Williams FJ44 explained

The Williams FJ44 is a family of small, two-spool, turbofan engines produced by Williams International for the light business jet market. Until the recent boom in the very light jet market, the FJ44 was one of the smallest turbofans available for civilian applications. Although basically a Williams design, Rolls-Royce was brought into the project at an early stage to design, develop, and manufacture an air-cooled high-pressure (HP) turbine for the engine. The FJ44 first flew on July 12, 1988 on the Scaled Composites/Beechcraft Triumph aircraft.

The Williams FJ33 is a newer, smaller engine based on the basic FJ44 design.

Development

Production started in 1992 with the 1900abbr=onNaNabbr=on thrust FJ44-1A. The FJ44-1C is derated to 1500lbf.The uprated to 2300lbf FJ44-2A was introduced in 1997.The 2820lbf thrust FJ44-3A was introduced in 2004.In 2005, a new low end version, the FJ44-1AP, was introduced, with a 1965lbf takeoff thrust.Released in 2007 was the new 3600lbf 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.

Variants

FJ44-1A
  • 1900abbr=onNaNabbr=on thrust, production started in 1992, 20.9inches diameter fan, SFC at full thrust at SLS, ISA is understood to be 0.456 lb/(hr lbf),
    FJ44-1AP
  • 1965lbf 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.[1]
    FJ44-1C
  • 1500lbf thrust, derated version of the FJ44-1A, SFC of 0.46lb/lbf/h.[2] [3]
    FJ44-2A
  • 2300lbf thrust, introduced in 1997, larger 21.7inches 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.[4]
    FJ44-2C
  • 2400lbf thrust, similar to the -2A with an integrated hydromechanical fuel control unit.
    FJ44-3A
  • 2820lbf thrust, 2004 introduction, similar to the -2A with a larger fan and dual channel FADEC unit.[5]
    FJ44-3A-24
  • 2490lbf thrust, derated -3A.
    FJ44-3AP
  • 3000lbf thrust.[6]
    FJ44-4A
  • 3600lbf thrust, released in 2007, hi-tech fan of larger diameter than the -3 unit.[7] Used on the Cessna CJ4 and the Pilatus PC-24.
    FJ44-4M
  • Williams-Rolls F129
  • Military designation for the derated FJ44-1C with 1500lbf (6.672kN) power output.

    Applications

    Variant Application Type Deliveries
    FJ44-1[8] Cessna CitationJet CJ1/CJ1+/M2 Business Jet 1993-
    Jet Trainer re-engine
    FJ44-2[9] Beechcraft Premier 1A Business Jet 2001-2012
    Cessna CitationJet CJ2 Business Jet 2000-2005
    Cessna Citation 501SP Business Jet re-engine
    Business Jet re-engine
    Experimental 1998
    Business Jet 2007-2009
    Business Jet re-engine
    Experimental 2005
    FJ44-3[10] Cessna CitationJet CJ2+/CJ3+ Business Jet 2004-
    Business Jet re-engine
    Nextant 400XTi Business Jet re-engine
    FJ44-4[11] Cessna CitationJet CJ4 Business Jet 2010-
    Business Jet re-engine
    Business Jet 2018-
    FJ44-4M Jet Trainer
    Light attack aircraft     		2022-
    not deliveredJet Trainer Under development
    Cessna 526 CitationJetJet Trainer 2 prototypes
    Business Jet 1 prototype
    Business Jet 4 prototypes
    Business Jet Cancelled
    Drone Crashed
    Drone Cancelled
    Piper PA-47 PiperJet/Altaire Business Jet 1 prototype
    Business Jet 1 prototype

    Specification

    Type Certificate Data Sheet[12] ! Variant! FJ44-1AP[13] ! FJ44-2[14] ! FJ44-3[15] ! FJ44-4[16]
    Configuration Twin-spool turbofan with 1-stage fan and annular combustor
    LP compressor 1-stage axial3-stage axial
    HP compressor 1-stage centrifugal
    Turbine1-stage HP, 2-stage LP
    Thrust
    Weight
    Length
    Diameter

    External links

    Notes and References

    1. http://www.williams-int.com/high/product/engines/fj44-1ap.htm FJ44-1AP
    2. http://www.williams-int.com/high/product/engines/fj44-1.htm FJ44-1
    3. http://defence.rolls-royce.com/FJ44-gas-turbines-for-trainer-aircraft/ FJ44 for military trainer aircraft
    4. http://www.williamsint.com/high/product/engines/fj44-2.htm FJ44-2
    5. http://www.williams-int.com/high/product/engines/fj44-3.htm FJ44-3
    6. http://www.williams-int.com/uploads/Williams%20Fanjet%20Family.pdf Williams Fanjet Family
    7. http://www.williams-int.com/information.html?pid=1 FJ44-4
    8. Web site: Airplanes with the FJ44-1 Engine . Williams International.
    9. Web site: Airplanes with the FJ44-2 Engine . Williams International.
    10. Web site: Airplanes with the FJ44-3 Engine . Williams International.
    11. Web site: Airplanes with the FJ44-4 Engine . Williams International.
    12. Web site: Type Certificate Data Sheet NO. E3GL . October 4, 2018 . FAA.
    13. News: FJ44-1AP . Williams International.
    14. News: FJ44-2 . Williams International.
    15. News: FJ44-3 . Williams International.
    16. News: FJ44-4 . Williams International.

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