Dornier Do Y

The Dornier Do Y was a German three-engine monoplane bomber of the early 1930s designed on commission from the Royal Yugoslav Air Force (RYAF). The Do Y was a shoulder-wing monoplane with an all-metal monocoque fuselage made of duralumin. The empennage structure was also made of duralumin, but was covered in fabric, as were all the control surfaces. source wikipedia