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.

Details of Various Turbofans

Comparison Tables of Various Engines


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

Turbojet : Turboprops