Pratt & Whitney J52#Variants

The J52 was developed in the mid-1950s for the US Navy as a scaled-down derivative of the J57/JT3A.Gunston 2006, p.154 It was initially intended to power the A4D-3 Skyhawk, an advanced avionics model that was canceled in 1957. After being canceled, the U.S. Air Force selected the J52 to power the AGM-28 Hound Dog cruise missile. The engine was designed with several unique features for this application, including a "conical centerbody mounted in the intake" and a "variable central plug ... in the nozzle".[https://www.flightglobal.com/pdfarchive/view/1961/1961%20-%200994.html Quotations from Flight, 1961] Then, in 1958, the US Navy selected the engine to power what became the A-6 Intruder.

The J52-P-6 model, designed for the YA2F-1 (YA-6A) Intruder, had a unique nozzle that could be angled downward at 23 degrees for STOL takeoffs; this was not used on production A-6s. Returning full circle, the J52 was selected to power the A4D-5, another model of the A-4 Skyhawk, remaining in all subsequent new-built models.Aero Engines 1961 (1961). Flight, July 20, 1961. pp 93-94.

The twin-spool J52 employs a split 12-stage axial compressor consisting of a five-stage low pressure unit and a seven-stage high pressure unit. Behind the compressor is a nine-unit can-annular combustion chamber and a two-stage split turbine.

File:Boeing B-52F takeoff with AGM-28 Hound Dog missiles.jpg

In 1960, U.S. Air Force's Strategic Air Command (SAC) developed procedures so that the Boeing B-52 Stratofortress could use the Hound Dog's J52 engine for additional thrust while the missile was located on the bomber's two pylons. This helped heavily laden B-52s fly away from their airbases faster, which would have been useful in case of nuclear attacks on the bases. The Hound Dog could then be refueled from the B-52's wing fuel tanks.National Museum of the Air Force. North American AGM-28B Hound Dog. {{cite web|url=http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id%3D383 |title=Fact Sheets : North American AGM-28B Hound Dog : North American AGM-28B Hound Dog |access-date=2007-10-29 |url-status=dead |archive-url=https://web.archive.org/web/20071115211713/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=383 |archive-date=2007-11-15 }} Access date: 20 October 2007.

File:AGM-28 Hound Dog.jpg

File:YA2F-1 tilting pipes NAN6-60.jpg

;J52-P-3

:Flown in: AGM-28 Hound Dog. This variant produced {{convert|7500|lbf|abbr=on}} of thrust. The design of the P-3 model included a variable inlet duct to improve engine efficiency at the various altitudes the cruise missile was designed to fly at.Griswold, W.S., "Mightiest Bomber Fires 1,000 Mile Missile" (1958). Popular Science. Sept. 1958, p.90-91.

;J52-P-6

:Flown in: A-6A. This variant produced {{convert|8500|lbf|abbr=on}} of thrust and included the 23-degree downward swiveling nozzle.

;J52-P6A

:Flown in: A-4E, TA-4J, EA-6B (the first few). This variant produced {{convert|8500|lbf|abbr=on}} of thrust.

;J52-P-8A/B

:Flown in: A-4F/G/H/K, TA-4E/F/G/H, A-6E, EA-6B. This variant produced {{convert|9300|lbf|abbr=on}} of thrust.

;J52-P-408

:Flown in: A-4M/N, TA-4KU, EA-6B. This variant included variable inlet guide vanes (VIGV) in the LPC, air-cooled turbine blades, and produced {{convert|11200|lbf|abbr=on}} of thrust.[http://a4skyhawk.org/content/technical-data A-4 Skyhawk technical information - skyhawk.org] {{webarchive|url=https://web.archive.org/web/20140814064746/http://a4skyhawk.org/content/technical-data |date=2014-08-14 }} Retrieved: 29 July 2009 Still in operation with Argentina, Brazil, and Indonesia

