The Siemens-Schuckert D.III was a German single-seat fighter built by Siemens-Schuckert Werke. The D.III was an equal-span sesquiplane powered by a 160 horsepower Siemens-Halske Sh.III bi-rotary engine.
Approximately 41 D.IIIs were delivered to frontline units between April and May 1918. Most aircraft were supplied to Jagdgeschwader II, whose pilots were enthusiastic about the new aircraft's handling and rate of climb. After only seven to 10 hours of service, however, the Sh.III engines started showing serious problems with overheating and piston seizure.
In late May 1918, Jagdgeschwader II replaced its D.IIIs with the older Fokker Dr.I. The remaining D.III aircraft were returned to the Siemens-Schuckert factory, where they were retrofitted with new Sh.IIIa engines, an enlarged rudder, and cutaway cowlings that provided improved airflow. A further 30 new production D.IIIs incorporated these modifications. Total production amounted to 80 aircraft.
In July 1918, the D.III returned to active service as an interceptor with home defense squadrons. By this time, the D.III had been replaced in production by the Siemens-Schuckert D.IV.
Source: Wikipedia, "Siemens-Schuckert D.III", available under the CC-BY-SA License.
As Described In
Red Baron: The SSW DIII is considered one of the best balanced, most capable fighters of the war. It served in limited numbers in late 1918.