Flight Test describes the work of the author’s late father, Ralph William Waechter, and those with whom he worked at Avro Aircraft Limited. Ralph Waechter’s work at Avro included Machmeter calibration and aircraft performance analysis. The book reproduces and explains key excerpts from documents that Ralph Waechter retained after leaving the company. Among these documents was a report on the Avro Arrow’s highest speed flight. The book is intended for readers with an interest in aeronautical technology and its historical development. While the main text is written for the general reader, additional information for the technically inclined reader can be found in sidebar articles, figure captions, and Avro report excerpts. This approach makes the book accessible to a fairly wide readership while also making it a valuable resource for historians of science and technology. Chapters 5 and 9 are more technical than most, but they are worthwhile reading for those who wish to know more about how the Arrow’s airspeed was measured (chapter 5) and how its performance was assessed (chapter 9).