Yes exactly, when i was in a aviation university i was heavily interested in experimental aircrafts, most of them where used/invented during ww2 by the nazis and the soviets, after ww2 nasa continued to research some stuff but nowadays its mostly dead as far as i know. I was mostly interested in aerospike engines for planes or rocket engines even for planes or some really ridiculous ideas like a pivot wing, which nasa successfully researched and has a potential to be very efficient, but everytime i brought those ideas up to my lecturers or even to other students they always said that it wouldnt be possible because its not profitable. Tbf i think that was the starting point of me getting radicalized, tbf to them it is unrealistic in todays world and it isnt possible right now because of capitalism, but at the time i would just get mad at them lol. It is very interesting tho, that whole world of aviation its so vast and its so diverse its crazy.