I found this one of a kind model..
A single experimental aircraft based on the P-47D with lightened structure and special 2,800 hp (2088 kW) R-2800-57(C) with turbocharger housed inside a close-fitting cowling and cooled by a fan. The ventral intake for the CH-5 turbosupercharger was separated from the engine cowling and moved aft. The four-bladed propeller was fitted with a large conical-shaped spinner. The wing structure was lightened and the armament was reduced from eight to six 12.7 mm (0.50 in) machine guns. The contract was approved on 18 June 1943.
The XP-47J flew for the first time on 26 November 1943. On 4 August 1944, it attained a speed of 504 mph (811 km/h) in level fight, becoming the first propeller-driven fighter to exceed 500 mph (805 km/h). Briefly, it was proposed that the J model would be introduced into production, but the advent of the even more advanced XP-72 resulted in plans for the production of the P-47J being abandoned before any more could be completed. A plan calling for the installation of a R-2800-61 engine with ontrarotating propellers on the XP-47J never came to light.
