‘Sharkskin’ to make planes faster and greener

MicroTau 'sharkskin' patches being applied to plane wing
MicroTau 'sharkskin' patches being applied to plane wing

The Clean Energy Finance Corporation (CEFC) has made a $5.6 million investment in MicroTau’s ‘sharkskin’ technology developed with the help of the Australian National Fabrication Facility (ANFF).

Sharks famously swim smoothly and quietly, helped by their unique skin with thousands of overlapping layers of tiny ‘scales’ or denticles to reduce their drag in the water.

Mimicking sharkskin structure on airplanes reduces turbulence, increases flying speed, and cuts fuel emissions and cost. Unfortunately, it is excruciatingly difficult to replicate the microscopic grooves and bumps with traditional manufacturing.

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MicroTau has solved this puzzle using specialist laser manufacturing technology to rapidly produce the shark skin pattern in a light-curable material onto large, self-adhesive patches. The CEFC funding will allow them to scale-up manufacturing and grow their team of scientists, engineers, and business development specialists. 

MicoTau founder Henry Bilinsky says the expanded team will pursue certification to produce parts for wide-body aircraft, bringing his ‘sharkskin’ film a step closer to market. 

Scales of a great white shark, otherwise known as dermal denticles, protect the skin and give hydrodynamic advantage

“Were we to apply our film to an Airbus A380 today, a single flight from Sydney to LA would save $8,554 in fuel and 18,018kg of CO2 emissions. Thousands of dollars per flight adds up to millions over the life of the aircraft. 

“That’s just using current technology to retrofit an existing plane. We could see efficiency improvements as high as 10 per cent as we refine the design.”

Bilinsky’s idea for ‘Direct Contactless Manufacturing,’ which creates microscopic ridges called ‘riblets’, was the winning entry in a 2015 US Airforce open innovation competition. But making his idea a reality would be a hugely challenging process. 

“The grooves between riblets for aircraft are about 50 microns wide, or half as wide as human hair. On the other hand, we need hundreds of square metres of riblets to cover a plane wing, so we have to work at the micro and macro scale at the same time,” he explains. 

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To solve this problem, MicroTau turned to ANFF-NSW’s Research & Prototype Foundry based at the University of Sydney. 

The Foundry has million dollars of highly specialised manufacturing equipment available to researchers and industry, funded by the Australian government through NCRIS, the National Collaborative Research Infrastructure Strategy, State Government and the University of Sydney’s Core Research Facilities program. 

“Fast turnarounds and local production mean we can rapidly test and customise new optical components. We were able to quickly produce new designs at a low cost, something that would have otherwise taken months and thousands of dollars to do,” Bilinsky said.

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