s purchased by the Ilmavoimat, the Fokker D.XXI had fixed landing gear and a relatively underpowered engine (1× Bristol Mercury VIII air-cooled, 9-cylinder, radial, 619 kW-830 hp) for interceptions, it lacked armour and the effectiveness of the weapons was questionable. The radios were limited in range in the beginning and the max level speed was only 285mph.