Republic XP-47J Superbolt

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)

Powerplant

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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