Yes, I can post these books in some book group.
But do you peruse every book group every day?
If you want it, let me know.

(cover attached)

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Mach 3+: NASA/USAF YF-12 flight research, 1969-1979
By Peter W Merlin
Publisher: NASA Publication 2002
154 Pages
ASIN: B0006RPZCA
PDF
8 MB


During the 1950s, American aircraft designers emphasized configurations
that flew increasingly high and fast, a trend that continued for nearly
two decades. Then, during the 1970s, efficiency, noise reduction, and
fuel economy also became important considerations, in part because
military analysts no longer deemed speed and altitude the paramount
capabilities necessary to ensure national security.
Among the aircraft designs that transitioned from paper to hardware
during the high-speed era, the Lockheed Blackbirds hold a unique place.
The A-12, YF-12A, M-21, D-21, and SR-71 variants outperformed all other
jet airplanes in terms of altitude and speed. To this day, they remain
the only production aircraft capable of sustained cruise in excess of
Mach 3. Developed in utmost secrecy, they eventually became some of the
world’s most famous aircraft.
Conceived originally as spyplanes, several Blackbirds saw service with
the National Aeronautics and Space Administration (NASA) as research
platforms. This monograph 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 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 has yet 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, I briefly describe
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.

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