Pratt & Whitney TF33

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TF33

Contents

History

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.

Characteristics

  • 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)

Models

TF33-P-3

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

TF33-P-5

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

TF33-P-7

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.

TF33-P-9

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

TF33-P-11

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

TF33-P-100

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).

TF33-P-102

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).

TF33-P-103

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

Applications

External links

Sources

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