Lycoming T55

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"T55" redirects here. For the American utility carrier prototype see M50 Ontos, and for the Soviet tank, see T-54/55.
T55
Lycoming T55-GA-712.jpg
T55-GA-714A turboshaft engine on a CH-47 Chinook
Type Turboshaft
National origin United States
Manufacturer Lycoming Engines
Honeywell Aerospace
First run 1950s
Major applications CH-47 Chinook
Bell 309
Piper PA-48 Enforcer
Number built 4,200+
Developed from Lycoming T53
Developed into Lycoming/Vericor TF40

The Lycoming T55 (Company designation Lycoming LTC-4) is a turboshaft engine used on American helicopters and fixed-wing aircraft (in turboprop form), since the 1950s. It was designed at the Lycoming Turbine Engine Division in Stratford, Connecticut as a scaled-up version of the smaller Lycoming T53. Both engines are now produced by Honeywell Aerospace. The T55 also serves as the core of the Lycoming ALF 502 turbofan. Since the T55 was first developed, progressive increases in airflow, overall pressure ratio and turbine inlet temperature have more than tripled the power output of the engine.[1][2][3]

Variants[edit]

LTC4A-1
1,651 eshp (1,232kW)
LTC4B-8D
2,970 shp (2,216 kW)
LTC4B-12
4,600 shp (3,432 kW)
T5508D
2,930 shp (2,186 kW):Commercial version of the LTC4-8D
AL5512
4,200 shp (3,133 kW)
T55-L-5
2,200 shp (1,641 kW)
T55-L-7
2,650 shp (1,977 kW)
T55-L-9
2,595 eshp (1,936 kW)
T55-L-11
3,750 shp ( 2,798 kW)
T55-L-712
3,750 shp ( 2,798 kW)
T55-L-714
4,110 shp (3,066 kW)
T55-L-714A
4,867 shp (3,631 kW)
T55-GA-715
6,500 shp (4,849 kW):variable vane control : under development.

Applications[edit]

Specifications (T55-L-714A)[edit]

General characteristics

  • Type: Turboshaft
  • Length: 1,196.3 mm (47.1 inches)
  • Diameter: 615.9 mm (24.3 inches)
  • Dry weight: 377kg (831 lbs)

Components

Performance

See also[edit]

Comparable engines
Related lists

References[edit]

  • Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. p. 132. ISBN 0-7509-4479-X. 

External links[edit]