General Electric CF34

CF34
A CF34 installed on a Bombardier CRJ200
Type	Turbofan
National origin	United States
Manufacturer	General Electric
First run	1982
Major applications	Bombardier Challenger 601/604/605 Bombardier Challenger 850 Bombardier CRJ Comac ARJ21 Embraer E-Jets
Developed from	General Electric TF34
Developed into	General Electric NG34

A CF34-8 mounted on the #2 (inner) pylon of GE's Boeing 747-100 flight test aircraft at Mojave Airport in 2002

CF34 engine mounted on an Embraer E-190

Recent versions of the CF34 feature chevrons on the core nozzle outlet.

The General Electric CF34 is a civilian turbofan developed by GE Aircraft Engines from its TF34 military engine. The CF34 is used on a number of jet airliners, including the Bombardier CRJ series, the Embraer E-Jets, and the Chinese ARJ21 under development. As of 2012, there are over 5,600 engines in service.

Design and development

The original engines comprise a single stage fan, driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage HP compressor, driven by a 2-stage high pressure (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 -10A and -10E, were derived from the CFM56 engine family, and have a radically different HP spool, comprising a 9-stage compressor driven by a single stage turbine. The LP spool has 3 core booster stages behind the fan. Static thrust is 82 kilonewtons (18,500 lbf) for the -10E variant.

Applications

CF34-1A

• Bombardier Challenger 601-1A

CF34-3A

• Bombardier Challenger 601-3A

CF34-3A1

• Bombardier Challenger 601-3R
• Bombardier CRJ100 ER/LR

CF34-3A2

• Bombardier Challenger 601-3A/ER

CF34-3B

• Bombardier Challenger 604
• Bombardier Challenger 605

CF34-3B1

• Bombardier Challenger 850
• Bombardier CRJ200 ER/LR
• Bombardier CRJ440 ER/LR

CF34-8C1

• Bombardier CRJ700 (Series 701)

CF34-8C5

• Bombardier CRJ700 (Series 705)
• Bombardier CRJ900
• Bombardier CRJ900 NextGen

CF34-8C5A1

• Bombardier CRJ1000 NextGen

CF34-8C5B1

• Bombardier CRJ700 NextGen

CF34-8E

• Embraer E-170
• Embraer E-175

CF34-10A

• Comac ARJ21

CF34-10E

• Embraer E-190
• Embraer E-195
• Embraer Lineage 1000

Specifications

	CF34-1	CF34-3	CF34-8	CF34-10
Length		103 in (2.6 m)	121.2 in (3.08 m) - 128 in (3.3 m)	90 in (2.3 m) - 145.5 in (3.70 m)
Diameter		49 in (1.2 m)	52 in (1.3 m) - 53.4 in (1.36 m)	57 in (1.4 m)
Dry weight		1,625 lb (737 kg) - 1,670 lb (760 kg)	2,408 lb (1,092 kg) - 2,600 lb (1,200 kg)	3,700 lb (1,700 kg)
Compressor		1 fan 14 HP stages	1 fan 10 HP stages	1 fan + 3 LP stages 9 HP stages
Turbine		4 LP stages 2 HP stages	4 LP stages 2 HP stages	4 LP stages 1 HP stage
Thrust at sea level		9,220 lbf (41.0 kN)	13,790 lbf (61.3 kN) - 14,510 lbf (64.5 kN)	18,285 lbf (81.34 kN) - 20,000 lbf (89 kN)
Thrust-to-weight ratio		5.6:1	5.3:1	5.2:1
Overall pressure ratio at max. power		21:1	28:1 - 28.5:1	29:1
Bypass ratio		6.2:1	5:1	5:1

See also

Related development

• General Electric TF34

Comparable engines

• PowerJet SaM146
• Progress D-436
• Pratt & Whitney PW6000
• Rolls-Royce BR700
• Rolls-Royce Tay (turbofan)

Related lists

• List of aircraft engines

External links

• General Electric CF34 page