Overview

There is a moment that every engineer who works on jet engines knows well. It comes somewhere between the drawing board and the test stand, when the full weight of what they are attempting becomes clear. They are trying to build a machine that burns fuel at temperatures hotter than the surface of the sun - inside a device that spins faster than a bullet - that must also last for tens of thousands of hours without failure, weigh almost nothing, and cost something a commercial airline can actually afford. That moment is humbling. And it is the beginning of understanding why jet engines are, without qualification, among the most difficult artifacts human civilization has ever produced. This book is an attempt to explain that difficulty. Not in the abstract - as a vague gesture toward complexity - but in concrete terms: the metallurgical limits, the thermodynamic walls, the manufacturing tolerances measured in microns, the certification regimes that can take longer to navigate than it took to fight World War II. Each chapter peels back a layer of the problem, and by the end, the reader who started out wondering why a jet engine costs $30 million will instead be amazed that one can be built at all.

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