It's called the auxiliary power unit, and it's the smallest engine on the plane. But that doesn't mean it serves a small purpose. It provides the necessary power to start the plane's engines and ...

But even for the pacifists in the audience, it’s hard not to get excited about the idea of a low-cost open source turbine. Obviously an engine this small would have limited use to commercial ...

An auxiliary power unit (APU) is a small, self-contained power source that is used in land and rail vehicles as well as in ...