Williams FJ44

Production started in 1992 with the {{Convert|1900|lbf|kN|abbr=on|lk=on}} thrust FJ44-1A. The FJ44-1C is derated to {{Convert|1500|lbf|kN|abbr=on}}.

The uprated to {{Convert|2300|lbf|kN|abbr=on}} FJ44-2A was introduced in 1997.

The {{Convert|2820|lbf|kN|abbr=on}} thrust FJ44-3A was introduced in 2004.

In 2005, a new low end version, the FJ44-1AP, was introduced, with a {{Convert|1965|lbf|kN|abbr=on}} takeoff thrust.

Released in 2007 was the new {{Convert|3600|lbf|kN|abbr=on}} thrust FJ44-4. In 2010 this engine was in use on the Cessna CJ4, and since 2018 also on the new Pilatus PC-24.

==Design==

The FJ44-1A has a single stage blisk fan plus a single intermediate pressure (IP) booster stage, both driven by a 2 stage low pressure (LP) turbine, and supercharging a single stage centrifugal high pressure (HP) compressor, driven by a single stage uncooled high pressure (HP) turbine. The combustor is an impingement cooled annular design. Fuel is delivered to the combustor through an unusual rotating fuel nozzle system, rather than the standard fuel-air mixers or vapourisers. The bypass duct runs the full length of the engine.

The FJ44-2A has two additional booster compressor stages.

;FJ44-1A

: {{Convert|1900|lbf|kN|abbr=on|lk=on}} thrust, production started in 1992, {{Convert|20.9|in|mm|abbr=on}} diameter fan, SFC at full thrust at SLS, ISA is understood to be 0.456 lb/(hr lbf),

;FJ44-1AP

: {{Convert|1965|lbf|kN|abbr=on}} takeoff thrust, introduced in 2005, 5% better specific fuel consumption, lower internal temperatures, similar to the -1A with a higher pressure ratio fan, a new combustor and LP turbine, a new full length bypass duct/exhaust mixer and a dual channel FADEC.[http://www.williams-int.com/high/product/engines/fj44-1ap.htm FJ44-1AP] {{Webarchive|url=https://web.archive.org/web/20060505044353/http://www.williams-int.com/high/product/engines/fj44-1ap.htm |date=2006-05-05 }} at [http://www.williams-int.com www.williams-int.com], Accessed 2006-05-07

;FJ44-1C

: {{Convert|1500|lbf|kN|abbr=on}} thrust, derated version of the FJ44-1A, SFC of {{Convert|0.460|lb/lbf/h|kg/kN/h|abbr=on}}.[http://www.williams-int.com/high/product/engines/fj44-1.htm FJ44-1] {{Webarchive|url=https://web.archive.org/web/20060505044413/http://www.williams-int.com/high/product/engines/fj44-1.htm |date=2006-05-05 }} at [http://www.williams-int.com www.williams-int.com], Accessed 2006-05-07[http://defence.rolls-royce.com/FJ44-gas-turbines-for-trainer-aircraft/ FJ44 for military trainer aircraft] {{Webarchive|url=https://web.archive.org/web/20070311031549/http://defence.rolls-royce.com/FJ44-gas-turbines-for-trainer-aircraft/ |date=2007-03-11 }} at [http://defence.rolls-royce.com defence.rolls-royce.com] {{Webarchive|url=https://web.archive.org/web/20060428182356/http://defence.rolls-royce.com/ |date=2006-04-28 }}, Accessed 2006-05-07

;FJ44-2A

: {{Convert|2300|lbf|kN|abbr=on}} thrust, introduced in 1997, larger {{Convert|21.7|in|mm|abbr=on}} diameter fan, with two additional booster stages to increase core flow, centrifugal compressor throttled-back aerodynamically to a lower HPC pressure ratio than the -1, exhaust mixer and a fuel electronic control unit.[http://www.williamsint.com/high/product/engines/fj44-2.htm FJ44-2] at [http://www.williams-int.com www.williams-int.com], Accessed 2006-05-07

;FJ44-2C

: {{Convert|2400|lbf|kN|abbr=on}} thrust, similar to the -2A with an integrated hydromechanical fuel control unit.

;FJ44-3A

: {{Convert|2820|lbf|kN|abbr=on}} thrust, 2004 introduction, similar to the -2A with a larger fan and dual channel FADEC unit.[http://www.williams-int.com/high/product/engines/fj44-3.htm FJ44-3] {{Webarchive|url=https://web.archive.org/web/20060505044406/http://www.williams-int.com/high/product/engines/fj44-3.htm |date=2006-05-05 }} at [http://www.williams-int.com www.williams-int.com], Accessed 2006-05-07

; FJ44-3A-24

: {{Convert|2490|lbf|kN|abbr=on}} thrust, derated -3A.

;FJ44-3AP

: {{Convert|3000|lbf|kN|abbr=on}} thrust.[http://www.williams-int.com/uploads/Williams%20Fanjet%20Family.pdf Williams Fanjet Family], Accessed 2020-02-20

;FJ44-4A

: {{Convert|3600|lbf|kN|abbr=on}} thrust, released in 2007, hi-tech fan of larger diameter than the -3 unit.[http://www.williams-int.com/information.html?pid=1 FJ44-4] {{Webarchive|url=https://web.archive.org/web/20100412043319/http://www.williams-int.com/information.html?pid=1 |date=2010-04-12 }} at [http://www.williams-int.com www.williams-int.com], Accessed 2010-03-12 Used on the Cessna CJ4 and the Pilatus PC-24.

;FJ44-4C

:3,450 lbf (15.3kN) thrust. Used on the upcoming Honda HA-480 Echelon.{{Cite web |title=plane announcement |url=https://www.aopa.org/news-and-media/all-news/2023/october/16/honda-goes-for-the-upper-echelon}}{{Cite web |title=honda specs |url=https://www.hondajet.com/-/media/HondaJet/Photos/HondaJet-Echelon/HondaJet_Echelon_Digital_Brochure_FINAL.pdf}}

;FJ44-4M

;Williams-Rolls F129

:Military designation for the derated FJ44-1C with {{Convert|1500|lbf|kN|abbr=on}} thrust.

File:OO-FLN.JPGs have been delivered by June 2017{{cite press release |url= http://txtav.com/en/newsroom/2017/06/textron-aviation-celebrates-light-jet-leadership-with-2000th-delivery-for-cessna-cj-family |title= Textron Aviation celebrates light jet leadership with 2,000th delivery for Cessna CJ family |date= June 8, 2017 |publisher= Textron Aviation}}

]]

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• Williams FJ33

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• List of aircraft engines

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Category:Medium-bypass turbofan engines

Category:1980s turbofan engines

FJ44

Category:Centrifugal-flow turbojet engines