In 7000 BC, Rishi Bhardwaj's Vaimanika Shastra detailed the descriptions of several aeroplanes. He based them on changes in the ecosystem (winter, summer, etc.). In his texts we find different types of Vimanas- Mantrik, Tantrik, Kritika, etc. For example, Sundar Viman relied on solar energy, gas engines, furnace pipes. Shakun Viman used special metal which made it heat resistant. In 2017, an American Aeronautical Engineer, Travis Taylor, technically proved the sage's designs. He said the designs are perfectly aerodynamic. So did airplanes rule the skies thousands of years ago?   Narrated by Purab Written by Mihir Joshi Audio Design by Aayush Mehra Creative Direction by Dhruv Lau For Feedback and suggestions write to us - podcast@redfm.in or DM on Instagram - @redfmpodcastsSee omnystudio.com/listener for privacy information.