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Ground Effect on the Take-off and Landing of Airplanes (1935)
NASA Technical Reports Server (NTRS) · leaf 34
(Reflection versus flat plate method) X Biplane alone O Plate 38"below lower wings + Reflection 76rein "between lower wings Air speed, 12.19 m/sec. Wings of "biplane, 76 x 457 ran2 … -4 0 4 6 12 i, degrees Figure 5.- Airfoil U.S.A. 27, grotuid at l/2 chord, Figure 4.- Cushioning effect on airplanes in wind speed 48.27 kn/hr. proximity of the ground.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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