Designed as an unequal span and chord wing biplane, it was the creation of Arado's chief engineer, Walter Rethel who saw the first prototype of his creation flying at Warnemünde in 1934. It was of mixed construction with wooden plywood and fabric covered wings.
When the Arado Ar.68e was built, it was the production prototype for the Arado Ar.68E and was powered by the 610hp Junkers Jumo 210Da engine, but given the lack of available engines of that type led the company to create an interim version powered by a 670hp BMW VI engine.
The F variant was relatively rare, of the 511 Ar.68 built only 147 belonged to that variant and the production of this variant ceased in the spring of 1937.
Sources:
1. https://en.wikipedia.org/wiki/Arado_Ar_68
2. Salamander Books - The Complete Book of Fighters
3. http://histaviation.com/ar_68.html
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