Today, many amateur experiments in the field have been conducted using Tesla turbines which use compressed air, steam as its power source (the steam being generated with heat from fuel combustion, from a vehicle's turbocharger or from solar radiation). The issue of the warping of the discs has been partially solved using new materials such as carbon fiber. For example, both PNGinc and International Turbine And Power, LLC[7] use carbon fiber discs in their Tesla turbine designs.