The May '04 of the Smithsonian's Air & Space magazine carries an
interesting
article on the development of the QT-2 "spy plane" in the late 60s during
the
Vietnam War.

A great story and testament to SAC's service to military and research
airframe needs. Nothing to do with motorgliders, however, and the "first'
of those goes back much further, to the Nelson Hummingbird, Bowlus
Dragonfly... and the motorized gliders at the Rhoen late1920's.

The core of one of the prototype QT-PCs (also X-26B), N2472W, flies happily
today at Boulder, restored as one of the nicest SGS 2-32s around (S/N 67,
IIRC). It gave another couple of "double" rides today. As a nostalgic nod
by its restorer, Bruce Miller, it wears a Lockheed decal and project
airframe serial number as well as a SAC logo. Come fly it at Mile High
Gliding!