04/30/2009. The Siemens-Schuckertwerke (SSW) was awarded a contract in April 1918 for the development of a single-seat parasol monoplane fighter powered by the Sh IIIa rotary engine, three prototypes being ordered under the designation E IV, but this being changed to D VI in the following September. A unique feature of the D VI was the provision of a jettisonable main fuel tank beneath the fuselage.

No prototype was completed prior to the Armistice, but two emerged in 1919, flight trials being carried out between February and May of that year. During these one of the prototypes was destroyed and the other was allegedly sabotaged by SSW workers to prevent it falling into the hands of the Allied Control Commission.

Span: 30 ft 8.9 in (9.37 m)
Length: 21 ft 3.9 in (6.50 m)
Height: 8 ft 11.1 in (2.72 m)
Wing area: 134.12 sq.ft (12.46 sq.m)
Weight empty: 1,191 lb (540 kg)
MTOW: 1,565 lb (710 kg)
Max speed: 137 mph (220 kmh)
Climb: to 19,685 ft (6,000 m) 16 min
Range: 217 mls (350 km)