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Ground Effect - Theory and Practice (1937)
NASA Technical Reports Server (NTRS) · leaf 36
Fig. 1 N.A.C.A. Technical Memo rand-am No. 828 … x--. Biplane alone o Plate 38 mm below lower wing ™{~ Reflection 76 mm between lower wings Airspeed 12.19 m/sec Wings of biplane 76 x 457 mm2 Figure 1.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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