The Kharkov KhAI-1 (ХАИ-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.
designer
National Aerospace University – Kharkiv Aviation Institute
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