Mercedes D.III was a development of earlier Daimler in-line
four engines. In fact, the "D" designation was for
Daimler. The in-line six became almost standard for Central
Power aircraft engines the First World War.
By war's end, the D.III was producing 185hp with
thousands having been built.
The D.III was also the first to successfully use a
steel cylinder with welded water jackets (Bill Gunston, Aero
|Six cylinder, in-line piston engine|
|Bore/Stroke: 140 x 160mm|
|Displacement: 902 cubic inches (14.8 liters)|