ill post some data on this one:
Rogozarski IK-3 (in fact IK-Z) was the first yugoslav modern fighter. 12 where built and they were pretty successful in their short combat career in 1941, claiming 11 victories before surviving ac were destroyed to prevent germans from getting them.
Specs:
Engine: Hispano Suiza 12 cil. 980 HP.
Max speed: 527 km/h
Climb to 5K meters: 7 min.
Weapons: 1 20mm cannon firing through the spinner
2 cowling mounted 7,92mm MGs