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to create a 12-meter yacht had been win

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back the America's Cup winning States

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was an achievement realized by skipper

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Dennis Conner his winning team and the

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boat Stars and Stripes on February 4th

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1987 many enthusiasts felt that the loss

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of the America's Cup warriors earlier to

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the Australians was due to a failure to

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in an effort to ensure that the

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Americans had the faster vote in the

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final rounds at this year's competition

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many changes were made the design team

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led by John Marshall elected to make use

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of an drag reduction technology called

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riblets developed by NASA's Langley

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Research Center and manufactured by the

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Priyanka these sheets of pin vinyl

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plastic placed on the underside of stars

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and stripes are actually microscopic

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scratchers perfect triangular each

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running the entire length of the button

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John Marshall explains the boat itself

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looks a little bit like the Space

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Shuttle in the sense that the surface is

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paved would be separate plaques of

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Riblet material rather than having a

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meticulously smooth surface this is an

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intentionally rough surface and it is

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the microscopic roughness that makes it

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work and that leads to testable drag

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reductions in a variety of different

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research by placing a small section of

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the 3m Riblet film under a high-powered

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microscope it's easy to see the riblets

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and their near-perfect triangular groove

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the idea for rivets came out of research

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to modify airplane

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with less resistance same researchers

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also found that some sharks have Riblet

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like skin that allows them to glide

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effortlessly through the water

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reporting Langley's Ben animals we noted

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from some Russian literature that

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certain sharks have a structure or skin

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structure very similar to a Riblet

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structure you look at these things under

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microscope there are tiny be shaped

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grooves aligned with the flow of the

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right scale according to our Windtunnel

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experiments to reduce drag only the fast

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sharks have these the slow sharks do not

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it was engineer Mike Walsh who

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originated research on riblets at

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langley the microscopic v grooves were

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first studied on machined aluminum

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plates in this low speed wind zone 3m

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then developed a way to put riblets on

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vinyl test samples of the Riblet film

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have been flown by Boeing aircraft

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company and aboard a NASA Learjet to

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confirm its efficiency according to Ben

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Enders the reduction of skin friction by

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rivets is on the order of 6 to 8%

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luckily in proceedings for the airline

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industry in the estimate that comes

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savings for the US commercial airline

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fleet at roughly 300 million dollars per

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year since it's lighter than paint 3m is

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also looking at the riddle of material

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as a protective coating for our plant

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because the technology is new there are

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still many unanswered questions but

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scientists feel that riblets can be used

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in a postive applications the natural

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gas pipelines the submarines and

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racecars nasa's Riblet technology a

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high-tech solution that helps keep