Aircraft: Through World War I

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Coanda 1911 Monoplane prop Coandă 1911 Monoplane - Romanian Henri Coandă’s 1911 aircraft utilized wing warping and two 70 hp (52 kW) Gnome rotary engines coupled to a single propeller. It was one of the first twin-engine aircraft to fly.
Deperdussin-de Feure store rear Deperdussin-de Feure Model 2 - The Deperdussin-de Feure Model 2 was designed by Georges de Feure and built in France in 1909. The unique aircraft featured a canard design, contra-rotating propellers, and movable wings to alter the center of pressure.
Papin-Rouilly Gyroptere (Gyropter) - The French Papin-Rouilly Gyroptere was an early attempt at vertical flight. However, its design was deficient, and its unique power and control systems proved too advanced for 1915.
PKZ 2 engines 3 Petróczy-Kármán-Žurovec PKZ 2 Helicopter - Stephan Petróczy von Petrócz, Theodor von Kármán, and Wilhelm Žurovec combined their abilities to create a tethered helicopter that used three La Rhône rotary engines to power contra-rotating rotor blades.
Rumpler Loutzkoy-Taube front ground Rumpler-Loutzkoy-Taube Aircraft - Boris Loutzkoy’s power system was the first to employ coaxial propellers that rotated in the same direction. Installed in a Rumpler-Loutzkoy-Taube aircraft in 1912, the system was not a success.