Republic P-47 Thunderbolt

The Fighter Built Around a Turbosupercharger

The Republic P-47 Thunderbolt is, by History of War’s reckoning, the largest and heaviest single piston-engined fighter ever produced. Almost everything odd about it follows from one decision: Alexander Kartveli built the aircraft around a General Electric turbosupercharger, and then had to find somewhere to put it.

The turbine would not fit near the engine, so it went into the rear fuselage, roughly halfway between the cockpit and the tail. Exhaust gases from the Pratt & Whitney R-2800 ran back through a pair of wastegate-equipped pipes along each side of the cockpit to spin it, and ducting carried compressed air forward again through an intercooler.

At full power those pipes glowed red at their forward ends and the turbine spun at 21,300 rpm. All of that plumbing is why the Thunderbolt’s belly is so deep, and why a fighter with a single seat ended up weighing nearly twice as much as a Supermarine Spitfire Mk V.

The payoff was altitude. The turbosupercharger kept the R-2800 making power far above the height where a mechanically supercharged engine falls off, which is what made the P-47 a serious high-altitude escort fighter rather than an overweight curiosity.

From XP-47B to First Combat

The design traces back to Kartveli’s work in the late 1930s on a successor to the Seversky P-35, one of the American fighter designs of the period. His AP-10 proposal drew United States Army Air Corps backing as the XP-47, and successive redesigns to keep pace with European fighters produced the far larger XP-47B.

The prototype was ordered in September 1940 and made its first flight on 6 May 1941 with Lowry P. Brabham at the controls. Production aircraft followed over the next year, and P-47Cs reached England at the end of 1942 for operations with the Eighth Air Force.

The 4th Fighter Group flew the type’s first combat mission on 10 March 1943. The National Museum of the United States Air Force dates the first sweep over Western Europe to April 1943.

The reception was not warm. Many 4th Fighter Group pilots had come from the British Eagle Squadrons and the slender Spitfire Mk V, and the Thunderbolt had about 5 feet more wingspan, a quarter more wing area, roughly four times the fuselage volume and nearly twice the weight.

One pilot said flying it was like flying a bathtub around the sky. Ace Don Blakeslee, referring to the aircraft’s celebrated diving ability, said it more sharply: “It ought to be able to dive. It certainly can’t climb.”

Razorback to Bubbletop: How the P-47D Changed Mid-War

The P-47D is the version that matters, with more than 12,500 built across more than twenty blocks at two factories. It is also two visibly different aircraft that share a designation.

Early P-47Ds carried the metal-framed “greenhouse” canopy behind a raised spine, the configuration collectors call the razorback. Rearward visibility was poor, which in a fighter is a survival problem rather than a comfort problem.

The P-47D-25-RE introduced the clear bubble canopy, borrowed in concept from the Hawker Typhoon, and cut the spine down behind it. The same block raised internal fuel from 305 to 370 US gallons, which is why the bubbletop blocks escort noticeably further than the razorbacks.

Climb was the other fix. The P-47D-22 brought a wider, longer-bladed Hamilton Standard propeller, and the arrival of paddle-blade props in early 1944 improved low-altitude climb enough to surprise German pilots who had learned to escape a Thunderbolt by climbing away from it.

The last D block, the P-47D-40, added a small dorsal fin ahead of the vertical stabilizer to cure a tail flutter problem, along with tail warning radar. The four-bladed Curtiss Electric C542S propeller on these aircraft measures 13 feet (3.96 m) across.

The R-2800 Double Wasp

The Thunderbolt’s engine is the same Pratt & Whitney R-2800 Double Wasp that powered the Grumman F6F Hellcat and the Vought F4U Corsair, an 18-cylinder air-cooled twin-row radial. In the P-47D it is the R-2800-59.

The loss of an earlier prototype to an engine fire had ended Kartveli’s experiments with tight cowlings, so the engine sits inside a broad cowl that opens at the front in a horse-collar ellipse. That single opening feeds the engine, the left and right oil coolers and the turbosupercharger intercooler.

Air cooling is a large part of why the P-47 earned its reputation for absorbing damage. A liquid-cooled fighter can be brought down by a single coolant leak, and a radial simply has no coolant to lose.

Luftwaffe ace Heinz Bär said the P-47 “could absorb an astounding amount of lead and had to be handled very carefully.”

What the Thunderbolt’s Numbers Actually Mean

The full specification table for the aircraft is on this page. Several of those figures are quoted against each other in different places, so they are worth unpacking.

The power figure is war emergency power with water injection, which Joe Baugher’s reference and the Planes of Fame Air Museum both give as 2,535 hp for the R-2800-59. That is not the engine’s normal output: its takeoff and military rating is 2,000 hp, and the USAF museum fact sheet quotes 2,430 hp. A wartime P-47 pilot had the top figure available for a few minutes at a time, not for a whole sortie.

Top speed moves with altitude and with whether water injection is running. The panel’s 433 mph figure is the one the USAF museum and the Hill Aerospace Museum publish. Wikipedia’s P-47D-40 block records 444 mph at 23,200 feet with water injection and 430 mph at 25,400 feet without it, while Baugher gives 429 mph at 30,000 feet for the D-25.

