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XP-72
Role Fighter
Manufacturer Republic Aviation Company
First flight 2 February 1944
Status Cancelled
Number built 2
Developed from Republic P-47

The Republic XP-72 was an American prototype interceptor fighter developed as a progression of the P-47 Thunderbolt design. The XP-72 was designed around the Pratt & Whitney R-4360 twenty-eight cylinder radial air-cooled engine with a supercharger mounted behind the pilot and driven by an extension shaft from the engine. The armament consisted of six 0.5 in wing-mounted machine guns and underwing racks for two 1,000 lb bombs.

Contents

Design and development

The XP-72 development paralleled that of another Republic design, the XP-69 that was to be powered by an experimental forty-two cylinder Wright R-2160 radial engine mounted behind the pilot and driving contra-rotating propellers through an extension shaft. The XP-69 was intended for high altitude operations and featured a pressurized cockpit and armament of two 37 mm cannon and four 0.5 in machine guns. As the XP-72 displayed greater promise than the XP-69, the XP-69 was canceled on 11 May 1943 and an order for two XP-72 prototypes was placed on 18 June 1943.

Operational history

The XP-72 flew for the first time on 2 February 1944, equipped with a four bladed propeller. The second prototype was completed on 26 June 1944 and was equipped with an Aero-Products contra-rotating propeller. As the XP-72 displayed exceptional performance during flight tests an order for 100 production aircraft was awarded. The order included an alternate armament configuration of four 37 mm cannon. By this time the war had progressed to where the need was for long-range escort fighters and not high-speed interceptors. Also, the advent of the new turbojet-powered interceptors showed greater promise for the interceptor role. Thus, the production order for the P-72 was cancelled.

Specifications (XP-72)

General characteristics

  • Crew: One
  • Length: 36 ft 7 in (11.15 m)
  • Wingspan: 40 ft 11 in (12.47 m)
  • Height: 16 ft (4.88 m)
  • Wing area: 300 ft² (27.9 m²)
  • Empty weight: 11,476 lb (5,216 kg)
  • Loaded weight: 14,433 lb (6,560 kg)
  • Max takeoff weight: 17,490 lb (7,950 kg)
  • Powerplant:Pratt & Whitney R-4360-13 radial engine, 3,000 hp @ sea level (dash 13 engine) (2,574 kW)

Performance

Armament

See also

Related development

References

Notes
  1. ^ Bodie 1974, p. 33. Note: Test pilot Tom Bellinger stated flatly that the no flights ever exceeded 500 mph. The dash 13 engine was not supercharged. With the planned but never installed dash 19 engine (with a remote supercharger) rated at 3,650 HP at 25,000 ft. (3,000 HP at sea level) a top speed of 504 mph at approximately 25,000 feet was expected. Planned further development of the dash 19 engine was expected to yield approx 4,000 hp and a speed of 540 mph at 25,000 ft.
Bibliography
  • Bodie, Warren. "The Whine of the Jug". Wings Magazine (Vol. 4, No. 4), August 1974, p. 33-39.
  • Freeman, Roger A. Thunderbolt: A Documentary History of the Republic P-47. London: Macdonald & Jane's (Publishers) Ltd., 1978. ISBN 0-354-01166-9.
  • Green, William. War Planes of the Second World War - Fighters (Volume Four). London: Macdonald & Co.(Publishers) Ltd., 1961. ISBN 0-356-01448-7.
  • Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: US Army Air Force Fighters, Part 2. London: Macdonald & Jane's (Publishers) Ltd., 1978. ISBN 0-354-01072-7.
  • Jarski, Adam and Robert Michulec. P-47 Thunderbolt, P-35/P-43/XP-72 (Monografie Lotnicze 26) (in Polish). Gdynia: AJ-Press, 1996. ISBN 83-86208-41-4.
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