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Zenker Bremen I
Carl Zenker, of Bremen, Germany, designed this "steerable airship" Eight horizontal propellers provided vertical lift. Its construction from bamboo rods and cloth took from August 1873 till March 1900, and cost about 40,000 Marks. Herr Zenker stated proudly that the craft, "Requires no balloon to become airborne, and operates at a nominal 6hp". Weighing 660lb and driven by "fluid air and compressed air", a speed of 1km in 2mins (about 18.5mph) was estimated. Horizontal flight was to be achieved by means of twin propellers, and the craft was steered by a single rudder. One could own a Zenker contraption for a mere 10,000 Marks, from four to six months after receipt of the order.

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