FJ44 | |
---|---|
A Williams FJ44-3ATW turbofan engine | |
Type | Turbofan |
National origin | United States |
Manufacturer | Williams International |
First run | 1985 [1] |
Major applications | Beechcraft Premier I Cessna CitationJet Piper PiperJet Altaire Saab 105 Grob G180 SPn Pilatus PC-24 |
Developed into | Williams FJ33 |
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.
Production started in 1992 with the 1,900 lbf (8.5 kN ) thrust FJ44-1A. The FJ44-1C is derated to 1,500 lbf (6.7 kN). The uprated to 2,300 lbf (10 kN)FJ44-2A was introduced in 1997. The 2,820 lbf (12.5 kN) thrust FJ44-3A was introduced in 2004. In 2005, a new low end version, the FJ44-1AP, was introduced, with a 1,965 lbf (8.74 kN) takeoff thrust. Released in 2007 was the new 3,600 lbf (16 kN) thrust FJ44-4. In 2010 this engine was in use on the Cessna CJ4, and since 2018 also on the new Pilatus PC-24.
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.
Variant | Application | Type | Deliveries |
---|---|---|---|
FJ44-1 [10] | Cessna CitationJet CJ1/CJ1+/M2 | Business Jet | 1993- |
SAAB Sk60 | Jet Trainer | re-engine | |
FJ44-2 [11] | Beechcraft Premier 1A | Business Jet | 2001-2012 |
Cessna CitationJet CJ2 | Business Jet | 2000-2005 | |
Cessna Citation 501SP | Business Jet | re-engine [lower-alpha 1] | |
Cessna Citation 550 | Business Jet | re-engine [lower-alpha 2] | |
Scaled Composites Proteus | Experimental | 1998 | |
Syberjet SJ30 | Business Jet | 2007-2009 | |
Learjet 25 | Business Jet | re-engine [lower-alpha 3] | |
Virgin Atlantic GlobalFlyer | Experimental | 2005 | |
FJ44-3 [12] | Cessna CitationJet CJ2+/CJ3+ | Business Jet | 2004- |
Cessna Citation 550 | Business Jet | re-engine [lower-alpha 4] | |
Nextant 400XTi | Business Jet | re-engine | |
FJ44-4 [13] | Cessna CitationJet CJ4 | Business Jet | 2010- |
Hawker 400XPR | Business Jet | re-engine | |
Pilatus PC-24 | Business Jet | 2018- | |
FJ44-4M | Aero L-39 Skyfox | Jet Trainer Light attack aircraft | 2022- |
not delivered[ clarification needed ] | Alenia Aermacchi M-345 | Jet Trainer | Under development |
Cessna 526 CitationJet [lower-alpha 5] | Jet Trainer | 2 prototypes | |
Eviation Jets EV-20 Vantage Jet | Business Jet | 1 prototype | |
Grob G180 SPn | Business Jet | 4 prototypes | |
Hawker 200 | Business Jet | Cancelled | |
Lockheed Martin Polecat | Drone | Crashed | |
Lockheed Martin RQ-3 DarkStar | Drone | Cancelled | |
Piper PA-47 PiperJet/Altaire | Business Jet | 1 prototype | |
Scaled Composites Triumph | Business Jet | 1 prototype |
Variant | FJ44-1AP [15] | FJ44-2 [16] | FJ44-3 [17] | FJ44-4 [18] |
---|---|---|---|---|
Configuration | Twin-spool turbofan with 1-stage fan and annular combustor | |||
LP compressor | 1-stage axial | 3-stage axial | ||
HP compressor | 1-stage centrifugal | |||
Turbine | 1-stage HP, 2-stage LP | |||
Thrust | 1,900–2,100 lbf (8.5–9.3 kN) | 2,300–2,400 lbf (10.2–10.7 kN) | 3,000 lbf (13.3 kN) | 3,600 lbf (16.0 kN) |
Weight | 460 lb (209 kg) | 520–530 lb (236–240 kg) | 516–535 lb (234–243 kg) | 658 lb (298 kg) |
Length | 41.4 in (105 cm) | 47.2 in (120 cm) | 48.0 in (122 cm) | 52.8 in (134 cm) |
Diameter | 20.7 in (53 cm) | 21.8 in (55 cm) | 23.0 in (58 cm) | 25.3 in (64 cm) |
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