In 1933, after the purchase by the Soviet Union license on 760 HP engine “Islamo-Suiza” 12ybrs. N. N Polikarpov again returned to the idea of creating a fighter with a liquid-cooled engine. The planned armament of two synchronised ShKAS machine guns and two promising guns ShVAK (nonsynchronous) caliber 20 mm. To achieve high speed, the fuselage is compressed to the limit, causing the cockpit was very cramped. Flight tests of the first instance And-17 began in the fall of 1934, but due to the identified deficiencies was short-lived.
The second copy of the plane with a machine gun and the M-100 brought to the airfield in 1935 it V. P. Chkalov had reached a speed of 500 km/h. the aircraft Later modified. In the collapse of the block of cylinders of the engine placed the gun ShVAK. maintaining synchronous Scasy Actually-17 turned into a flying laboratory, which worked out motor gun, which became the basis for the creation of MP-20, widely used on Soviet fighters during the great Patriotic war.
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