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New method of extrapolation of the resistance of a model planing boat to full sizeThe previously employed method of extrapolating the total resistance to full size with lambda(exp 3) (model scale) and thereby foregoing a separate appraisal of the frictional resistance, was permissible for large models and floats of normal size. But faced with the ever increasing size of aircraft a reexamination of the problem of extrapolation to full size is called for. A method is described by means of which, on the basis of an analysis of tests on planing surfaces, the variation of the wetted surface over the take-off range is analytically obtained. The friction coefficients are read from Prandtl's curve for turbulent boundary layer with laminar approach. With these two values a correction for friction is obtainable.
Document ID
19930094410
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Sottorf, W
Date Acquired
September 6, 2013
Publication Date
March 1, 1942
Report/Patent Number
NACA-TM-1007
Accession Number
93R23330
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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