Most Fw 190s were the "A" series, powered by a BMW radial engine. Late in 1943, however, the more capable "D" series appeared in action against U.S. bombers, powered by the more powerful Jumo 213 inline, liquid-cooled engine. Because the larger engine lengthened its nose, a 20-inch section had to be added to the Fw 190D-9's fuselage just forward of the tail. During its lifetime, more than 20,000 Fw 190s of all types were built.