10/31/2009. By mid-1916, the RFC in France possessed a small number of Nieuport two-seaters in which the 110 hp Le Rhône engine had replaced the 110 hp Clerget of the standard Nieuport 12. This version of the two-seat fighter was apparently built in small numbers only for the RFC with the SFA (Service des Fabrications de l'Aviation, Aircraft Manufacturing Services) designation Nieuport 20.

By early August 1916, 30 had been allotted to the RFC by the French authorities, the first two production aircraft being delivered on 15 September 1916. Anxiety to secure as many Nieuport single-seaters as possible led to a reduction in Nieuport 20 deliveries, only 21 being supplied to the RFC, with which the type saw limited operational use.

Span: 29 ft 6 in (9.00 m)
Length: 22ft 11.5 in (7.00 m)
Height: 8 ft 10.5 in (2.70 m)
Wing area: 236.8 sq.ft (22.00 sq.m)
Weight empty: 999 lb (453 kg)
Loaded weight: 1,6581b (752 kg)
Max speed: 98 mph (157 kmh) at sea level
Climb: to 6,560 ft (2,000 m) 12.1 min