General Electric T58

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General Electric T58 turboshaft.jpg
Type Turboshaft
National origin United States
Manufacturer GE Aviation
First run 1955
Major applications CH-46 Sea Knight
SH-2 Seasprite
SH-3 Sea King
Variants Rolls-Royce Gnome,
Inspection of a T58 engine before installation in a SH-3G Sea King helicopter

The General Electric T58 is an American turboshaft engine developed for helicopter use. First run in 1955, it remained in production until 1984, by which time some 6,300 units had been built. On July 1, 1959, it became the first turbine engine to gain FAA certification for civil helicopter use. The engine was license-built and further developed by de Havilland in the UK as the Gnome, and also manufactured by Alfa Romeo and the IHI Corporation.

Design and development[edit]

Development commenced with a 1953 US Navy requirement for a helicopter turboshaft to weigh under 400 lb (180 kg) while delivering 800 hp (600 kW). The engine General Electric eventually built weighed only 250 lb (110 kg) and delivered 1,050 hp (780 kW) and was soon ordered into production. First flight was on a modified Sikorsky HSS-1 in 1957, and civil certification for the CT58-100 variant was obtained two years later.[1]

The main production version of the engine was the T58-GE-10, developing 1,400 hp (1,044 kW). The most powerful version, the T58-GE-16, produces 1,870 hp (1,390 kW).[2]


1,325 hp (988 kW) (5 minutes)[3]
1,500 hp (1,100 kW) (5 minutes)[3]
1,350 hp (1,010 kW)[3]
1,350 hp (1,010 kW)[3]
1,400 hp (1,000 kW)[3]
1,870 hp (1,390 kW)[3]
1,500 hp (1,100 kW) (10 minutes)[3]
1,250 hp (930 kW)[3]
1,400 hp (1,000 kW)[3]
Rolls-Royce Gnome
Licenced production and development of the T58 in the United Kingdom.


Other Applications[edit]

Two T58s, converted to turbojets by the removal of the power turbines, were used as the engines on the Maverick TwinJet 1200.[4]

The Carroll Shelby turbine cars entered in the 1968 Indianapolis 500 race were powered by T58s.[5] The cars were found to be using variable inlets to get around the USAC regulations on the maximum allowable inlet size and were disqualified.

Turboshaft engines like the GE T58, Lycoming T53/T55 are also used to power high performance powerboats, such as aport and offshore vee, and catamaran hulls like the Skater "Jet Set" or Mystic Powerboats "My Way", water jet river racers like Unnatural Dissaster and hydroplanes. Some of these boats run in excess of 200 mph, despite them being open cockpit pleasure boats.


Specifications (T58-GE-8)[edit]

Data from [7][8]

General characteristics

  • Type: Free power turbine turboshaft
  • Length: 55 in (1,397 mm)
  • Diameter: 16 in (406 mm)
  • Dry weight: 285 lb (129 kg) without reduction gearbox, 391 lb (177 kg) with reduction gearbox


  • Compressor: 10 stage axial-flow compressor with variable inlet guide vanes + variable incidence stators in first three stages
  • Combustors: Annular combustion chamber with 16 burner nozzles on two manifolds
  • Turbine: 2x gas generator power turbine stages + 1x free power turbine stage
  • Fuel type: Aviation kerosene


See also[edit]

Related development
Related lists


  1. ^ Flying Magazine: 52. March 1960.  Missing or empty |title= (help)
  2. ^ [1][dead link]
  3. ^ a b c d e f g h i John W.R. Taylor, ed. (1988). Jane's All the World's Aircraft 1988-89. London: Jane's Information Group. ISBN 0 7106 0867 5. 
  4. ^ MiniJets Website Retrieved 28 June 2011
  5. ^ 'Rodger Ward's Indy 500 Preview; Will the Turbines Takeover?'
  6. ^ Engine Collection. NEAM. Retrieved on 2013-08-16.
  7. ^ "About the General Electric T58 (series) Turbine Engine". 
  8. ^ Taylor, John W.R. FRHistS. ARAeS (1962). Jane's All the World's Aircraft 1962-63. London: Sampson, Low, Marston & Co Ltd. 

External links[edit]