Buoys – rafts – and aquatic devices – Water skimming or walking device – Surfboard
Patent
1991-03-15
1993-08-24
Oberleitner, Robert J.
Buoys, rafts, and aquatic devices
Water skimming or walking device
Surfboard
114288, B32B 3114
Patent
active
052384349
ABSTRACT:
A textured bottom surface is provided for bodyboards of the type which have a semi-rigid foam core and which are used to ride on waves such as ocean surf with the rider in a prone or procumbent position. The improved bottom surface comprises a plurality of discreet depressions formed in the bottom of the bodyboard, numbering at least 50-depressions over the entire bottom surface, and preferably numbering more than 1500 such depressions. The depressions are believed to generate bubbles in the air-water mixture passing beneath the board which help reduce the shear forces in the water. The effect is called air lubrication and results in reduced drag and greater speed, as well as a lighter "feel" for the board on water. A bodyboard incorporating the improved bottom surface, and a bottom skin for bodyboards which includes the texturing depressions, are disclosed. A method of forming the textured bottom skin is also disclosed.
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Pp. 32, 33 and 50 from "Boats," Mar. 1960.
Bartz Clifford T.
Kransco
Oberleitner Robert J.
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