1. The sum of friction drag and pressure ( form ) drag is called viscous drag. 2. In such situations, the airfoil is stalled and has higher pressure drag than friction drag . 3. In lighter air, it will cause friction drag . 4. This effect might also be used to reduce skin friction drag on aircraft wings by 40 %. 5. The total of the skin-friction drag and the viscosity-related pressure drag is usually called the profile drag. 6. This suggests that the total parasitic drag observed in turbulent flow is minimally impacted by skin friction drag . 7. Over most of the surface of most airfoils, the boundary layer is naturally turbulent, which increases skin-friction drag . 8. The air's viscosity resists the shearing, giving rise to a shear stress at the airfoil's surface called skin-friction drag . 9. Wave drag is one of the forms of drag created by swimmers, the others being pressure drag and friction drag . 10. The friction drag force, which is a tangential force on the aircraft surface, depends substantially on boundary layer configuration and viscosity.
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