The Central Intelligence Agency and Overhead Reconnaissance; The U-2 and OXCART Programs, 1954-1974

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Sec1et NOFORN
Chapter 6
invention of synthetic lubricants. Lockheed also had to search long
OXCART production facilities
and hard for a hydraulic fluid that would not vaporize at high speed
but would still be usable at low altitudes. Finding a suitable hydraulic
pump was just as difficult. Kelly Johnson finally modified a pump
that was being developed for North American's B-70 bomber
.
: 1
proJect.
Some of the greatest problems related to the high speeds and
high temperatures at which the OXCART operated resulted from
working with the material chosen for the airframe-titanium. After
evaluating many materials. Johnson had chosen an alloy of titanium
:, Johnson. --Devdopm.:nt ot Lockh.:.:<l SR-71." pp. I 1- I2.