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A metallic airfoil of elliptical cross section has a mass of 50 kg, surface area of 12 m^2, and a specific heat of 0.50 kJ/kgK. The airfoil is subjected to air flow at 1 atm, 25 C, and 5 m/s along its 3-m-long side. The average temperature of the airfoil is observed to drop from 160 C to 150 C within 2 min of cooling. Assuming the surface temperature of the airfoil to be equal to its average temperature and using momentum-heat transfer analogy, determine the average friction coefficient of the airfoil surface.