A wing-in-ground effect configuration was investigated. The configuration used large diameter, low pressure ratio fans mounted about 0.76 wing chord ahead of the wing leading edge to achieve a power augmented ram wing during operation in ground effect. Tests of both in and out of ground effect aerodynamic transition characteristics from very low speeds to cruise speeds are described. The investigation provided a number of conclusions concerning the aerodynamic/propulsive performance interaction. While power augmented lift is required for low speed flight, there is a thrust loss when the efflux is trapped under the wing which reduced the effective thrust to weight available for acceleration by about a third of the installed thrust to weight ratio.
Powered Low-Aspect-Ratio Wing in Ground Effect (Wig) Aerodynamic Characteristics
1979
52 pages
Report
No indication
English
Aerodynamics , Aircraft , Aircraft design , Ground effect (Aerodynamics) , Jet lift , Jet thrust , Powered lift aircraft , Propulsive efficiency , Seaplanes , Aerodynamic coefficients , Aircraft landing , Boundary layer control , Lift fans , Nacelles , Pitching moments , Takeoff , Thrust-weight ratio , Wind tunnel tests , Wing flaps , Wing-fuselage stores