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The Siemens-Schuckert Werke S.S.W. DDr II was the designation given to a proposed version of the unusual DDr I triplane that would have been powered by the Siemens-Halske Sh III engine.
The DDr I was a single seat triplane fighter that was powered by two Siemens-Halske Sh I engines. The two engines were carried on opposite ends of an egg shaped nacelle, with one acting as a pusher and one as a tractor.
The DDr II was to have used two Siemens-Halske Sh III engines, a more powerful development of the Sh I. Both were unusual rotary engines in which the crankshaft and cylinders rotated in opposite directions.
The DDr I was approved in June 1917, and made its maiden flight in November of the same year. Unfortunately the aircraft crashed on its maiden flight, and enough problems were seen to make it clear that the design was flawed. Work on the DDr II was cancelled and none were built.