The last machine I was paid to fly had an APU (auxillary power unit). The APU was made by Sundstrand and works basically like a big fat turbocharger. It has a centrifugal compressor.
For the APU to start it is spun up by an electric motor (which reverts to a generator after the start sequence). Once it hits a certain RPM the APU FADEC will start the igniter and dump in the fuel and off it goes. Being spun up by a motor easily gets the compressor section to produce enough airflow (no fuel being burned, no heat involved) to get the whole thing up to a point where it can sustain itself.
The APU compressor is oversized enough to not only run itself but also generate airflow for main engine start and will run both air conditioners (air cycle machines).
So what drives a turbocharger? Pressure gradient across the turbine section which results in flowing gases.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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