169:, the EJ22 turbofan was designed as a three spool engine having a fan, two axial compressors and three expansion turbines. As a result, the engine was significantly more complicated than any prior Williams International engine. While very impressive on the test stand, the EJ22 proved quite temperamental during the two years of its development process and it was frequently subject to problems starting, overheating, part failures and various subsystem issues.
109:(AGATE), to partner with manufacturers and help develop technologies that would revitalize the sagging general aviation industry. In 1996, Williams joined AGATE's General Aviation Propulsion (GAP) program to develop a clean-sheet fuel-efficient turbofan engine that would be even smaller than the FJ44 and designated the
136:. Development of the FJX-2 engine progressed, most of the design work was completed during 1998 with initial prototype parts being delivered in the second quarter of that year. The program ultimately culminated with altitude testing at the NASA Glenn Research Propulsion Systems Laboratory from March - April 2000.
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The FJX-2 engine was designed with many experimental systems and manufacturing processes to minimize parts count, lower production costs and have a bypass ratio of 4:1. As a result, there were many technical difficulties and failures of the initial prototype hardware. However, subsequent re-designs
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In 2000, Williams joined with
Eclipse Aviation to develop an FAA-certified version of the FJX-2, designated the EJ22, to be used on the Eclipse 500 VLJ due for first flight in June 2002. The new EJ22 powered the Eclipse 500 prototype on its first flight in the summer of 2002, but never flew with the
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series. Following termination of the contract, development work and FAA certification was halted shortly thereafter. Eclipse initially required the engine to produce 770 lbf (3,400 N) thrust, exceeding the 700 lbf (3,100 N) rating of the FJX-2 by 10%.
132:(VLJ) to use as a testbed and technology demonstrator to showcase the new engine. The aircraft, powered by two interim FJX-1 man-rated version of Williams' cruise-missile engine, debuted at the 1997
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and the incorporation of more conventional systems resulted in the engine eventually meeting the NASA requirement of 700 lbf (3,100 N) thrust.
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with the EJ22 but viewed its obligations as accomplished, implying that the aircraft was too heavy. Eclipse switched to the more powerful
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325:"Eclipse Aviation Completes Two Successful Flights of First Eclipse 500 Certification Flight Test Aircraft"
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engine. This provided $ 100 million in research and development funding for the new engine.
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EJ22 again and
Eclipse terminated their contract in late 2002, stating:
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Williams
International had been building small turbofan engines for
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applications since the 1960s, and had successfully entered the
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1 fan, nine stages of axial compression, 5-stage HP
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371:"The General Aviation Propulsion (GAP) Program"
107:Advanced General Aviation Transport Experiments
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327:(Press release). 2004-12-31. Archived from
432:Williams Research / Williams International
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192:3-spool medium-bypass ratio turbofan
116:Initially, Williams contracted with
73:engine that was being developed by
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307:"The Little Engine That Couldn't"
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167:thrust-specific fuel consumption
150:Pratt & Whitney Canada PW600
305:Noland, David (November 2005).
144:, while Williams acknowledged
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81:(VLJ) aircraft applications.
537:Three-spool turbofan engines
522:High-bypass turbofan engines
241:LP, IP and HP axial turbines
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264:722 lbf (3,210 N)
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532:Williams aircraft engines
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204:14.5 in (37 cm)
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198:41 in (104 cm)
165:To achieve the required
146:"a number of challenges"
124:to design and build the
101:engine. That same year,
97:market in 1992 with the
210:96 lb (44 kg)
184:General characteristics
527:2000s turbofan engines
278:Thrust-to-weight ratio
75:Williams International
50:Williams International
105:initiated a program,
311:Smithsonian Magazine
376:. NASA. July 2008.
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247:aviation kerosene
126:Williams V-Jet II
122:Scaled Composites
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356:. 7 August 2022.
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95:general aviation
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134:Oshkosh Airshow
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35:National origin
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130:Very Light Jet
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40:United States
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333:. Retrieved
329:the original
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269:Bypass ratio
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69:was a small
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393:. Williams.
252:Performance
221:Compressor:
208:Dry weight:
85:Development
516:Categories
335:2007-04-29
287:References
245:Fuel type:
228:Combustors
215:Components
118:Burt Rutan
56:First run
443:Turbofans
202:Diameter:
178:Data from
354:Minijets
258:Maximum
71:turbofan
28:Turbofan
237:Turbine
232:annular
196:Length:
391:"FJ22"
260:thrust
157:Design
374:(PDF)
190:Type:
111:FJX-2
59:2000
24:Type
19:EJ22
501:WR24
496:WR19
486:J400
481:FJ44
476:FJ33
471:F122
466:F121
461:F112
456:F107
451:EJ22
282:7.52
180:NASA
128:, a
103:NASA
99:FJ44
77:for
65:The
491:WR2
273:4:1
120:'s
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382:^
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295:^
424:e
417:t
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