Avia BH-7

The Avia BH-7 was a Czechoslovak prototype fighter built in 1923. It was, more precisely a parasol wing-monoplane developed in parallel to the BH-6, which shared the fuselage and tail design.
Just like the BH-6, it crashed various times when tested, which caused it's abandonment as a fighter.
However, Avia decided to use the design as the basis for a racing airplane by shortening the wingspan 1.4m and fairing it directly into the fuselage dispensing it with cabane struts.
Both racing version and fighter version were renamed as BH-7A, the fighter and BH-7B, the racing variant.
When the racing airplane proved to not be more successful than the fighter, it was abandoned.

Sources:
1. https://en.wikipedia.org/wiki/Avia_BH-7
2. Salamander Books - The Complete Book of Fighters