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General Electric J47
1948 - 1956



The J47 turbojet engine was one of first high-performance model, developed for military aircraft by General Electric from the J35 engine, as well as it was also the first axial-flow turbojet approved for civil aviation in the United States. Its modern construction scheme features a multi-stage axial-flow compressor, rather than a centrifugal compressor like the British turbojet engine of that period. The J47 was manufactured in various series between 1948 and 1956, for a total production of over 30000 units. Over the years it underwent constant development with considerable improvements in terms of power, reliability, and time between overhauls, which was greatly increased from 15 flight hours in 1948 to 1200 in 1956. The J47 was used in various aircraft, including the North American F-86 Sabre and the Convair B-36 Peacemaker. The engine was also produced under license by FIAT for the F-86 Sabre of the Italian Air Force, becoming the first turbojet aircraft used by its aerobatic demonstration team “Frecce Tricolori” in 1961.

Technical specifications

ManufacturerGE Aviation, General Electric, Massachussets, USA, from 1948 to 1956
Descriptionturbojet engine
Compressor12-stage axial flow
Compression ratio5.0
Airflow42 kg/s at 7950 rpm at sea level, in static conditions
Combustor8 tubular direct-flow inter-connected chambers, steel-sheet made
Turbineaxial single-stage type; distributor with 64 internally cooled vanes; SAE 4340 steel-made impeller core with an outer welded ring in Timken 16-25-6 alloy, in which 96 blades are inserted with sawtooth connection; inlet turbine gas temperature 870 °C, outlet temperature 690 °C at 7950 rpm
Ejectorfixed geometry propelling nozzle
Fuel feeding systemdouble fuel system with two gear pumps Pesco 2P-739-F, equipped with a barometric control system and a Pesco system for water injection in the combustion chambers
Fueljet fuel
Lubrication systemforced by a feeding gear pump and 4 scavenge gear pumps, with an oil cooler integrated in the storage tank
Maximum static thrust23140 N at 7950 rpm, at sea level
Maximum continuous thrust21030 N at 7630 rpm, at see level in static conditions
Thrust in cruise condition16470 N at 7000 rpm, at sea level in static conditions
Fuel specific consumption1.05 kg/daN/h
Diameter933 mm
Length3662 mm
Mass1134 kg
Mass-to-thrust ratio0.49 kg/daN


North American F-86 Sabre (fighter)

North American B-45 Tornado (strategic bomber)

Martin XB-51 (bomber)

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