Pratt & Whitney JT3D

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Pratt & Whitney JT3D / TF33
Type:	Turbofan engine
Design country:	United States
Manufacturer:	Pratt & Whitney
Production time:	1958 to 1985
Number of pieces:	approx. 8,600

The Pratt & Whitney JT3D (military name Pratt & Whitney TF33 ) is a twin-shaft turbofan engine from the US engine manufacturer Pratt & Whitney .

It is essentially based on the Pratt & Whitney JT3 , but the compressor has been modified in such a way that the first three stages of the compressor have been replaced by two new stages designed as a fan. This fan created a bypass flow around the core engine. The sidestream ratio was about 1.37. The compression ratio was 13.6: 1. An additional turbine was installed to power the larger fan. The compressor has a total of 2 fan and 13 compressor stages, the turbine has a total of 4 stages. The air throughput is a maximum of 204 kg / s.

A Boeing KC-135E with four TF33.

It was one of the first engines of this type after the Rolls-Royce Conway . The fan increased the thrust from about 55 kN of the output engine to about 80 kN. The prototype of the engine flew for the first time in 1958. By 1985, around 8,600 engines had been produced in total.

This engine became known through its use in the Boeing 707 , the Douglas DC-8 , the B-52H and various variants of the C-135 / KC-135 . The use on the Lockheed C-141 was less known . It is still in use today on the approx. 90 B-52Hs of the US Air Force and a few Chilean KC-135Es . In commercial air traffic, it was largely replaced by more modern types in the mid-1970s due to stricter noise regulations.

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