He didn't claim anything, except that spaceflights are possible, he just worked and created the idea of manned space flight and theorethical basis for space exploration. He created a theory- the theoretical basis for space exploration. In his works, he decribed a spaceship and all its systems.
How he could created a theory without practice is beyond me. I'm sure he should had launch some small rockets and made any other needed experiments, but I can't find the link about this.
However I found a couple of links about him, his life and his works. If you wish:
I'm too lazy to continue my search.
And btw, this topic is about Kaliningrad, not about geniuos Russian scientist.
How he could created a theory without practice is beyond me. I'm sure he should had launch some small rockets and made any other needed experiments, but I can't find the link about this.
However I found a couple of links about him, his life and his works. If you wish:
I'm too lazy to continue my search.

And btw, this topic is about Kaliningrad, not about geniuos Russian scientist.

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