AviatikAviatik D1 airplane model. Developed as a replacement for the Hansa Brandenburg D. I, the Aviatik D. I biplane was the first fighter built entirely in Austria. Designed by Julius von Berg, it was initially plagued by a number of serious problems. Though lightweight and highly maneuverable, the "Berg" had a nasty habit of shedding its wing fabric and the engine tended to overheat. Austro Hungarian ace Julius Arigi reported that weak construction