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Ground Effect on the Take-off and Landing of Airplanes (1935)
NASA Technical Reports Server (NTRS) · leaf 34
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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