency.

Turbojet engine and aircraft designers must walk a fine line between noise reduction and performance.

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