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{{Short description|Family of jet engines}}
{{Primary sources|date=November 2021}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox aircraft begin
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|manufacturer= [[Williams International]]
|first run= 1998 <ref>{{cite news |url= https://www.flightglobal.com/pdfarchive/view/1998/1998%20-%202944.html |title= P&WC unveils light jet study |work= Flight International |date= 28 October 1998}}</ref>
|major applications= [[Cirrus Vision SF50]] <br /> [[Diamond D-Jet]]
|number built =
|program cost =
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The '''Williams FJ33''' is an American family of [[turbofan]] [[jet engine]]s intended for use in [[very light jet]] aircraft. The FJ33 is a scaled-down version of the [[Williams FJ44|FJ44]] engine. The FJ33-5A is the latest version certified in June 2016.<ref>{{cite web|url=http://www.avweb.com/avwebflash/news/Williams-International-FJ33-5A-Turbofan-FAA-Certified-226377-1.html|title=Williams International FJ33-5A Turbofan FAA-Certified|date=8 June 2016|accessdate=10 June 2016}}</ref>
==Design==
Engine configuration is a single stage fan, with booster stage, driven by a two-stage LP turbine, supercharging a centrifugal HP compressor, driven by a single stage HP turbine.<ref>{{Cite web |title=EM-9303-05i |url=https://sistemas.anac.gov.br/certificacao/Produtos/Espec/EM-9303-05i.pdf |website=sistemas.anac.gov.br}}</ref> An [[combustor|annular combustor]] is featured.
The FJ33 has a dry weight of less than {{convert|300|lb|abbr=on}}, overall diameter of {{convert|18.36|in|abbr=on}}, {{convert|38.43|in|abbr=on}} overall length, and produces between {{convert|1000|lbf|abbr=on}} and {{convert|1800|lbf|abbr=on}} static thrust. [[Thrust specific fuel consumption|Specific fuel consumption]] at {{convert|1200|lbf|abbr=on}} thrust (SLS, ISA) is understood to be {{convert|0.486|tsfc}}.
==Variants==
;* FJ33-1
;* FJ33-2
;* FJ33-3
;* FJ33-4-A11
;* FJ33-4
;* FJ33-4-17M
;* FJ33-4-18M
;* FJ33-4A-19
;* FJ33-5A
;* Jahesh-700
Iran apparently reverse engineered a variant, and is using it as high endurance UAV powerplant.<ref>{{Cite web |title=Iran Flaunts New Missile and Jet Engine Technology |url=https://www.washingtoninstitute.org/policy-analysis/iran-flaunts-new-missile-and-jet-engine-technology |access-date=2022-06-10 |website=The Washington Institute |language=en}}</ref><ref>{{Cite web |title=Iran's 1st turbofan engine: Jahesh-700 |url=http://iranpress.com/content/59262/iran-1st-turbofan-engine-jahesh-700 |access-date=2022-06-10 |website=iranpress.com |language=en}}</ref>
==Applications==
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* [[Epic Elite]]
* [[Flaris LAR01]]
* [[Kratos XQ-58 Valkyrie]]
* [[Spectrum S-33 Independence]]
* [[Sport Jet II]]
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|diameter= {{convert|18.36|in|abbr=on}},
|weight= less than {{convert|300|lb|abbr=on}}
|compressor= 2 spool, 1-stage fan and 3-stage LP axial, 1 centrifugal
|combustion=
|turbine= 2 spool, 1 HP and 2 LP
|fueltype=
|oilsystem=
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