The airfoil bearings use process fluid as a lubricant, and most of the time, it is ambient air. These bearings are suitable for light load and high-speed operations. CSIR-NAL has successfully developed the radial air foil bearings and demonstrated up to 140 krpm with a 1 kg rotor. The simulation tool developed in-house can predict the pressure developed, in turn, the load carrying capacity of the foil bearing for its given configuration. This technology has been transferred to private industry and is being used in commercial applications.