In the beginning of 30s 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 17 designed by a German Dornier Flugzeugwerke 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.
In 1939-1940 it were produced about 500 Do 17Z-1 and Do 17Z-2 bombers. They took part in all 1939-1941 Luftwaffe operations – in Polish and French companies, in the Battle of Britain, and also in Balkans and in the Eastern Front.