The Kharkiv KhAI-1 (ХАІ-1) was an airliner produced in the Soviet Union in the early 1930s, unusual in that it was designed (and the prototype built) by students. An exceptionally clean design, the KhAI-1 was the first European passenger transport aircraft to feature retractable undercarriage, and boasted a top speed better than the fighter aircraft in service at the time.
The Kharkiv KhAI-1 (ХАІ-1) was an airliner produced in the Soviet Union in the early 1930s, unusual in that it was designed (and the prototype built) by students. An exceptionally clean design, the KhAI-1 was the first European passenger transport aircraft to feature retractable undercarriage, and boasted a top speed better than the fighter aircraft in service at the time.
Source: Wikipedia "Kharkiv KhAI-1" · CC BY-SA 4.0
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