The Dornier Rs.III was a large four-engined monoplane flying boat designed by Claudius Dornier and built during 1917 on the German side of Lake Constance at the Zeppelin-Lindau works. High-wing monoplane of all-metal design with fabric covering of the wing and empennage.
The intrinsically stable hull was a monocoque design made of duraluminium with traverse and longitudinal steps. The hull housed the gun station, the flight deck for two pilots, the engineer's station and the fuel system.  The four Maybach engines were arranged in tandem in two nacelles and installed between the hull and the wing. The tail boom was mounted on the wing and had a box-type horizontal tail assembly with split elevator without compensating surfaces; the rudders and tail fins were divided into halves by the fuselage.
First flight took place on November 4, 1917. On 19 February 1918, a 7-hour non stop flight was made from Friedrichshafen to Norderney for further testing by the Seaplane Test Command Warnemünde.

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