Range is the figure most often misread. The 900 nautical miles in the panel is roughly the 1,030 miles the museum sources publish on internal fuel, but a P-47D carrying a full 595 US gallons including external tanks could reach about 1,800 miles at 10,000 feet. Escort radius, the number that decided which bombers the type could protect, is far shorter than either.

Service ceiling carries a similar spread: 42,000 feet in the Wikipedia D-40 block and the USAF museum fact sheet, 40,000 feet in Baugher’s D-25 entry. Different blocks, different weights and different measurement conditions all move it.

Eight Guns and 2,500 Pounds of Bombs

The P-47’s standard armament is eight .50 in (12.7 mm) M2 Browning machine guns, four in each wing, with 425 rounds per gun for 3,400 rounds in total. That is a heavier battery than almost any contemporary single-engine fighter carried.

Ground-attack load grew through the war. Early P-47Ds carried a 500 lb (227 kg) bomb on the belly, mid-production aircraft could take 1,000 lb (454 kg) bombs and 4.5 in M8 rockets under the wings, and from the last D blocks in 1944 the aircraft carried 5 in High Velocity Aircraft Rockets.

The published maximum is 2,500 lb (1,134 kg) of bombs, or ten 5 in rockets. Royal Air Force Thunderbolts in Burma flew with three 500 lb bombs or, in some cases, British 60 lb RP-3 rocket projectiles.

Combat Record

The Thunderbolt finished the war with an aerial kill ratio of 4.6 to 1 across more than 746,000 sorties of all types, at a cost of 3,499 P-47s lost to all causes in combat.

Its larger contribution was against targets on the ground. Between D-Day and VE Day, P-47 pilots claimed roughly 86,000 railroad cars, 9,000 locomotives, 6,000 armored fighting vehicles and 68,000 trucks destroyed.

Those are claims rather than audited counts, but one action was checked on the ground. During Operation Cobra on 29 July 1944, the 405th Fighter Group attacked a German column trapped near Roncey in France from 3:10pm to 9:40pm, and ground investigators afterward found 66 tanks, 204 vehicles and 11 guns destroyed.

The 56th Fighter Group was the only Eighth Air Force unit that kept the P-47 by preference rather than converting to the P-51 Mustang. It claimed 677 and a half aerial victories and 311 ground kills for 128 aircraft lost.

Three of its pilots became household names among the war’s leading fighter pilots: Francis “Gabby” Gabreski with 28 victories, Robert S. Johnson with 27, and group commander Hubert Zemke with 17.75, three of them scored in a P-38. Two P-47 pilots, Neel E. Kearby and Raymond L. Knight, received the Medal of Honor.

Variants Beyond the D

Production began with a single XP-47B prototype, 171 P-47Bs and 602 P-47Cs, all built at Republic’s Farmingdale plant on Long Island. Curtiss-Wright built 354 P-47Gs at Buffalo, essentially razorback P-47Ds from a second source.

Two prototypes chased more speed. The XP-47H fitted a 16-cylinder Chrysler engine and was canceled, while the single XP-47J reached 504 mph on 4 August 1944, a figure often cited as the first time a piston-engined fighter passed 500 mph.

The P-47M was a production answer to the V-1 flying bomb and to German jets. Just 130 were built, with an uprated 2,800 hp engine and a 473 mph top speed.

The P-47N was the Pacific aircraft. It received a new, longer-span wet wing carrying fuel inside it, which gave the range that very long overwater escort legs demanded, and roughly 1,800 were built before the last P-47 rolled out in December 1945.

With the end of the war, orders for 5,934 more Thunderbolts were canceled. Total production came to 15,636 aircraft, a figure some references put slightly higher at 15,683, and either way more than any other American fighter of the war.

Allied and Postwar Service

The Royal Air Force received 240 razorback P-47Ds as the Thunderbolt Mk I and 590 bubbletop D-25s as the Thunderbolt Mk II. With no need for another high-altitude fighter, the RAF used them for ground attack in Burma with 16 South East Asia Command squadrons, and kept them until October 1946.

Soviet, Free French, Brazilian, Mexican and Chinese units also flew the type. The Italian Air Force took 174 P-47D-25s between 1947 and 1950, where the aircraft mattered less as a fighter than as a heavy transition trainer ahead of the F-84 Thunderjet.

The USAAF redesignated the aircraft F-47 in 1947. It served with the active-duty United States Air Force until 1949 and with the Air National Guard until 1953, and was not deployed to Korea, a decision later second-guessed when Mustangs proved vulnerable to ground fire.

Many surplus airframes went to South American air forces under Military Assistance Programs, where they stayed in front-line service for another 15 years. The last operator was the Peruvian Air Force, which retired its Thunderbolts in 1966.

P-47 Thunderbolt vs P-51 Mustang

The comparison is unavoidable and mostly a question of what job is being asked. The Mustang replaced the Thunderbolt in the long-range escort role in Europe because it went further on less fuel, and eventually every Eighth Air Force fighter group except the 56th converted to it.

