The Nieuport 12A.2 became the principle fighter-reconnaissance mark and these carried either the French Clerget 9Z or Le Rhone 9J series engines of 110 horsepower. The Nieuport 12bis C.2 followed and was outfitted with the more powerful Clerget 9B of 130 horsepower as well as some aerodynamic refinements. The British Beardmore-produced Model 12s evolved to feature numerous modifications to the French design to better suit British Air Service requirements though powerplants remained consistent. The Nieuport 20 was an RFC-only model fitted with the Le Rhone 9J of 110 horsepower - twenty-one examples being produced and its early forms based largely on the original French 12bis C.2 form.
In time, the Nieuport 12 was found to be sufficient as a trainer as well (its two-seat configuration benefitting this) and thusly the Nieuport 80E.2 and 81E.2 were produced to fulfill the requirement. The gun ring was deleted in this mark and power came from a Le Rhone 9C of 80 horsepower. The two designations differentiated the cockpit control schemes - the 80E.2 was a dual-control form (controls in both cockpits) and the 81.E2 featured the controls only in the rear cockpit.
Beyond these operational marks there lay limited production forms such as the "Nieuport 13" - a pair of prototypes with extended wing elements and different engine installations. "Sipowicz 1" was an experimental Polish variant with revised wing structure units. The Japanese operated as many as 57 locally-built Nieuport 80E.2 trainers under the "Army Type Ko 1 Trainer" designation - these manufactured by Mitsubishi - further reinforcing their batch of 40 81E.2s delivered from Nieuport.
Other operators included Argentina (navy), Belgium, Chile (single example only), Estonia (post-war), Greece (navy), Portugal, Romania, the Russian Empire/Soviet Union, Serbia, Thailand (as Siam, single example only), and the United States (the American Expeditionary Force - AEF).
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