Probably the most impressive German artillery tractor of WWI: the Dürkopp 100hp. The factory manual once was sold on Ebay and Jochen Vollert of Tankogad publishing kindly provided me with copies of the technical drawings and illustrations out of the document.
Long time I still had no idea, how the monstrous rear wheels were positioned within the frame. There were some modifications not only in relation to the frame (due to the wheel's bigger diameter) but also in relation to the transmission, as the chain sprocket has moved above the frame, and much more!
In the meantime I discovered by sheer coincidence some cruical documents, that show the frame modifications and also a photo of the gearbox too! And this is, what I am currently workin on...
