Pratt & Whitney J48

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.

Several aircraft types used the J48 engine during the 1950s, including the Grumman F9F-5 Panther.[https://web.archive.org/web/19980703151007/http://www.history.navy.mil/branches/hist-ac/f9f.pdf 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.[https://web.archive.org/web/20141027044120/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2384 North American YF-93A]. National Museum of the US Air Force fact sheet. Accessed 2017-07-16

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

;J48-P-1: {{cvt|6000|lbf|kN}} dry, {{cvt|8000|lbf|kN}} thrust with afterburning

;J48-P-2: {{cvt|6250|lbf|kN}}, {{cvt|7000|lbf|kN}} thrust with water injection

;J48-P-3: {{cvt|6000|lbf|kN}}, {{cvt|8000|lbf|kN}} thrust with afterburning

;J48-P-5: {{cvt|6350|lbf|kN}}, {{cvt|8750|lbf|kN}} thrust with afterburning

;J48-P-6: {{cvt|6250|lbf|kN}}, {{cvt|7000|lbf|kN}} thrust with water injection

;J48-P-6a: {{cvt|6250|lbf|kN}}, {{cvt|7000|lbf|kN}} thrust with water injection

;J48-P-7: {{cvt|6350|lbf|kN}}, {{cvt|8750|lbf|kN}} thrust with afterburning

;J48-P-8: {{cvt|7250|lbf|kN}} thrust

;J48-P-8A: {{cvt|7250|lbf|kN}} thrust

; Turbo-Wasp JT-7: Commercial engines / company designation

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

File:Pratt-Whitney J48 NAN4-50.jpg

{{jetspecs

|ref= Aircraft engines of the World 1957{{cite book |last=Wilkinson |first=Paul H. |title=Aircraft engines of the World 1957 |year=1957 |publisher=Sir Isaac Pitman & Sons Ltd. |location=London |edition=15th |pages=98–99}}

|type=turbojet with water injection{{cite book |last=Wilkinson |first=Paul H. |title=Aircraft engines of the World 1955 |year=1955 |publisher=Sir Isaac Pitman & Sons Ltd. |location=London |edition=13th }}

|length= {{convert|109.75|in|mm|abbr=on}} without fixed nozzle

|diameter= {{convert|50.5|in|mm|abbr=on}}

• Frontal area: {{cvt|13.9|sqft}}

|weight= {{convert|2080|lb|kg|abbr=on}} dry

|compressor= single-stage double-sided centrifugal compressor

|combustion=nine interconnected can combustion chambers

|turbine=single stage axial

|fueltype=aviation kerosene / JP-4

|oilsystem=pressure spray with scavenge at {{cvt|40|psi}}

|power=

|thrust=dry {{convert|7250|lbf|kN|abbr=on}} thrust for take-off; wet {{cvt|8500|lbf|kN}}

|compression=4.5:1

|aircon={{cvt|130|lb/s|kg/s}} at 11,000 rpm

|turbinetemp=

|fuelcon=

|specfuelcon={{convert|1.14|tsfc|si tsfc}}

|power/weight=

|thrust/weight=3.57

}}

{{Aircontent

|related=

• Rolls-Royce RB.44 Tay
• Rolls-Royce Nene/Pratt & Whitney J42

|similar engines=

|lists=

• List of aircraft engines

|see also=

}}

;Notes

{{reflist}}

;Bibliography

{{refbegin}}

• {{cite book |last= Bishop |first= Chris |author2=Chris Chant |title= Aircraft Carriers: The world's greatest naval vessels and their aircraft |year= 2004 |publisher= Zenith Press|location= Minneapolis, MN |isbn= 978-0-7603-2005-1}}
• {{cite book|last= Connors |first= Jack |title= The Engines of Pratt & Whitney: A Technical History |publisher= American Institute of Aeronautics and Astronautics |location= Reston. Virginia |year= 2010 |isbn= 978-1-60086-711-8 }}
• {{cite book |last= Gunston |first= Bill |title= World Encyclopedia of Aero Engines, 5th Edition |year= 2006 |publisher= Sutton Publishing Limited |location= Phoenix Mill, Gloucestershire, England, UK |isbn= 0-7509-4479-X }}
• {{cite book|last=Kay|first=Anthony L.|title=Turbojet History and Development 1930–1960 Volume 2:USSR, USA, Japan, France, Canada, Sweden, Switzerland, Italy and Hungary |publisher=The Crowood Press|location=Ramsbury|year=2007|edition=1st|isbn=978-1861269393}}

{{refend}}

{{Commons category}}

• [https://web.archive.org/web/20141011151655/http://www.pw.utc.com/J48_Engine Pratt & Whitney History page on the J48]

{{P&W gas turbine engines}}

{{USAF gas turbine engines}}

{{DEFAULTSORT:Pratt and Whitney J48}}

Tay

Category:1940s turbojet engines

Category:Centrifugal-flow turbojet engines