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 He 111 designed by a German Heinkel Flugzeugwerke AG company.
Since the December of 1942 it were produced He 111H-16 planes with liquid-cooled Jumo 211F-2 engines of increased power, with VS 11 wooden wider horde propellers and more powerful armament. This variant could carry up to 3000 kg bombs internally and externally.
The improved standardized modification Heinkel 111H-20 was produced in 1943-1944.