Pratt & Whitney J48

The Pratt & Whitney J48 (company designation JT7 Turbo-Wasp) is a turbojet engine developed by Pratt & Whitney as a license-built version of the Rolls-Royce Tay. The Tay/J48 was an enlarged development of the Rolls-Royce Nene (Pratt & Whitney J42).

Design and development

In 1947, at the behest of the United States Navy, Pratt & Whitney entered into an agreement to produce the Rolls-Royce Nene centrifugal-flow turbojet engine under license as the J42 (company designation JT6), for use in the Grumman F9F Panther fighter aircraft.Connors, p.202 Concerned that the Nene would not have the potential to cope with future weight growth in improved versions of the Panther, Luke Hobbs, vice president of engineering for P&W's parent company, the United Aircraft Corporation, requested that Rolls-Royce design a more powerful engine based on the Nene, which Pratt & Whitney would also produce.

By 1948, Rolls-Royce had designed the Tay turbojet, also a centrifugal-flow design. However, as Rolls-Royce was then developing an improved design with an axial compressor, which would become the Avon, the development and production of the Tay turbojet was left to Pratt & Whitney.Gunston 2006, p.195. However, Rolls-Royce retained the rights to the Tay outside of the United States.

The Tay/J48 was a thirty percent enlargement of the preceding Nene/J42, and was produced both with and without afterburning.

Operational history Several aircraft types used the J48 engine during the 1950s, including the Grumman F9F-5 Panther.F9F Panther, U.S. Navy Historical Office. Accessed 2011-01-06. and Grumman F9F-6/F9F-8 Cougar,Bishop and Chant 2004, p. 154 The U.S. Air Force's Lockheed F-94C StarfireRAF Flying Review "TECHNICAL GEN" authors: staff, September 1962 p. 59 and North American YF-93 used afterburning versions of the J48 engine.North American YF-93A. National Museum of the US Air Force fact sheet. Accessed 2017-07-16

Variants

Data from The Engines of Pratt & Whitney: A Technical History.Connors, p.210

Thrust given in foot-pounds (lbf) and kilonewtons (kN).

J48-P-1 / with afterburning J48-P-2 / with water injection, powered some early Grumman F9F Panthers J48-P-3 / with afterburning J48-P-5 / with afterburning, powered the Lockheed F-94C Starfire J48-P-6 / with water injection, powered the North American YF-93 J48-P-6a / with water injection, powered the Grumman F9F-5 Panther J48-P-7 / with afterburning J48-P-8 , powered the Grumman F9F-6 Cougar J48-P-8A Turbo-Wasp JT-7 Commercial engines / company designation

Applications Grumman F9F-5 Panther Grumman F9F-6/-8 Cougar Lockheed F-94C Starfire North American YF-93

Specifications (J48-P-8A)

Pratt & Whitney J48

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