Bf109K4 con esquema que imita a los Emil enviados por Alemania a Japón para sus pruebas.
The Bf 109E-7 first fought on the front lines in August of 1940. The E-7's biggest advantage over earlier variants was that it could carry drop tanks and bombs. In 1941, the Imperial Japanese Army Air Force purchased a fleet of five Bf 109E-7s (without armament) to be used for flight testing. The IJAAF's knowledge of the Bf 109E-7's liquid-cooled, inverted V-12 engine resulted in the Kawasaki Ki-61 Hien.