The last airplane actually built before the war was the creation of George Gramaticescu. It was a single-seat monoplane ( initially it was supposed to be a biplane, but due to unknown reasons it was completed as a monoplane ) powered by an 80 HP, air-cooled, radial Anzani engine. Gramaticescu didn't live to see his creation taking off, as he died in France in 1913, but his mother hired a group of French engineers and pilots who finished the plane according to his sketches by the spring of 1914.On the 30th of April 1914, the aircraft flew for 26 minutes and 30 seconds, demonstrating its qualities in front of two French specialists.
Edit: BUGGER!