F-47D / F-51D
Planes USA B-17G
The Boeing B-17G Flying Fortress was the first American all-metal heavy bomber. The plane was designed in 1934 in response to a design competition for a coastal anti-ship bomber. A year later the Boeing-299 prototype was built, equipped with four 750-HP Pratt & Whitney engines. It was first flown on June 28 of that year. Subsequent variants used the 1,200 HP Wright Cyclone engines. Boeing factories began mass producing B-17 Flying Fortresses for the US Army Air Corps exactly 12 months later. Throughout the production run, Boeing produced 6,981 B-17s of various variants and an additional 5,745 were built by Lockheed and Douglas giving a total of 12,726 aircraft.