X-Plane 10 Republic P-47G Razorback v1. The Republic P-47 Thunderbolt was one of the largest and heaviest fighter aircraft in history to be powered by a single piston engine. The P47 was heavily armed with eight .50-caliber machine guns, four per wing. The Republic P47G Razorback 274742 "War Eagle" represented here (Curtiss built) was flown by Captain Julius Maxwell of the 84th Fighter Squadron (78th fighter Group) based at Duxford. By Philippe Gastebois.