So,in deference to the fact that probably the purchaser of the book will not have access to a machine shop, or a test stand to make roaring noises and the occasional explosion, there are animations at the beginning of the cd, with cutaways of engines and modelling of the fuel droplets as they bounce around inside the chamber. If you add values that are not in the "desirable" range, you can merrily explode your little engine. It is, in fact, a lot more fun than you would expect from the very precise description on the Amazon site. If you plan on being a part of a commercial space program, I would think this might be required reading. You do need a computer to "read" it of course, and to run the animations. And it's a Windows cd.
The illustration above is based on a photograph taken by one of the astronauts of the last Apollo mission to the moon, and is done in acrylic, around 8 inches by 14 (it's cropped a little here.)