Abstract: A radial airfoil is an airfoil having a tip profile and a hub profile of an airfoil that were set apart at different angles of attack and joined by lofted top and bottom surfaces. The top surface is usually a convex surface, whereas the bottom surface is a slightly convex to substantially straight flat surface. The lift disc is a device including multiple radial airfoils that generate additional lift from the spent air from a VTOL (Vertical Take-off and Landing) machine, like a drone or helicopter. The lift disc can be used in several ways to assist the VTOL machines to generate lift. It can be used in a static mode where the lift disc is a non-moving element of the VTOL system. In a dynamic mode, the lift disc replaces the propeller and acts as a propeller to generate lift.