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Demkin 1911 Biplane  Georgiy Konstantinovich Demkin’s [Георгий Константинович Демкин] second design, it is stated that he held a shed at the Gatchina airfield near St. Petersburg. Only a few “short, straight flights” were achieved with this sesquiplane fitted with a 3-cylinder 25 hp Anzani. The upper wing carried ailerons. Struts had oval cross section. Despite low engine power, short straight flights were performed during summer 1911.
 Engine: 1 x Anzani, 25hp
Wing span upper: 8.0 m / 26'3" Wing span lower: 4.6 m / 15'1" Wing area: 17.0 sq m (11.2 upper, 5.8 lower) Power loading: 13 kgs/hp
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