The exhaust system was the center engine layout which took the air from the nose of the aircraft. It was emitted a jet of liquid fuel with the air from the air intake through the engine placed in the center of the fuselage.
The first trial aircraft of F-84 succeeded in the maiden flight in Feb. 1946, then the second prototype established the new record max speed as an American aircraft, 978km/h in Sep. 1946. Then C and D types modified on the engine and fuselage, and E type modified on extending the fuselage and adding an extra fuel tank were produced after the first mass-produced type, B type as the military dispositions was produced in Nov. 1947. Finally G type which had the straight wing was produced in 1951. The features of G type were an air-refuel system, the nuclear weapon load system which could load up to 2 tons, Allison J35A-29 engine, a big fuel tank and the extra fuel tank placed on the end of its wings. Therefore the cruising range reached more than 3600km. In 1952, G type was introduced into Korean conflict and had a hard dog fight with the new and powerful jet, Mig.
However G type played an important role ground attacking because of its special features such as the long cruising range.