Dornier Do 335 Pfeil A (TopDrawings)

In 1937, Dornier obtained a patent for a plane with two engines in the fuselage, driving the pull and push propellers. The design was marked P.59, and its concepts were refined in 1939 in the P.59-05 variant, after which the design was put in a drawer. This type of plane was not needed at the time. Nevertheless, limited experimental work was carried out, the result of which was a small Goppingen Go-9 plane, with an aerodynamic system obtained from P.59, as well as three-support landing gear with a front wheel and an engine driving a push propeller through a long shaft.

The results of these experiments were used when designing the P.231 aircraft in several variants—also combining piston and jet propulsion. When in 1942 the RLM announced the requirements for a high-speed multipurpose aircraft, the equivalent of the British Mosquito, Dornier proposed the P.231 as a rather unusual answer. Despite the risks posed by the different P.231 concept, Dornier was commissioned to build several prototypes.