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This was one of the first instances of a government admitting to be researching anti-gravity.
Source- Vymanika shastra on wikipedia.org
A study by aeronautical and mechanical engineering at Indian Institute of Science, Bangalore in 1974 concluded that the aircraft described in the text were "poor concoctions" and that the author showed a complete lack of understanding of aeronautics. The study also states "The Rukma Vimana was the only one which made sense. It had long vertical ducts with fans on the top to suck air from the top and send it down the ducts, generating a lift in the process."