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FJ44 Type Turbofan National origin United States Manufacturer Williams International First run 1980s Major applications Beechcraft Premier I Cessna CitationJet Piper PiperJet Altaire Saab 105 Developed into Williams FJ33 The Williams FJ44 is a family of small, two-spool, turbofan engines produced by Williams International/Rolls-Royce 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 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 smaller engine based on the basic FJ44 design. Contents 1 Design and development 2 Variants 3 Applications 4 Specification 5 See also 6 References 7 External links // Design and development Production started in 1992 with the 1900 lbf (2.58 kN) thrust FJ44-1A, which comprises a 20.9 in (531 mm) diameter single stage blisk fan plus a single intermediate pressure (IP) booster stage, driven by a 2 stage low pressure (LP) turbine, 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 the engine. Specific fuel consumption at 1900 lbf (2.58 kN) thrust at SLS, ISA is understood to be 0.456lb/hr/lbf. A derated version, the 1500 lbf (2.03 kN) thrust FJ44-1C has an SFC of 0.460lb/hr/lbf.[1][2] An uprated version, the 2,300 lbf (10,000 N) thrust FJ44-2A, was introduced in 1997. It has a larger 21.7 in (551 mm) diameter fan, with two additional booster stages to increase core flow. Owing to stressing considerations, the centrifugal compressor is throttled-back aerodynamically to a lower HPC pressure ratio than the -1. Other features include an exhaust mixer and an electronic fuel control unit.[3] The 2400 lbf (3.25 kN) thrust FJ44-2C is similar to the -2A, but incorporates an integrated hydromechanical fuel control unit. Further uprates include the 2004 introduction of the 2820 lbf (3.82 kN) thrust FJ44-3A, which is similar to the -2A, but features an increased diameter fan and dual channel FADEC (Full Authority Digital Engine Control) unit. [4] The 2490 lbf (3.38 kN) thrust FJ44-3A-24 is a derated version of the -3A. In 2005, a new low end version, the FJ44-1AP, was introduced, with a 1965 lbf (2.66 kN) takeoff thrust, 5% better specific fuel consumption, and lower internal temperatures. The -1AP is similar to the -1A, except for a higher pressure ratio fan, a new combustor and LP turbine, a new full length bypass duct/exhaust mixer and a dual channel FADEC.[5] Released in 2007 was the new 3,600 lbf (16,000 N) thrust FJ44-4, which has a hi-tech fan of larger diameter than the -3 unit[6]. As of March 2010, this engine was only in use on the Cessna CJ4. Variants FJ44-1A FJ44-1AP FJ44-2A FJ44-3A FJ44-4 F129 Military designation for a derated FJ44 with 1500lbf (6.672kN) power output. Applications Source: [7] FJ44 Beechcraft Premier I Eviation Jets EV-20 Vantage Jet Cessna CitationJet Emivest SJ30 Grob G180 SPn Hawker 200 Lockheed Martin RQ-3 DarkStar Lockheed Martin Polecat Piper PA-47 PiperJet Piper PiperJet Altaire Saab 105 Scaled Composites Proteus Scaled Composites Triumph Virgin Atlantic GlobalFlyer F129 Cessna 526 CitationJet Specification FJ44 Specifications FJ44-1A FJ44-1C FJ44-1AP FJ44-2A FJ44-2C FJ44-3A FJ44-3A-24 FJ44-4 Thrust (lbf) 1,900 1,500 1,965 2,300 2,400 2,820 2,490 3,600 Thrust (N) 8,452 6,672 8,741 10,231 10,676 12,544 11,076 15,569 Specific Fuel Consumption (lb/hr/lbf) 0.456 0.460 - - - - - - Dry Weight (lb) 460 460 468 530 520 535 535 650 Dry Weight (kg) 209 209 212 240 236 243 243 295 Overall Length (in) 53.3 53.3 57.9 59.8 59.8 62.4 62.4 68.6 Overall Length (mm) 1,354 1,354 1,471 1,519 1,519 1,585 1,585 1,742 Approximate Fan Diameter (in) 20.9 20.9 20.7 21.7 21.7 22.9 22.9 25.2 Approximate Fan Diameter (mm) 531 531 526 551 551 582 582 640 Bypass ratio 3.28[8] 3.28[8] - 4.1[8] - - - - See also Related development Williams FJ33 Related lists List of aircraft engines References ^ FJ44-1 at www.williams-int.com, Accessed 2006-05-07 ^ FJ44 for military trainer aircraft at defence.rolls-royce.com, Accessed 2006-05-07 ^ FJ44-2 at www.williams-int.com, Accessed 2006-05-07 ^ FJ44-3 at www.williams-int.com, Accessed 2006-05-07 ^ FJ44-1AP at www.williams-int.com, Accessed 2006-05-07 ^ FJ44-4 at www.williams-int.com, Accessed 2010-03-12 ^ Airplanes using FJ series engines at www.williams-int.com, Accessed 2006-05-07 ^ a b c Venik's Aviation - Jet Engines - USA External links Williams International product page v · d · eWilliams Research / Williams International aircraft engines Turbojets WR2 · J400 · WJ119 · P9005 Turbofans F107 · F112 · F121 · F415 · FJ22 · FJ33 · FJ44 · WR19 Turboshafts WR34 · WTS117 v · d · eUnited States military gas turbine aircraft engine designation system Turbojets J30 · J31 · J32 · J33 · J34 · J35 · J36 · J37 · XJ38 · J39 · J40 · J41 · J42 · J43 · J44 · J45 · J46 · J47 · J48 · J49 · J51 · J52 · J53 · J54 · J55 · J56 · J57 · J58 · J59 · J60 · J61 · J63 · J65 · J67 · J69 · J71 · J73 · J75 · J79 · J81 · J83 · J85 · J87 · J89 · J91 · YJ93 · J95 · J97 · J99 · J100 · YJ101 · J102 · J400 · J401 · J402 · J403 · J700 Turboprops/Turboshafts T30 · T31 · T33 · T34 · T35 · T36 · T37 · T38 · T39 · T40 · T41 · T42 · T43 · T44 · T45 · T46 · T47 · T48 · T49 · T50 · T51 · T52 · T53 · T54 · T55 · T56 · T57 · T58 · T60 · T61 · T62 · T63 · T64 · T65 · T66 · T67 · T68 · T69 · T70 · T71 · T72 · T73 · T74 · T76 · T78 · T80 · T100 · T101 · T400 · T405 · T406 · T407 · T408 · T700 · T701 · T702 · T703 · T706 · T708 · T800 Turbofans TF30 · TF33 · TF34 · TF35 · TF37 · TF39 · TF41 · F100 · F101 · F102 · F103 · F104 · F105 · F106 · F107 · F108 · F109 · F110 · F112 · F113 · F117 · F118 · F119 · YF120 · F121 · F122 · F124 · F125 · F126 · F127 · F128 · F129 · F135 · F136 · F137 · F138 · F400 · F401 · F402 · F404 · F405 · F408 · F412 · F414 · F415 v · d · eSwedish military gas turbine aircraft engine designation system RM1 · RM2 · RM4 · RM5 · RM6 · RM8 · RM9 · RM12 · RM14 · RM15 v · d · eLists relating to aviation General Timeline of aviation · Aircraft (manufacturers) · Aircraft engines (manufacturers) · Rotorcraft (manufacturers) · Airlines (defunct) · Airports · Civil authorities · Museums Military Air forces · Aircraft weapons · Experimental aircraft · Missiles · Unmanned aerial vehicles (UAVs) Accidents/incidents General · Commercial (airliners) · Military Records Airspeed · Altitude · Distance · Endurance · Most-produced aircraft