A FLIGHT INVESTIGATION OF THE WAKE TURBULENCE ALLEVIATION RESULTING FROM A FLAP CONFIGURATION CHANGE ON A B-747 AIRCRAFT
A flight test investigation was conducted to evaluate the effects of a flap configuration change on the vortex wake characteristics of a Boeing 747 (B-747) aircraft as measured by differences in upset response resulting from deliberate vortex encounters by a following Learjet aircraft and by direct measurement of the velocities in the wake. The flaps of the B-747 have a predominant effect on the wake. The normal landing flap configuration produces a strong vortex that is attenuated when the outboard flap segments are raised; however, extension of the landing gear at that point increases the vortex induced upsets. These effects are in general agreement with existing wind tunnel and flight data for the modified flap configuration.
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Corporate Authors:
Ames Research Center
National Aeronautics and Space Administration
Moffett Field, CA United States 94035 -
Authors:
- Jacobsen, R A
- Short, B J
- Publication Date: 1977-7
Media Info
- Pagination: 45 p.
Subject/Index Terms
- TRT Terms: Aerodynamics; Flaps (Aircraft); Flight tests; Landing; Passenger aircraft; Turbulence; Velocity; Vortices; Wakes; Wind tunnels
- Identifier Terms: Boeing 747 aircraft; Learjet aircraft
- Old TRIS Terms: Aerodynamic configurations; E-4a aircraft
- Subject Areas: Aviation; Vehicles and Equipment;
Filing Info
- Accession Number: 00174570
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-TM-73263, A-7116
- Files: TRIS
- Created Date: Mar 14 1978 12:00AM