A single - engined parasol monoplane , 32 R. 31s were built for the Belgian Air Force , the survivors of which , although obsolete , remained in service when Nazi Germany invaded Belgium in 1940 .
The Renard R. 31 was a Belgian reconnaissance aircraft of the 1930s .
A single - engined parasol monoplane , 32 R. 31s were built for the Belgian Air Force , the survivors of which , although obsolete , remained in service when Nazi Germany invaded Belgian in 1940 .
The Renard R. 31 was a Belgian reconnaissance aircraft of the 1930s .