Originally Posted by
dook
Maybe the Rublic R-7 Seagull.
You have it dook, My reference, Tschechslowakische Flugzeuge by Hans-Joachim Mau gives it as VPS Svazarmu R-7 Racek. however I note Secret Projects state
Mr. Zdenek Rublič was from Czech,and he born in 1902,became interesting in Avia from 1920s,then with Mraz after the
WWII with Sokol,and in 1961 he developed a R-7 Racek,which was a single seat low-wing aerobatic monoplane,powered by one 160 hp Walter Minor 6-III engine.