In this article we are introducing the dual Nature of Vaimaanik/aeronautical technology, the foundations of Drishya and Adrishya (Visible and Invisible). This technology involved considerations of (a) Structural materials and alloys used e.g., Rohinee, Tamogarbha etc. (b) Propulsion systems and mechanical components (which may or may not vary in the two types of Vimaan) (c) use of required optical devices: mirrors, lenses, and energy reflectors, and (d) Navigation tools and visual interfaces for decision making in the apt time.