General Electric CF34

{{Infobox aircraft begin

|name= CF34

|image= File:Canadair CL-600-2B19 Regional Jet CRJ-200LR, UTair Aviation AN2213397.jpg

|caption= A CF34 installed on a Bombardier CRJ200

}}

{{Infobox Aircraft Engine

|type= Turbofan

|national origin = United States

|manufacturer= GE Aviation

|first run= 1982[http://www.flightglobal.com/directory/searchresults.aspx?navigationItemId=382&manufacturerType=Engine&searchMode=manufacturer&Keyword=&Manufacturer=3150 GE Aviation] at flightglobal.com

|major applications= Bombardier CRJ
Comac C909
Embraer E-Jets

|number built =

|developed from = General Electric TF34

|developed into = General Electric Passport

|variants with their own articles =

}}

File:E-190 az motore.JPG]]

File:KLC E-190 PH-EXA 25sep14 LFBO-3.jpg on the core nozzle outlet.]]

The General Electric CF34 is a civilian high-bypass turbofan developed by GE Aviation from its TF34 military engine. The CF34 is used on a number of business and regional jets, including the Bombardier CRJ series, the Embraer E-Jets, and Comac ARJ21/C909.[http://www.aviationpros.com/article/10781818/turbine-technology-the-cf34-turns-20 The CF34] at aviationpros.com[http://www.aviationpros.com/press_release/10782919/ges-cf34-3-engines-celebrate-20-years-of-regional-jet-service GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service] at aviationpros.com In 2012, there were 5,600 engines in service.

Design and development

The original engine contained a single stage fan driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage high pressure (HP) compressor driven by a 2-stage HP turbine, with an annular combustor. Later higher thrust versions of the CF34 feature an advanced technology core, with only 10 HP compressor stages. Latest variants, the {{nowrap|-10A}} and {{nowrap|-10E}}, were derived from the CFM56 engine family,{{citation needed|date=July 2020}} and have a radically different HP spool, containing a 9-stage compressor driven by a single stage turbine. The LP spool has 3 core booster stages behind the fan. Static thrust is {{convert|18500|lbf|kN|disp=flip|}} for the {{nowrap|-10E}} variant.

On wing times can reach 14,000 hours, an overhaul costs over $1.5 million and a set of LLPs $2.1 million for a 25,000 cycle life.{{cite news |url= http://www.aircraftvaluenews.com/e190-values-start-to-take-note-of-e2-2/ |title= E190 Values Start to Take Note of E2 |publisher= Aircraft Value News |date= October 29, 2018}}

In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.{{cite magazine |url= http://archive.aviationweek.com/issue/19950213/#!&pid=70 |title= CF34-8C to power new regional jet |author= David Hughes |magazine= Aviation Week |date= Feb 13, 1995}}

GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines, {{cite web|url= https://www.geaviation.com/military/engines/b-52|access-date= June 25, 2020|title= Propulsion Hub & Engine Product | GE Aviation|archive-date= June 26, 2020|archive-url= https://web.archive.org/web/20200626043209/https://www.geaviation.com/military/engines/b-52|url-status= dead}} but the Rolls-Royce F130 was selected in September 2021{{cite web|url= https://www.rolls-royce.com/media/press-releases/2021/24-09-2021-rr-north-america-selected-to-power-the-b-52-commercial-engine-replacement-program.aspx|access-date= July 21, 2023|title= Rolls-Royce North America selected to power the B-52 Commercial Engine Replacement Program}} instead.

