The Helicopter and the Ground Effect Machine
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[1] Montgomery Knight,et al. Analysis of ground effect on the lifting airscrew , 1941 .
[2] Marion K Taylor. A Balsa-Dust Technique for Air-Flow Visualization and Its Application to Flow Through Model Helicopter Rotors in Static Thrust , 1950 .
[3] Von Glahn,et al. Exploratory Study of Ground Proximity Effects on Thrust of Annular and Circular Nozzles , 1957 .
[4] A Power Plant Man's Look at the Ground Effect Machine , 1959 .