Euler D.I
 The Euler D.I was a German single-seat fighter based on the French Nieuport 11. After seeing the success of the French Nieuport 11 at the front German designer August Euler set about to create a German aircraft based on the Nieuport design. The Euler D.I first flew in late 1916. It was powered by an 80 hp engine with the Euler patented machine gun on the front.