Designed and built by Nielsen & Winther A/S, a Copenhagen machine tool manufacturer, possibly with some assistance from the Swedish Thulin concern, the Type Aa single-seat fighter was first flown on 21 January 1917. Of wooden construction, the Type Aa was powered by a 90hp Thulin rotary engine (a copy of the Le Rhone) and was armed with a single 8mm Madsen machine gun mounted on the upper wing and firing above the propeller disc. Ground tests with synchronising equipment took place in 1918, reportedly using a Type Aa with the gun mounted on the side of the fuselage, but there is no evidence that air firing tests took place. Six Type Aa fighters were delivered to the Danish Army during 1917, but these were withdrawn from service in 1919 owing to the unreliability of their engines. Prototypes were completed of a two-seat reconnaissance version, the Type Ab, and a floatequipped version of the single-seater, the Type Ac.

3-View

A three-view drawing (1280 x 978)