High bypass geared turbofan engines with nacelles forming the propulsion system for short-haul passenger aircraft were tested for use in externally blown flap-type aircraft. System noise levels for a four-engine, UTW-powered aircraft operating in the powered lift mode were calculated to be 97.2 and 95.7 EPNdB at takeoff and approach, respectively, on a 152.4 m (500 ft) sideline compared to a goal of 95.0 EPNdB.
Quiet Clean Short-Haul Experimental Engine (Qcsee) under-the-Wing (Utw) Composite Nacelle Test Report. Volume 2: Acoustic Performance
1979
124 pages
Report
No indication
English