In the beginning of 1936 Kurt Tank has started development of the project of a twin-engined heavy fighter with engines DB-600; it was supposed, that speed of the machine will reach 560 km/h. Two prototypes equipped with 680-strong engines " Jumo-210Da ", flown in summer, 1937. They were followed by 4 more prototypes, armed two 7,92-mm machine guns and two 20-mm cannons. Besides on the sixth machine there were two engines DB-600A. Last construction of three pre-series Fw-187A-0 with reinforced armament.