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Euler D.I / D.II
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 17 design. The Euler D.I single-seat fighter first flew in December 1916. It was powered by an 80 hp engine with the Euler patented machine gun on the front.
Two prototypes were recorded as being in service at the front in October 1916, and the German government ordered 50 in the same month. A further 50 were ordered in early 1917, but this order was largely transferred over to the D.I's successor, the Euler D.II. About 75 were built. The D.I saw very little combat service with the German Empire, being largely used as a fighter trainer for the remainder of the war and retired around 1920.
Euler D.II
The Euler D.II single-seat fighter successor to the Euler D.I was essentially a re-engined Euler D.I, the airframe being virtually unchanged and the power plant being a 100 hp Oberusel U I seven cylinder rotary.
Thirty D.II fighters were ordered by the German air force in March 1917, however due to slow production these were not delivered until December 1917. As a result, the D.II was relegated to the role of a trainer aircraft for the rest of the war and retired in 1918.
Euler D.I
Engine: 1 × Oberursel U.O, 60 kW (80 hp)
Wingspan: 8.10 m (26 ft 6⅞ in)
Length: 5.80 m (19 ft 0¼ in)
Height: 2.66 m (8 ft 8¾ in)
Wing area: 13.00 m² (139.93 ft²)
Empty weight: 380 kg (838 lb)
Loaded weight: 600 kg (1,323 lb)
Maximum speed: 140 km/h (87 mph)
Time to 2,000 m: 12.5 minutes
Crew: One
Armament: 1 x engine-mounted 7.92-mm machine gun
Euler D I
Engine: 80 or 100 h.p. Oberursel U O or U I rotary
Span: 8.1 m. (26 ft. 7 in.)
Length: 7.12 m. (23 ft. 4 3/8 in.)
Height: 2.66 m. (8 ft. 8 3/4 in.)
Empty weight: 380 kg. (836 lb.)
Loaded weight: 600 kg. (1,320 lb.).
Climb to 2,000 m: (6,560 ft.): 12.5 min.

Euler D.II
Engine: 1 × Oberursel U.I, 75 kW (100 hp)
Wingspan: 7.47 m (24 ft 6 in)
Length: 5.94m (19 ft 5⅞ in)
Height: 2.75 m (9 ft 0 in)
Empty weight: 380 kg (838 lb)
Loaded weight: 615 kg (1,356 lb)
Maximum speed: 145 km/h (90 mph)
Time to 2,000 m: 9.5 minutes
Endurance: 1.5 hours
Armament: 1 x engine-mounted 7.92mm machine gun
Crew: One

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