The Grumman F6F Hellcat was a phenomenally successful fighter during WWII, so much so that it achieved a kill-to-loss ratio of 19:1 in the Pacific theater. Hellcats destroyed a total of 5,163 enemy aircraft, making it the most successful aircraft in naval history. This aircraft carrier-based fighter was introduced in 1943, replacing the F4F Wildcat. Powered by a 2000hp Pratt & Whitney R-2800 engine, it could achieve speeds of 610km/h. One special Hellcat variant was the F6F-5N, which was a night-fighter. To help perform its mission, the Hellcat was fitted with AN/APS-6 radar in addition to its four .50-caliber machine guns and two 20mm cannons. This radar system was mounted in a pod on the starboard wing, and it aided the pilot in detecting and attacking enemy aircraft during the hours of darkness.