Polikarpov I-16

The Polikarpov I-16 (Russian: Поликарпов И-16) is a Soviet single-engine single-seat fighter aircraft. It is a low-wing cantilever monoplane fighter with retractable landing gear, and was the first such aircraft to attain operational squadron status. It "introduced a new vogue in fighter design". The I-16 was introduced in the mid-1930s and formed the backbone of the Soviet Air Force at the beginning of World War II. The diminutive fighter, nicknamed "Ishak" or "Ishachok" ("donkey" or "burro") by Soviet pilots, figured prominently in the Second Sino-Japanese War, the Battle of Khalkhin Gol, Winter War and the Spanish Civil War – where it was called the Rata ("rat") by the Nationalists or Mosca ("fly") by the Republicans. The Finns called the aircraft Siipiorava "(flying squirrel)".