Each and every of important Fokker’s airplanes had mostly one key innovation in its design. E.I-E.III monoplanes, of modest performance, had machine guns synchronisers allowing them to shoot through the rotating propeller. That ability made them the first real fighters. Dr.I Triplane’s wings were thick and short so they needed no rigging in order to avoid the drag caused by the rigging wires. Additionally, thick airfoil gave excellent climb. Fokker’s D.VII advantage over enemy airplanes...