Company photo of the Arado SD IV (company-internal designation), the prototype of the Ar 64 fighter, likely taken in 1931. The aircraft lacks any kind of markings.
The SD IV had a length of 7.75 m and a span of 9.90 m. In contrast to Arado's previous fighter prototypes, the SD IV's 530 hp Siemens Jupiter VI engine was mounted slightly further to the rear in order to provide room for the gear that drove the Schwarz four-bladed wooden airscrew. The top speed attained by the SD IV was 250 km/h.
Arado began developing the SD IV/Ar 64 from 1930 onwards. This aircraft programme was part of the clandestine rearmament efforts of Germany and the associated intention to establish a new air force. (German Aviation 1919-1945 collection)
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