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edited Sep 2, 2014 at 14:21

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The APU consumes less fuel because it doesn't have to contribute thrust to the airframe.

Many APUs have the same generator capacity as a propulsion engine. But they don't produce thrust. They can run at an optimum RPM for the generator requirements.

A320

                   APU
Ground operations: 130 kg/hour           90 kVA
FL200:             65 
FL300:             51

On a short flight each main engine might consume an average of 1260 kg/hour.

The APU consumes less fuel because it doesn't have to contribute thrust to the airframe.

Many APUs have the same generator capacity as a propulsion engine. But they don't produce thrust. They can run at an optimum RPM for the generator requirements.

The APU consumes less fuel because it doesn't have to contribute thrust to the airframe.

Many APUs have the same generator capacity as a propulsion engine. But they don't produce thrust. They can run at an optimum RPM for the generator requirements.

A320

                   APU
Ground operations: 130 kg/hour           90 kVA
FL200:             65 
FL300:             51

On a short flight each main engine might consume an average of 1260 kg/hour.

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created Sep 2, 2014 at 14:14

RedGrittyBrick

26.4k
3
89
136

The APU consumes less fuel because it doesn't have to contribute thrust to the airframe.

Many APUs have the same generator capacity as a propulsion engine. But they don't produce thrust. They can run at an optimum RPM for the generator requirements.