The Germans did pour a lot of time/effort into Vimana Shastras and for that matter all things Vedic - because they fell into the delusion that Germans were the Aryan ancestors & as such laid ownership on everything Vedic!The USA learned to build the roads from the German Autobahns. They also learned sophisticated rocket manufacturing technology from the German engineers, scientists, and others after the WW2 German defeat. The Germans pioneered many technologies from? Anybody's guess. Did the historic Indian literature provide them guidance?
That said, Germans (&Europeans in general) did boost their scientific & industrial capabilities immensely during at industrial revolution (enabled by the the business prospect of free raw materials from their colonies & not to mention the captive markets in the colonies!).
India did exceedingly well in the science & engineering space couple of thousands of years ago....but in the recent centuries lagged behind drastically due to Mughals/British suppression AND the caste system! (remember that most inventions are made by people toiling in those respective fields....Indian system that denied education to the working class suffered immensely where engineering innovations were concerned).
For what it matters, India did bring back some German engineers that helped build HF-Marut!!!
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