Dornier Do P

The Dornier Do P was a four-engine heavy bomber in the 1930s. It was built as part of Germany's secret rearmament programme, in violation of the Treaty of Versailles.

 The Do P was a monoplane constructed mainly of metal, but covered in fabric in some places. The aircraft was powered by four Siemens Jupiter VI nine-cylinder engines, each with 530 horsepower. The aircraft had a crew of six. Source: Wikipedia