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Descriptions:
The "Credible Sport" phase I program was initiated by the OSD directorate
and was designed to validate S.T.O.L. approach configuration and
associated avionics.
Hercules 74-1683 was modified so it could take off and land almost like
a helicopter. The aircraft was equipped with lift rockets slanting
downward, slowdown rockets facing forward. The aircraft was intended for
use in Iran to rescue American hostages. During a STOL demonstration
flight the pilot fired the upper set of slowdown rockets at a height of
40 feet, instead of 20 feet at usual. The navigator was trained to fire
the lower slowdown rockets three seconds later, just after touchdown.
