EC82-20536
The NASA JetStar research aircraft (top) is followed by a NASA Learjet equipped with acoustic sensors during one of several tests of advanced propellers mounted on the vertical pylon atop the JetStar’s fuselage. Several advanced prop designs were tested on the JetStar in 1982 by NASA’s Dryden Flight Research Facility (DFRF), Edwards, Calif., to study the effects of noise created by propellers on aircraft structures and cabin interiors. To assess possible noise problems with the subscale turbofan, DFRF technicians mounted microphones on both the JetStar and the Learjet chase plane. DFRF then made measurements at close range and at longer distances. The data enabled structural changes and flightpath modifications.August 30, 1982NASA Photo› Jetstar Fact Sheet