In the beginning of З0s it was appeared in the world an idea of high-speed bomber that could outstrip contemporary fighters. One of the objectifications of this conception became the twin-engine bomber Do 17designed bу а German Dornier Flugz eugwerke company.
Since the beginning of 1939 it were produced Do 17Z planes with new “Waffenkopf ” type nose part and air-cooled Bramo 323 Fafnir engines.
ln 1939 -1940 it were produced about 500 Do 17Z-1 and Do 17Z-2 bombers. They took part in all 1939-1941 Luftwaffe operations. These aircraft were also transferred to Finland.