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These tanks caused low pressure drag and the smallest possible speed loss with a relatively high tank capacity. Development work on this tank was conducted by the research establishment FGZ (Forschungsanstalt Graf Zeppelin) under engineer Isemann's management. Trials on Bf 109E-4 at the end 1940 were preformed.So if don't mind, would you please post more information about it here? Or others who know it now has more details send to me?? especailly Bf-109/E-4?