Best of the pre-war rest: Czechoslovakians, Poles, Romanians or Yugoslavs?

[Admiral Beez]

These four Central/Eastern European fighters first fly in 1938/39: Avia B-135, PZL.50 Jastrząb, IAR 80, Rogožarski IK-3. Which is the best?

Avia B-135 - Wikipedia

en.wikipedia.org

PZL.50 Jastrząb - Wikipedia

en.wikipedia.org

IAR 80 - Wikipedia

en.wikipedia.org

Rogožarski IK-3 - Wikipedia

en.wikipedia.org

As an aside, is the second aircraft below a dual seat IK-3?

If we want to include the Hungarians, there's the MÁVAG Héja that first flies in 1940.

 

[Zmauky]

By the oil cooler, and the horizontal tail, and the fabric outer part of the fuselage, definitely a Yak, I would say a local conversion of the Yak-9.
Admittedly, the rest of the planes in the picture also look like Yaks, but they are first version of the post-war S-49A. The plane that is about to take off is also a two-seater Yak-9

 

[Wurger]

Actually not Rogožarski IK-3 but these are the Ikarus S-49A as stated above , the mix of the American, Russian and Spanish parts. And indeed, the two-seater is the UJak-9. During 1953, the "Soko" factory from Mostar undertook the task of converting a certain number of Jak-9 single-seat fighter planes into a two-seat UJak-9 variant intended for flight training. I would say the training kite is quite similar to the Yak9V. Just the radio mast is attached at the different location.

the pic source: the net.