The Dornier Do 13 was a German bomber from the Dornier works . The aircraft was developed in 1932/33 based on the Dornier Do 11 . Compared to this, changes were mainly made to the engines. For example, the Siemens “Jupiter” star motors in the Do 13 A were fitted with reduction gears, which increased the output from 550 hp to 600 hp. The Do 13 C received BMW VI V engines with gearboxes and an output of 750 hp. The Do 13 was developed into the Do 23 .
Dornier Foundation for Aviation and Space Travel (ed.): Dornier: Factory history and aircraft types . Delius Klasing, Bielefeld 2009, ISBN 978-3-7688-2610-5 , p.98 .