;J52-P-409

:(PW1212) {{convert|12000|lbf|kN|abbr=on}} thrust version of the J52-P-408 with an improved low pressure turbine (LPT) and faster acceleration. Designed for the EA-6B and was additionally marketed as an upgrade for the A-4. The J52-P-409 was also proposed as a cost-effective upgrade to the A-6E as an alternative to the A-6F Intruder II,Greeley, B.M. Jr., "Congressional Clash Threatens A-6F, A-6E Compromise Effort" (1988). Aviation Week & Space Technology, Jan. 11, 1988. p.18. but was not purchased. The P-409 engine was also proposed for use in the EA-6B ADVCAP,Polmar, N. "EA-6B Prowler" (2001). The Naval Institute Guide to Ships and Aircraft of the U.S. Fleet, 17th Ed. 2001. p416-417. but that program was canceled after three prototypes were built and flown. The P-409 would have been available as a new engine or as an upgrade kit for P-408 engines, but was never ordered in significant quantities."P&W provides more EA-6 power" (1987). Flight International, Sept. 19, 1987. p.15."Uprated A-4 Marketed" (1988). Flight International, Feb. 13, 1988. p.16.

;PW1212:J52-P-409 re-designated

;PW1216

:An afterburning derivative of the J52-P409 engine proposed for the Grumman Sabre II concept (the project later evolved into the JF-17 Thunder). The afterburner, designed in China, would have increased thrust to {{convert|16000|lbf|kN|abbr=on}}."[http://www.flightglobal.com/pdfarchive/view/1987/1987%20-%201876.html?search=Sabre%20II Pratt & Whitney's PW1216 turbojet]" (1987). Flight International. September 26, 1987. Page 62.

;JT8A:Company designation for initial versions of the J52

;JT8B-1:(J52-P-6 / P-6A)

;JT8B-3:(J52-P-8A)

• AGM-28 Hound Dog
• Dassault Super Mystère
• Douglas A-4 Skyhawk
• Grumman A-6 Intruder
• Lockheed Martin A-4AR Fightinghawk
• Northrop Grumman EA-6B Prowler
• LIMRV - On 14 August 1974, the LIMRV achieved a world record speed of 255.7 mph (411.5 km/h)

{{jetspecs|

|ref=Flight [http://www.flightglobal.com/pdfarchive/view/1973/1973%20-%200042.html Flightglobal archive - Flight International, 4 January 1973] Retrieved: 29 July 2009

|type=turbojet

|length=118 in (300 cm)

|diameter=38 in (96.5 cm)

|weight=2,318 lb (1,052 kg)

|compressor=axial flow, 5-stage LP, 7-stage HP

|combustion=

|turbine=single stage HP, single stage LP

|fueltype=JP-4

|oilsystem=

|power=

|thrust={{convert|11200|lbf|kN|abbr=on}}

|compression=14.6 : 1

|aircon=143 lb/s

|turbinetemp=

|fuelcon=

|specfuelcon={{convert|0.79|tsfc|si tsfc}}

|power/weight=

|thrust/weight=4.83

}}

{{aircontent

|related=

• Pratt & Whitney J57/JT3A
• Pratt & Whitney JT8D

|similar engines=

• Armstrong Siddeley Sapphire
• Rolls-Royce Avon

|lists=

• List of aircraft engines

|see also=

}}

{{Reflist|2}}

{{refbegin}}

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}
• Jane's Information Group. Pratt & Whitney J52. Jane's Aero Engines. Modified 29 May 2009.
• {{cite book |last= Gunston |first= Bill |title= The Development of Jet and Turbine Aero Engines, 4th Edition |year= 2006 |publisher= Patrick Stephens, Haynes Publishing |location= Sparkford, Somerset, England, UK |isbn= 0-7509-4477-3 }}

{{refend}}

{{Commons category}}

• [https://web.archive.org/web/20150304012230/http://www.pw.utc.com/J52_Engine Pratt & Whitney - J52]

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Category:1950s turbojet engines

J52