Mach 3+

Mach 3+ describes the first major NASA project involving the Blackbirds. Conducted with the U.S. Air Force (USAF) as a partner, the NASA-USAF YF-12 research program lasted 10 years, and produced a wealth of data on materials, structures, loads, heating, aerodynamics, and performance for high-speed aircraft.

More than two decades after the program ended, no comprehensive history of the joint program had been written. This monograph is an attempt to rectify that deficiency. Until recently, security restrictions prevented the release of some information relative to the YF-12. Since then, numerous documents have been declassified, and program participants are free to speak about previously restricted aspects of the project.

Unfortunately, some who contributed to the NASA/USAF YF-12 investigations have not outlived the blanket of security that covered their work. Those who have must reach back more than 20 years to retrieve anecdotes and historical details. In a sense, the oral history interviews in this monograph amount to a sort of salvage archeology into the fading memories of the remaining YF-12 participants.

Over the years, numerous books and articles have been written about the Blackbirds, but few give more than a brief description of the YF-12 and its role as a research aircraft. In this monograph, Merlin briefly describes the origins of the Blackbird family of aircraft and how NASA became involved with them. Each of the following chapters then describes a facet of the NASA/USAF YF-12 research program in detail.

This monograph would not have been possible without access to numerous technical reports (some recently declassified), briefings, and other source material from the NASA Dryden Historical Reference Collection, as well as the oral interviews that fleshed out the story and provided an insider's view of the project. The book is the 25th publication of the NASA Monographs in Aerospace History series. It is available from the NASA Dryden Flight Research Center, Edwards, California.