`Pratt & Whitney single-crystal turbine blade`

Physical sample. Used to illustrate the $6-7K value of an aerospace component, electron-beam-drilled cooling passages, and the firing-temperature chart.

[Tom passes around a turbine blade cross-section.] This is about a thirty-year-old turbine blade — it's been split, they cut filleting just for display. Pratt & Whitney gave me this. It has internal cooling passages. This is a single crystal. If this was a good blade it'd be worth six or seven thousand dollars. It's not much good when you cut it open. It's an electron-beam hole drilled at different angles, and we'll talk a little bit more about that.