Republic XP-47J Superbolt

1st Flight 1944

A similar attempt to improve performance resulted in the XP-47J.

Unlike the XP-47H, the sole XP-47J was a newly built airframe, with many changes to reduce weight.

The aircraft was fitted with a 2,800 hp R-2800-57C engine with a CH-5 supercharger, housed in a redesigned streamlined cowling.

Armament was reduced to six M2 Brownings.

The XP-47J was first flown on November 26, 1943, and on August 4, 1944, it became the first piston-engined

fighter to exceed 500 mph, with a speed of 504 mph, making it the fastest Thunderbolt variant.

Specifications

Crew 1

Dimensions

Length:

33.30 ft (10.15 m) Width:

40.78 ft (12.43 m) Height:

14.21 ft (4.33 m)

Weights

Empty Weight

9,663 lb (4,383 kg)

Max Take Off Weight

16,788 lb (7,615 kg)Power

1 x Pratt & Whitney R-2800-57C turbo, supercharged, air-cooled, radial piston engine developing 2,800 horsepower and driving a four-bladed propeller.

Performance

Max Speed:

505 mph (813 kph; 439 kts)

Service Ceiling:

44,997 feet (13,715 m; 8.52 miles)

Max Range:

1,072 miles (1,725 km; 931 nm)

Rate-of-Climb

4,900 ft/min (1,494 m/min)

Armament

6 x 0.50 calibre Browning heavy machine guns.

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