Honeywell T55

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T55
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.

Variants

LTC4

LTC4A

LTC4B-8

LTC4B-12

T5508D

Commercial version of the LTC4-8D

AL5512

T55-L-7

T55-L-9

T55-L-11

T55-L-712

T55-L-714

T55-L-714A

T55-GA-714

(GARRETT AIRESEARCH)

T55-GA-715

variable vane control : under development.

Applications

• Bell 309
• Boeing CH-47 Chinook
• Boeing Chinook (UK variants)
• Boeing Model 360
• Boeing RC-135- One T55 was fitted to the RC-135E derivative to provide power to the aircraft's phased array radar.
• Curtiss-Wright X-19
• North American YAT-28E Trojan
• Piper PA-48 Enforcer
• H1 Unlimited hydroplane
• Maytag [ Maxima XL (front load)]

Specifications (T55-L-714A)

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

• Compressor: 7-stage axial compressor and 1-stage centrifugal compressor
• Turbine: 2-stage gas producer and 2-stage free power

Performance

• Maximum thrust: As much as possible
• Overall pressure ratio: 9.32
• Turbine inlet temperature: 815C (power turbine inlet temperature)
• Power-to-weight ratio: (4,867 shp / 831 lbs) ~ 5.8568:1 shp/lb

See also

Comparable engines

• Allison T56
• Bristol Proteus
• Napier Eland
• Rolls-Royce Tyne

Related lists

• List of aircraft engines

References

• 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. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)

External links

• Honeywell T55 page