[Dénes Bernád]

I made a comparison chart of fighter aircraft that had their maiden flights between 1929-1931:

Aircraft type Country First flight Max. Engine Power (HP) Top Ground Speed (km/h) Top Speed at 4000-5000 m (km/h) Total weight
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I.A.R. CV-11 Rumania 16.12.1930 600 315 312 1510
Blériot-Spad 91-7 France 23.12.1931 500 295 320 1458
Polikarpov I-5 USSR 20.04.1930 480 278 1355
Polikarpov I-6 USSR 30.03.1930 420 280 1280
Arado Ar 64 Germany Spring 1930 530 250 1670
Heinkel HD 43 Germany Spring 1929 750 322 1630
Curtiss P-6E USA 2.12.1931 600 311 290 1558
Bristol Bulldog III UK 17.09.1931 560 335 1814
Hawker F.20/27 UK 05.1930 520 325 1429
Hawker Fury I UK 03.1929 480 333 1583
Hawker Nimrod I UK 14.10.1931 477 315 1841
Dewoitine D.27 III France 04.1929 500 298 280 1415
Fokker D.XVI Netherlands 07.1929 460 330 1400

[Most of the data taken from William Green and Gordon Swanborough, The Complete Book of Fighters, Smithmark, New York, USA, 1994]

Questions:
1, did I miss any important aircraft type (including prototypes)?
2, what I noticed is that only the Rumanian prototype was low-wing monoplane. Were there any other(s) I missed?
3, I ranked top speed as the most important characteristic of a fighter (at that time). Is this assumption correct?

Thanks for your inputs.