---ggeret4111
Chapter 1
25
CO5653421 UNCLASSIFIED
CL-282 design was essentially a jet-propelled glider capable of attain-
ing the altitudes that he felt were necessary to carry out reconnais-
sance of the Soviet Union successfully:"
Upon his return east on 8 August, Donovan got in touch with
James Baker and suggested an urgent meeting of the Intelligence
Systems Panel. Because of other commitments by the members, how-
ever, the panel did not meet to hear Donovan's report until 24
September 1954 at the Cornell Aeronautical Laboratory. Several
members, including Land and Strong, were absent. Those who did at-
tend were upset to learn that the Air Force had funded a closed com-
petition for a tactical reconnaissance plane without informing them.
But once Donovan began describing Kelly Johnson's rejected design
for a jet-powered glider, they quickly forgot their annoyance and lis-
tened intently.
Donovan began by stressing that high-altitude reconnaissance
aircraft had to fly above 70,000 feet to be safe from interception.
Next, he set out what he considered to be the three essential re-
quirements for a high-altitude spyplane: a single engine, a sailplane
wing, and low structural load factors. Donovan strongly favored
single-engine aircraft because they are both lighter and more reli-
able than multiengine aircraft. Although a twin-engine aircraft could
theoretically return to base on only one engine, Donovan explained,
it could only do so at a much lower altitude, about 34,000 feet,
where it was sure to be shot down.
The second of Donovan's essential factors, a sailplane wing (in
technical terms a high-aspect-ratio, low-induced-drag wing), was
needed to take maximum advantage of the reduced thrust of a jet en-
gine operating in the rarefied atmosphere of extreme altitude. Because
of the thinness of the atmosphere above 70,000 feet, engineers esti-
mated that the power curve of a jet engine would fall off to about 6
percent of its sea-level thrust.
Finally, low structural load factors, like those used by transport
aircraft, were necessary to reduce weight and thereby achieve maxi-
mum altitude. Donovan explained that strengthening wings and
Donovan interview (S)
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UNCLASSIFIED