North American XA2J Super Savage

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XA2J "Super Savage"
XA2J-1 Super Savage in flight 1952.jpeg
The XA2J-1 Super Savage in flight in 1952
General information
Type Attack aircraft
National originUnited States
Manufacturer North American Aviation
StatusCancelled
History
Manufactured1
First flight4 January 1952
Developed from North American AJ Savage

The North American Aviation XA2J "Super Savage" was a prototype carrier-based attack aircraft built in the early 1950s. It was developed by North American Aviation (NAA) from the smaller AJ Savage.

Contents

Design and development

The XA2J-1 with folded wings XA2J-1 NAN3-53.jpg
The XA2J-1 with folded wings

The XA2J was intended to be a turboprop-powered derivative of the AJ Savage, with the design as initially proposed in December 1947 a simple modification of the Savage, with extensive use of components of the earlier aircraft. The design gradually evolved, however, to improve performance and increase compatibility with operations from aircraft carriers, [1] as it was recognized that the AJ Savage was deficient in performance and was a less-than-satisfactory carrier aircraft. [2]

The XA2J-1 during its first flight at Edwards Air Force Base, California, on 4 January 1952 XA2J-1 during first flight at Edwards AFB 1952.jpeg
The XA2J-1 during its first flight at Edwards Air Force Base, California, on 4 January 1952

The A2J was essentially an enlarged AJ Savage with the two reciprocating engines replaced with two Allison T40 turboprop engines and removal of the tail-mounted turbojet. Like the AJ, it was a high-winged monoplane with unswept wings. The wings were fitted with leading edge slats and large trailing edge flaps, and folded outside of the engine nacelles to ease storage aboard ship. It had a crew of three: pilot, co-pilot/bombardier, and gunner who sat in a pressurised cabin in the nose of the aircraft. Up to 10,500 lb (4,800 kg) of bombs could be carried in a large enclosed bomb-bay in the center fuselage, while the planned defensive armament was a remotely controlled tail turret with two 20 mm cannon. [3]

Construction of two prototypes started 1 October 1948, but due to delays developing the engines, the first flight was not until 4 January 1952. [4] The competing Douglas XA3D, the prototypes of which were ordered the year after construction had begun on the XA2J prototypes, first flew in October 1952. The A3D had far superior performance, which doomed the XA2J.

The root cause for the failure of the XA2J was the protracted development and poor reliability of the Allison T40 engines. The T40 engine was an ambitious engine design with two power sections, (the T38 was developed from the T40 to assist in its development, by using a single power section with extension shaft and gearbox), [5] driving two large contra-rotating propellers through a combining gearbox. Both the engines and the gearbox proved to be unreliable. The T40 engine was also used in the developmental of other aircraft. After a number of engine-related mishaps, the XA2J project was abandoned and the second prototype was never flown.

Operators

Flag of the United States (23px).png  United States

Specifications (XA2J-1)

3-view line drawing of the North American XA2J-2 North American XA2J-2 3-view line drawing.png
3-view line drawing of the North American XA2J-2

General characteristics

Performance

Armament

See also

Related development

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References

Notes

  1. Air Pictorial December 1959, p. 453.
  2. Miller 2001 , pp. 90–9
  3. Air Pictorial December 1959, p. 454.
  4. Wagner 1982 , pp. 389–490[ page needed ]
  5. Nolan, D. J. (8 August 1952). "TURBO-LINER : Development of the Allison T-38 Engine in a Convair 240" (pdf). Flight. LXII (2272): 157–159. Retrieved 5 January 2019.

Bibliography