Applications

;CF34-1A

Bombardier Challenger 601-1A

;CF34-3A

;CF34-3B

;CF34-8C

;CF34-8E

;CF34-10A

Comac C909

;CF34-10E

Specifications

class="wikitable" style="text-align: center; font-size:100%; color:black" \|+ CF34 Engine Comparison{{cite web \|url= http://www.geaviation.com/commercial/engines/cf34/ \|title= The CF34 Engine \|publisher= GE Aviation}}
!CF34-3{{cite web \|url= https://www.geaviation.com/sites/default/files/datasheet-CF34-3.pdf \|title= CF34-3 turbofan engine \|publisher= GE Aviation}} !CF34-8C{{cite web \|url= https://www.geaviation.com/sites/default/files/datasheet-CF34-8C.pdf \|title= CF34-8C turbofan engine \|publisher= GE Aviation}} !CF34-8E{{cite web \|url= https://www.geaviation.com/sites/default/files/datasheet-CF34-8E.pdf \|title= CF34-8E turbofan engine \|publisher= GE Aviation}} !CF34-10A{{cite web \|url= https://www.geaviation.com/sites/default/files/datasheet-CF34-10A.pdf \|title= CF34-10A turbofan engine \|publisher= GE Aviation}} !CF34-10E{{cite web \|url= https://www.geaviation.com/sites/default/files/datasheet-CF34-10E.pdf \|title= CF34-10E turbofan engine \|publisher= GE Aviation}}
Application \|CL600/CRJ200 \|CRJ700/900/1000 \|E170/175 \|C909 \|E190/195
Length \|{{convert\|103\|in\|m\|abbr=on\|lk=on}} \|{{convert\|128\|in\|m\|abbr=on}} \|{{convert\|121\|in\|m\|abbr=on}} \|{{convert\|90\|in\|m\|abbr=on}} \|{{convert\|145\|in\|m\|abbr=on}}
Diameter \|{{convert\|49\|in\|m\|abbr=on}} \|{{convert\|52\|in\|m\|abbr=on}} \|{{convert\|53\|in\|m\|abbr=on}} \|{{convert\|57\|in\|m\|abbr=on}} \|{{convert\|57\|in\|m\|abbr=on}}
Dry weight \|{{convert\|1670\|lb\|kg\|abbr=on\|lk=on\|disp=br()}} \|{{convert\|2400
2450\|lb\|kg\|abbr=on\|disp=br()}} \|{{convert\|2600\|lb\|kg\|abbr=on\|disp=br()}} \|{{convert\|3700\|lb\|kg\|abbr=on\|disp=br()}} \|{{convert\|3700\|lb\|kg\|abbr=on\|disp=br()}}
Fan \| {{Convert\|44\|in\|cm\|abbr=on}} \|colspan=2\| {{Convert\|46.2\|in\|cm\|abbr=on}} \|colspan=2\| {{Convert\|53\|in\|cm\|abbr=on}}
Compressor \|14 {{Abbr\|HP\|high-pressure}} stages, 14:1 \|colspan=2\|10 HP stages \|colspan=2\|3 {{Abbr\|LP\|low-pressure}} + 9 {{Abbr\|HP\|high-pressure}} stages
Turbine \|colspan=3\|4 {{Abbr\|LP\|low-pressure}} + 2 {{Abbr\|HP\|high-pressure}} stages \|colspan=2\|4 LP + 1 HP stage
Thrust (SL) \|{{convert\|9220\|lbf\|kN\|abbr=on\|lk=on}} \|{{convert\|13790
14500\|lbf\|kN\|abbr=on}} \|{{convert\|14500\|lbf\|kN\|abbr=on}} \|{{convert\|17640\|lbf\|kN\|abbr=on}} \|{{convert\|20360\|lbf\|kN\|abbr=on}}
Thrust/weight \|5.52:1 \|5.7-6:1 \|5.6:1 \|5.1:1 \|5.2:1
OPR (max. power) \|21:1 \|28-28.5:1 \|28.5:1 \|colspan=2\|29:1
Bypass ratio \|6.2:1 \|colspan=3\|5:1 \|5.4:1
SFC (Cruise) \|{{convert\|0.69\|lb/lbf/h\|g/kN/s\|abbr=on\|lk=on\|disp=br()}} \|{{convert\|0.67
0.68\|lb/lbf/h\|g/kN/s\|abbr=on\|disp=br()}} \|{{convert\|0.68\|lb/lbf/h\|g/kN/s\|abbr=on\|disp=br()}} \|{{convert\|0.65\|lb/lbf/h\|g/kN/s\|abbr=on\|disp=br()}} \|{{convert\|0.64\|lb/lbf/h\|g/kN/s\|abbr=on\|disp=br()}}

class="wikitable" style="text-align: center; font-size:100%; color:black"

|+ CF34 Engine Comparison{{cite web |url= http://www.geaviation.com/commercial/engines/cf34/ |title= The CF34 Engine |publisher= GE Aviation}}

!CF34-3{{cite web |url= https://www.geaviation.com/sites/default/files/datasheet-CF34-3.pdf |title= CF34-3 turbofan engine |publisher= GE Aviation}}

!CF34-8C{{cite web |url= https://www.geaviation.com/sites/default/files/datasheet-CF34-8C.pdf |title= CF34-8C turbofan engine |publisher= GE Aviation}}

!CF34-8E{{cite web |url= https://www.geaviation.com/sites/default/files/datasheet-CF34-8E.pdf |title= CF34-8E turbofan engine |publisher= GE Aviation}}

!CF34-10A{{cite web |url= https://www.geaviation.com/sites/default/files/datasheet-CF34-10A.pdf |title= CF34-10A turbofan engine |publisher= GE Aviation}}

!CF34-10E{{cite web |url= https://www.geaviation.com/sites/default/files/datasheet-CF34-10E.pdf |title= CF34-10E turbofan engine |publisher= GE Aviation}}

Application

|E170/175

Length

|{{convert|103|in|m|abbr=on|lk=on}}

|{{convert|128|in|m|abbr=on}}

|{{convert|121|in|m|abbr=on}}

|{{convert|90|in|m|abbr=on}}

|{{convert|145|in|m|abbr=on}}