The P-47 was the better aircraft to be shot at in. Its air-cooled radial and heavy structure brought pilots home from damage that would have downed a liquid-cooled fighter, which is exactly why it dominated the fighter-bomber role while the Mustang took the escort mission.

In the air the Thunderbolt’s advantages were roll rate, dive acceleration and high-altitude power. Early P-47s could be out-turned and out-climbed by the Bf 109 and Fw 190 at low and medium altitude, and the standard tactic was to fight in the vertical with energy rather than turn with German fighters.

How Many P-47 Thunderbolts Are Left?

Thunderbolts were not popular on the postwar civilian market. They had none of the sleek lines that made surplus fighters attractive as racers or executive aircraft, so most were scrapped rather than sold.

The population only began to recover in the late 1960s, when retired Peruvian aircraft were imported into the United States, followed by more airframes from other South American air forces in the 1970s and 1980s and rediscovered examples from Yugoslavia.

The community-maintained survivor census listed 15 P-47s as airworthy at its August 2026 revision, with 33 more on display and about 10 under restoration or in storage across 15 countries. All but one of the flyable aircraft are in the United States, the exception being Nellie at Duxford in the United Kingdom.

Almost every airworthy example is museum-operated rather than privately traded, so Thunderbolts come to market rarely. In 1945 a new one cost the government about $83,000.

Frequently Asked Questions

Was the P-47 a good fighter?

Yes, with a caveat about altitude. The P-47 ended the war with a 4.6 to 1 aerial kill ratio over more than 746,000 sorties, and it was outstanding above 20,000 feet, in a dive and in the fighter-bomber role. Early models climbed and turned poorly at low altitude, a weakness that paddle-blade propellers from early 1944 substantially reduced.

Are there any P-47s still flying?

Yes, but very few. The surviving-aircraft census listed 15 airworthy P-47s at its August 2026 revision, all but one of them in the United States and nearly all museum-operated. A further 33 are on static display and roughly 10 are under restoration or in storage.

Was the P-51 better than the P-47?

For long-range bomber escort, yes, which is why the Mustang replaced the Thunderbolt in that role in Europe. For ground attack and for surviving battle damage the P-47 was better, thanks to its air-cooled radial engine and heavy structure. The two aircraft were eventually used for different jobs rather than ranked against each other.

How many kills did the P-47 have?

The type finished the war with an aerial kill ratio of 4.6 to 1 across all theaters. The highest-scoring single unit was the 56th Fighter Group with 677 and a half aerial victories plus 311 aircraft destroyed on the ground, and its leading pilot, Francis Gabreski, scored 28.

How fast was the P-47 Thunderbolt?

Museum sources publish a maximum speed of 433 mph (696 km/h) for the P-47D. Wikipedia’s P-47D-40 specification records 444 mph (715 km/h) at 23,200 feet with water injection running, and 430 mph (692 km/h) at 25,400 feet without it. Normal cruise was about 350 mph (563 km/h).

What engine did the P-47 use?

A single Pratt & Whitney R-2800 Double Wasp, an 18-cylinder air-cooled twin-row radial, in the R-2800-59 version on the P-47D. Its takeoff and military rating is 2,000 hp, rising to a war emergency rating of 2,535 hp with water injection. A General Electric turbosupercharger in the rear fuselage kept it making power at high altitude.

What guns did the P-47 carry?

Eight .50 in (12.7 mm) M2 Browning machine guns, four in each wing, with 425 rounds per gun and 3,400 rounds in total. The aircraft could also carry up to 2,500 lb (1,134 kg) of bombs or ten 5 in High Velocity Aircraft Rockets.

What is a P-47 razorback?

Razorback is the nickname for the early P-47 configuration, which had a metal-framed canopy and a raised spine running back from it to the tail. From the P-47D-25-RE the spine was cut down and a clear bubble canopy fitted, giving the pilot a rearward view the razorback did not have.

Why was the P-47 called the Jug?

“Jug” is the affectionate wartime nickname for the Thunderbolt, a reference to the deep, bulbous fuselage that housed the turbosupercharger and its ducting. The same shape prompted one pilot to compare flying it to flying a bathtub around the sky.

Can you buy a P-47 Thunderbolt?

Rarely. With only about 15 airworthy examples worldwide and most of those held by museums, flyable P-47s almost never come to market. Restoration projects and wreck recoveries change hands more often than flying aircraft.

What was the P-47’s range?

About 1,030 miles on internal fuel, which the specification panel records as 900 nautical miles. With a full 595 US gallon load including external tanks a P-47D could reach roughly 1,800 miles at 10,000 feet, though useful combat radius on an escort mission was far shorter.

How many P-47 Thunderbolts were built?

15,636 in total between 1941 and 1945, with some references giving 15,683, making it the American fighter built in the largest numbers during the war. More than 12,500 of those were P-47Ds, built at Republic’s Farmingdale and Evansville plants, with a further 354 P-47Gs built by Curtiss-Wright at Buffalo. Orders for another 5,934 aircraft were canceled when the war ended.