Mar 1930 n 557 47 p 51 figs.: Method employed was developed by A. Betz; principles upon which it is based and testing methods employed; present report contains results thus far obtained and is intended to form basis of further tests; absolute accuracy is not claimed for values given. Mar 1930, n 558 31 p 61 figs: Survey of present status of scientific knowledge of causes which produce drag, in order, if possible, to establish relation between individual results and actual phenomena which demonstrate fundamental importance of surface conditions; discussion embraces boundary layer, skin friction, form drag; application of profile drag measurements; roughness; high-pressure wind-tunnel test. Bibliography. Translated from Luftfahrtforschung, May 18, 1928.
Measurement of profile drag on an airplane in flight by the momentum method
Nat. Advisory Committee Aeronautics -- Tech. Memo
1930
Report
Englisch
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