Republic P-47D Thunderbolt

The Republic P-47D Thunderbolt was the heaviest and most powerful single-engine piston fighter of World War II, and arguably the most effective ground-attack aircraft in the European theater. Nicknamed the "Jug" by its pilots, the massive Thunderbolt weighed nearly eight tons fully loaded and carried an armament of eight .50-caliber machine guns with an extraordinary ammunition supply. Its air-cooled radial engine and rugged construction made it legendary for absorbing battle damage that would have destroyed lesser aircraft.

The P-47 was the mount of some of America's highest-scoring aces, including Francis "Gabby" Gabreski and Robert S. Johnson. In the escort fighter role it initially lacked the range of the P-51 Mustang, but with external drop tanks it proved a formidable high-altitude dogfighter. Where the Thunderbolt truly excelled, however, was in the fighter-bomber mission. IX Tactical Air Command P-47 groups devastated German armor, transport, and supply lines across France, the Low Countries, and into the Reich itself.

With 15,636 built, the P-47 was produced in greater numbers than any other American fighter of the war. It served with air forces around the world, from the jungles of the Pacific to the steppes of the Eastern Front, and its combat record of a 4.6-to-1 kill ratio speaks to its effectiveness as a weapon of war.

The P-47 Thunderbolt traced its lineage to Alexander Kartveli, Republic Aviation's chief designer. Kartveli initially designed the lighter XP-47 and XP-47A around the Allison V-1710 inline engine, but these underpowered concepts were rejected by the Army Air Corps. The breakthrough came with the availability of the massive Pratt & Whitney R-2800 Double Wasp radial engine producing over 2,000 horsepower, coupled with an exhaust-driven turbosupercharger mounted in the rear fuselage.

The XP-47B prototype first flew on May 6, 1941, and at 12,086 pounds was the heaviest single-engine fighter ever built at the time. The turbocharger ducting ran the entire length of the fuselage, contributing to the aircraft's bulk but providing exceptional high-altitude performance. Early production P-47Bs and Cs suffered from various teething problems including compressibility issues in high-speed dives, fabric-covered control surfaces that ballooned at speed, and a canopy that was difficult to jettison in emergencies.

The definitive P-47D model incorporated hundreds of improvements based on combat experience. The most visible change came with the P-47D-25 "bubbletop," which replaced the original "razorback" framed canopy with a clear-view teardrop canopy similar to the P-51D. Curtiss-Wright also manufactured the P-47G at their Buffalo plant. Late-model D variants featured a dorsal fin fillet to restore directional stability lost with the cut-down rear fuselage, paddle-blade propeller for improved climb, and water injection for emergency power.

The final wartime variant, the P-47M, was a sprint model capable of 473 mph, developed specifically to intercept V-1 flying bombs and Me 262 jets. The P-47N was a long-range variant with larger wings and increased fuel capacity, designed for the Pacific theater and B-29 escort missions.