The Arado SD.III was a biplane fighter prototype that was built in Germany during the very lates 1920s. The development was made in parallel with the SD.II and employed a similar airframe.
Unlike the SD.II which was powered by a geared engine, this one was powered by a 510hp Siemens und Halske-built Jupiter VI engine which featured a smaller-diameter and a two-bladed propeller. In order to adapt the engine to the fuselage, the shape of the forward fuselage was revised and shorter underacarriage with more rake was fitted. It was armed with two 7,92mm 08/15 machine guns, just like the SD.II.
It was evaluated in Staaken, Rechlin and Lipetsk and, despite it was judged unsuitable for mass production, it served as the basis in order to design and develop the following Arado Ar.64 and Ar.65.
Sources:
1. https://en.wikipedia.org/wiki/Arado_SD_III
2. Salamander Books - The Complete Book of Fighters.
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