Anytime the topic of Indian vedic science comes up, there's always that one guy who mentions something about the 'Vyamanika Shastra', a Hindu book that told people how to make planes. Damn, we literally had a 'shastra' for planes - of course we were a science superpower. That is until you actually analyse the shastra and try to make a damn plane from it. We went through this detailed debunking of our high flying mythology by the fine folks at the Indian Institute of Science.
There is a ridiculously detailed number of Sanskrit passages and diagrams that look like something a scientist would understand. We've cited the Journal where we're getting this stuff from, so you can challenge them if you feel like it.
From the journal:"These, however, are too vague, scanty, and totally inadequate to date their (verses) content to the Vedic period. Further, we are afraid we may be attributing meaning to shlokas based on what we know today. The “Brihad Vimana Shastra†sources manuscripts from books at the Rajakiya Sanskrit Library, Baroda, in 1944.