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Price is not problem in competition gliders, also no problem with in maintenance surfaces like at ariliners. Very easy to wash glider before every race.

Riblets surface is proven that has lower frictional drag. https://www.witpress.com/Secure/elibrary/papers/1845640950/1845640950507FU2.pdf

Why gliders(full scale not models) not use riblets technology or even matte surface with sandpaper 1000(windsurfing industry use it long time ago)?

Has anyone try to sand surface and try compete against regular glossy gliders?

Birds wings are rough too,do they also benefit from this phenomenon? enter image description here

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