The TF33 (JT3D) is a turbofan version of the J57 turbojet. 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.

models

• JTD3-3: 18,000 lb (80.1 kN) thrust
• TF33-P-5: 18,000 lb (80.1 kN) thrust
• TF33-P-7: 21,000 lb (93.4 kN) thrust

specifications

• Turbofan
• bypass ratio: 1.4
• mass flow: 450 lbs/sec

used by

• Boeing KC-135 Stratotanker
• Boeing 707
• Douglas DC-8
• Lockheed C-141 Starlifter