NASA NTRS · 19870000384
Redundant Control for Air-Circulation Valves
Abstract
Four computers that control airflow to "X-wing" helicopter rotor arranged in redundant configuration. Ensures circulation control of rotor continues to function even if two of computers fail. Rotor uses 48 valve actuators regulating distribution and quantity of air flowing from leading and trailing edges.
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Johnson, R., Jr., Trustee, B., Fischer, W.. 1987-09-01. Redundant Control for Air-Circulation Valves. https://ntrs.nasa.gov/citations/19870000384
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