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No. 21 Demoiselle (1909)
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No. 20 Demoiselle – A modification of No. 19, considered to be the first practical ultralight aircraft. (1908)
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No. 9 Baladeuse – Built as the smallest airship that Santos-Dumont considered practical. As first constructed capacity was 220 m3 (7,800 cu ft): later enlarged slightly to 261 m3 (9,200 cu ft). (1903)
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No. 10 (airship) – Sometimes called the Omnibus, this was intended to carry twelve passengers as well as the pilot and a second crew member. 48 m (157 ft 6 in) long, 8.5 m (27 ft 11 in) diameter, 2,010 m3 (71,000 cu ft) capacity. The pilot and the 46 hp four-cylinder Clément water-cooled engine, occupied a triangular-section uncovered gondola suspended 2 m (6 ft 7 in) below the envelope, with a fabric covered propeller at either end: a second gondola suspended 10 m (32 ft 9 in) below this held the three baskets for the passengers and an assistant pilot. Made only test flights. (1903)
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No. 18 – Not an aircraft, but a propeller-driven "hydro-flotteur" powered by V-16 Antoinette engine driving a three-bladed propeller, and resting on an elongated central float stabilised by smaller floats either side. (1907)
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No. 4 (airship) – 39 m (128 ft) long, with a diameter of 5.1 m (17 ft) and a gas capacity of 420 m3 (15,000 cu ft). No. 4 differed considerably from the previous models, not only in the shape of the envelope, but in the arrangement of the keel, which now carried the motor, a 7 h.p. Buchet, and pilot, who sat on a bicycle saddle. A tractor propeller was mounted at front of the keel. A ballonet and rotary pump was fitted, and Santos Dumont, having acquired a hydrogen generating plant, returned to hydrogen as a lifting gas. (1900)
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