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post #8 of Old 10-15-2016
RichH
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Re: Riblets

You'd need a more finely design than a textured roller, as riblets are vee grooves just a few thousandths of an inch deep. Most disclosed data from the time of '87 AC race was that riblets could possibly decrease overall drag/resistance (theoretically) by up to 8%; and, the bulk of the drag reduction was probably occurring at the first 30% of a hull/foil's length.

So without a 'textured roller', you could probably approach the form and shape of riblets simply with an '(very) open-coat' ~100-120 grit sandpaper ... IF you could maintain a constant pattern in a single pass of the paper and correctly aligned parallel with the flow of water along the hull/keel.

BUSINESS TECHNOLOGY - ADVANCES - 3M Coating Aids Yacht In Cup Effort - NYTimes.com

FWIW - Back in the late 80s, I tried the 100 grit open-coat paper on a burnished smooth teflon bottom paint (on a Melges-20 scow); and, found no noticeable difference (but one doesnt get much wake nor turbulence from a tunnel-hulled 'skimming-dish' scow, anyway). These scratches did promote faster fouling if the boat wasn't dry hauled.

Last edited by RichH; 10-15-2016 at 09:18 PM.
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