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.5905 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 Go9 plane with an aerodynamic system obtained from P.59 as well as threesupport landing gear with a front