Aircraft Engines: Through World War I

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Antoinette VII with 100hp V-16 engine paris 1909 Antoinette (Levavasseur) Aircraft Engines - Léon Levavasseur’s V-8 and V-16 Antoinette aircraft engines powered the aircraft used by many early pioneer aviators in Europe.
Paradox side Deissner ‘Paradox’ Rotary Aircraft Engine - Designed by Charles Deissner of England, the Paradox rotary engine was an attempt to provide an improved power plant for early aviators.
Duesenberg Aircraft Engines: A Technical Description - Authored by William Pearce, Duesenberg Aircraft Engines: A Technical Description describes the aircraft engines from this nearly forgotten chapter in Duesenberg and aviation history.
Dutheil Chalmers Eole props rear Dutheil-Chalmers Éole Opposed-Piston Aircraft Engine - The Dutheil-Chalmers Éole was a line of unique, horizontal, opposed-piston engines. Built around 1910, the engines were intended for use in airships, but they were not successful.
Lancia V-12 aircraft engine side Lancia V-12 Aircraft Engine - In 1916, Italian engineer Vincenzo Lancia built a V-12 aircraft engine that was installed in Caproni Ca 37 and Ca 38 aircraft. Lancia designed other V-12s for automotive use, but none of these engines entered production.
REP 7-cylinder R.E.P. Fan (Semi-Radial) Aircraft Engines - Starting in 1906, French early aviation pioneer Robert Esnault-Pelterie designed a series of fan (or semi-radial) aircraft engines, the most popular of which had seven cylinders and displaced 230 cu in (3.8 L).
Roberts 6-X engine side Roberts Motor Company Aircraft Engines - During the 1910s, the Roberts Motor Company made a series of four- and six-cylinder aircraft engines. The two-stroke engines had open exhaust ports, a rotary intake valve, and exposed gearing.
SPA-Faccioli N3 rear SPA-Faccioli Opposed-Piston Aircraft Engines - In the late 1910s, Italian engineer Aristide Faccioli worked with SPA to create a line of unique, opposed-piston aircraft engines. While the SPA-Faccioli engines did power some aircraft, none entered production.
tips-1917-18-cylinder-rotary-engine Tips Aero Motor Rotary Aircraft Engines - Designed by Maurice Tips, who was originally from Belgium, the Tips aircraft engines were a unique series of rotary engines with rotary valves.