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Turbofan Engines

Turbofan engines use the traditional jet scheme for some of their thrust, but much of it comes from a fan mounted on the shaft in front of the compressor. This fan is driven by the turbine. The fan duct surrounds the core engine.

Turbofan Basics
Properties of some example turbofans
Comparison tables

This section has yet to be written.

Click on the picture for more details on the workings of turbofan engines.

Allied Signal

ALF502 family

LF507 family

TFE731 family

Pratt & Whitney

F100 family

JT8D family

PW4000 family

Pratt & Whitney Canada

 PW Canada has a cool, well-illustrated tutorial on how jet engines work at this location.

JT15D

Rolls Royce

Trent family

RB211 family

EJ200

General Electric

GE90 family

CF34 family

F404 family

CFM (joint venture of GE and Snecma France)

CFM56 family

Comparison Charts

Bizjet and Regional Engines

Make Model Application Max thrust (lb) Cruise Thrust (lb) Cruise SFC (lb/hr/lb) Bypass Ratio Pressure Ratio Weight (lb)
Allied Signal ALF502-L3 Challenger 600 7,800 1,600 0.720 13.8 1,311 lb
LF507-1F Avro RJ 7,000 1620 0.700 13.8 1,385
TFE731-60 Falcon 900X 5000 1120 0.679 22 988
Pratt Canada JT15D-5D Citation Ultra 3045 13.1 627
GE CF34-8C1 CRJ-700 12,670 0.655 5 16.5 2335

Midsize Airliner Engines

Make Model Application Max thrust (lb) Cruise Thrust (lb) Cruise SFC (lb/hr/lb) Bypass Ratio Pressure Ratio Weight (lb)
Pratt & Whitney JT8D-17A 727, 737, DC-9 16,000 lb 0.96 16.9 3,475
CFM CFM56-7B18 737-600/700/800 18,500 5905 5.6 32.3 5216

Big airliner engines

Make Model Application Max thrust (lb) Cruise Thrust (lb) Cruise SFC (lb/hr/lb) Bypass Ratio Pressure Ratio Weight (lb)
Pratt & Whintey PW4462 767, MD-11 62,000 4.8 32.3 ~9,400
Rolls Royce Trent 800 777 75,000-104,000 6.5 42 13,100 lb
RB211-524G 747 58,000-60,600 4.3 25.8 9499
GE GE90-76B 777-100 76,900 40 16,644

Military Fighter Engines

Make Model Application Max thrust (lb) Cruise Thrust (lb) Cruise SFC (lb/hr/lb) Bypass Ratio Pressure Ratio Weight (lb)
Pratt & Whitney F100-229 F-15, F-16 29,100 17,800 0.35 32 3740
Rolls/Eurojet EJ200 Eurofighter 26,300 0.4 25 2180
GE F404/RM12 JAS 39 Gripen 18,100 0.34 27 2325