The development of propfan-powered aircraft has been observed with great interest. It is obvious that during cruising flight, the aircraft powerplant (propellers) cause a noise clearly perceivable on the ground. It is the audible frequency spectrum of the propfan powerplants relative to the high tip speeds that presents the problem. A flight test was conducted on 30 April, 1989 at the Frankfurt Airport. Results of the test flight are present.
En Route Noise of Turboprop Aircraft and Their Acceptability: Report of Tests
1990
20 pages
Report
No indication
English
En Route Noise of Two Turboprop Aircraft
NTIS | 1990
|En route noise of two turboprop aircraft
NTRS | 1990
|