Czechoslovak pioneer Ludvik Ocenasek already did rocket tests in Prague in the 1920s.

-But before, in 1908 he already made an engine of his own design, a rotary radial that gave 12 hp at 600 rpm and 50 hp maximum, which was installed in a peculiar way on his monoplane a couple of years later.

"The interesting Ocenasek rotary engine"

-The engine installation on board a Bleriot XI derivative was totally atypical.

“Airplane with the Ocenasek engine”

-Subsequently he devoted himself to experimentation with rockets, doing multiple tests.

"Solid-fuel rockets tested by Ocenasek"

-His notoriety was such that his relationships became at the level of Hermann Oberth, as we see in a photo taken in Prague.

-Well related, he maintained correspondence with the main countries that experienced this progress: Goddard, Valier, Oberth, etc.

“Oberth and Ocenasek”