Following on from the most highly evolved Hawker Hurricane thread how about the most highly evolved biplane fighter type in a world war two timeframe?
Was the CR42, Avia B.534, Gladiator and I-153 as far as the type could go or could there have been a breed with powerful 1,000hp plus engines, retractable undercarriage, closed cockpits and heavy armament? How far could their performance be taken?