Drag reducing surface depressions

Details Drag reducing surface depressions Drag reducing surface depressions

1990-12-27

1992-12-15

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428141, 428212, 114 67R, 114288, 244123, 244124, 244126, 244130, B32B 300, B63B 134, B64C 138

Patent

active

051716232

ABSTRACT:
Fluid friction of a body moving through air or water is reduced by means of a plurality of symmetrical depressions on the surface of the body. The symmetrical depressions are closely spaced but not quite abutting. The symmetrical depressions are sized in proportion to the width of the body. For a cylindrical body, each symmetrical depression is between one fiftieth and one fortieth of the diameter of the body. The symmetrical depressions are shallow, ten to twenty times wider than they are deep. The symmetrical depressions are shaped like sections of truncated cones, or hexagonal prisms, or geodesic domes. The symmetrical depressions cover virtually the entire surface of the body.

REFERENCES:
patent: 2261558 (1941-11-01), Orloff
patent: 3319593 (1967-05-01), Papst

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