Pratt & Whitney TF33

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The TF33 turbofan, civil designation JT3D, was derived from the JT3C turbojet, increasing air mass flow almost 2.5 times. The first two compressor stages of the cancelled J91/JT9 replaced the first three compressor stages of the J57, making it simple to modify existing turbojets with a kit. The conversion increased thrust by 35 percent and fuel consumption by 15-22 percent. The TF33 first flew in 1958 and was in production until 1985. About 8,600 were produced.


  • Data for TF33-P-100A
  • Compressor Stages: @
  • Combustion Chamber: @
  • Turbine Stages: @
  • Max Diameter: 1.373 m (54.06 inch)
  • Length: 3.607 m (142 inch)
  • Dry Weight: 2,173 kg (4,790 lb)
  • Pressure ratio: @ : 1
  • Mass flow: 450 lb/sec
  • Bypass ratio: 1.4
  • Thrust to weight ratio 7-8 : 1
  • Specific fuel consumption: 15.86 mg/Ns (0.56 lb/h/lb st)



Fitted to the B-52H. Rated at 75.6 kN (17,000 lb) thrust.


Fitted to the C-135B and derived variants. Rated at 80.1 kN (18,000 lb).


Company designation JT3D-8A, equipped with additional compression stage. Fitted to the Lockheed C-141 Starlifter and Boeing E-3 Sentry. Rated at 90.1 kN (20,255 lb) thrust, pressure ratio 15.6 : 1.


Fitted to the C-135C and derived variants, including the EC-135C Looking Glass.


Fitted to Martin WB-57F as TF33-P-11A. Rated at 71.2 kN (16,000 lb).


Company designation JT3D-8B, modified with additional accessory drives to cope with higher electric energy generation demands. Selected for the Boeing E-3 Sentry and TC-18E as TF33-P-100A. Rated at 93.4 kN (21,000 lb).


Designation for ex-civil JT3D engines (taken from surpluss civil airframes) to re-engine some KC-135As. Over 150 aircraft were modified and the former KC-135A were re-designated KC-135E. The TF33-P-102C is powering the Northrop Grumman (Boeing) E-8 J-Stars. Rated at 80.1 kN (18,010 lb).


Alternative designation for the TF33-P-3. Rated at 75.6 kN (16,995 lb).


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