Zeppelin LZ1, 1900: Theodor Kober designed the first rigid built on the classic principles advocated by Count Zeppelin. LZ 1 was the first truly successful experimental rigid airship. It was first flown from a floating hangar on Lake Constance, near Friedrichshafen in southern Germany on 2 July 1900. “LZ” stood for Luftschiff Zeppelin, or “Airship Zeppelin”. With a capacity of 11,300 cubic metres (399,000 cubic feet) of hydrogen gas contained in 16 separate cells within a 128m. (420ft.) long hull, LZ 1 was far larger than any previous airship. She was flown tentatively three times and demonstrated a speed of 7.8 metres per second (17.5 mph) on the power of two 14 hp Daimler petrol engines but proved to be almost uncontrollable.
Naval Airship No. 1 ‘Mayfly’ 1911: The British were the first after the Germans to attempt construction of a rigid airship. The ironically-named MAYFLY was closely modelled on the Zeppelin and was built for the Royal Navy by Vickers at Barrow-in-Furness. When it was moved from its shed in Cavendish Dock to conduct full trials on 24 September 1911, it broke in two because of being subject to strong winds before it could attempt its first flight. Although Mayfly never flew, its brief career provided valuable training and experimental data for British airship crews and designers