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performance calculations for the Pratt & Whitney JT9D-7A aircraft engine

Pratt & Whitney JT9D-7 turbofan at the Deutsches Museum Munchen

JT9D engine on display at the Deutsches Museum Munchen

Pratt & Whitney JT9D-7A turbofan engine of 208.9 [KN] (46962 [lbf]) thrust

introduction : 1975 country : us importance : ok

applications : Boeing 747SP

max. rating (take-off) : 208.9 [KN] (46962 [lbf], 21302 [kgf])

weight engine(s) dry : 4030.0 [kg] = 51.84 [N/kg]

General information :

The Pratt & Whitney JT9D engine was the first high bypass ratio jet engine to

power a wide-body airliner . Production ended in 1990, to be replaced by the PW4000.

by-pass ratio : 4.80 : 1

overall pressure ratio (OPR) : 26.7 : 1

noise category : MCC3 (marginally complaint chapter 3)

TO-noise level : 106.4 [EPNdB]

rpm LP : 3750 [rpm]

rpm HP : 8000 [rpm]

axial flow engine

water-injection to boost take-off power

Pratt & Whitney JT9D-7 turbofan cross section with internal pressures and temperatures

arrangement : 1 Fan followed by :

LP compressor stages : 3 [ ]

HP compressor stages : 11 [ ]

HP turbine stages : 2 [ ]

LP turbine stages : 4 [ ]

stages : 1 + 3 + 11 + 2 + 4

turbine inlet temperature : 0 [K]

fan diameter : 234.0 [cm] engine diameter : 243.0 [cm]

air mass flow : 424 [kg/s]

airflow/fan area : 0.38 [kg/m2/s]

Vjet at take-off brake-release : 1774.16 [km/h]

design hours : 1250 [hr] time between overhaul : 13646 [hr]

estimated specific fuel consumption (cruise power) :60.0 [kg/KNh]

Pratt & Whitney JT9D-7 turbofan under the wing of an Air France Boeing 747

Pratt & Whitney JT9D-7 turbofan engine exhaust (c) bvdz

Literature :

confidence rating regarding source data : medium - all information is only available from news, social media or unofficial sources

DISCLAIMER Above calculations are based on published data, they must be

regarded as indication not as facts.

Calculated performance and weight may not correspond with actual weights

and performances and are assumptions for which no responsibility can be taken.

Calculations are as accurate as possible, they can be fine-tuned when more data

is available, you are welcome to give suggestions and additional information

so we can improve our program. For copyright on drawings/photographs/

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