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X-Plane 9.70+ P-47D-40 Thunderbolt 1.1. The Republic P-47 Thunderbolt was one of the largest and heaviest fighter aircraft in history to be powered by a single piston engine. It was heavily armed with eight .50-caliber machine guns, four per wing. The P-47D-40 introduced a dorsal fin extension in the form of a narrow triangle running from the vertical tailplane to the radio aerial. A total of 15,678 P47 Thunderbolts of all types were built. By Vasco Ribeiro.