It was a low-wing monoplane with an elliptical wing. Fuselage was made out of steel tube and the wings were made entirely out of wood. It had also a fixed landing gear, hoping that it would improve the speed, but in reality it was just an improvised solution because the mechanism for retracting the undercarriage wasn't yet available.
The first prototype, labelled B-35/1 showed good flying characteristics and was powered by an Hispano-Suiza 12Ydrs piston engine. The engine was changed shortly after to a 12Ycrs in order to refit the nose to instal a cannon there to fire through the propeller hub. The testing of the first prototype ended on 22nd November 1938 when the prototype crashed killing it's test pilot, Arnost Kavalec.
A second prototype, B-35/2 was already almost completed and featured redesigned ailerons and flaps. It flew for the first time on 30th December 1938 and it was tested on February 1939. It's known that a pre-production series order was placed, but the German occupation of Czechoslovakia in March 1939 stopped it.
Sources:
1. https://en.wikipedia.org/wiki/Avia_B.35
2. Salamander Books - The Complete Book of Fighters
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