Allison TF41


TF41 Spey
Allison TF41-A-1B engine.jpg
An Allison TF41-A-1B turbofan
Type Turbofan
Manufacturer Allison Engine Company / Rolls-Royce Limited
First run 1967
Major applications LTV A-7 Corsair II
Number built 1,440
Developed from Rolls-Royce Spey

The Allison TF41 (Company designations RB.168-62 and Model 912) is a low-bypass turbofan engine.

Design and development

The TF41 was jointly developed by Allison Engine Company and Rolls-Royce from the latter's RB.168-25R Spey.[1] Allison manufactured the TF41 under license, while Rolls-Royce supplied parts common to existing Speys.[2] The TF41 was developed for use in the LTV A-7D Corsair II for the USAF, and the US Navy's A-7E. Between 1968 and 1983, a total of 1,440 TF41s were delivered.[3]


A TF41 of a U.S. Navy A-7E-4-CV Corsair II (BuNo 156809).

Specifications (TF41-A-1)

Data from Flight.[4][5]

General characteristics

  • Type: Turbofan
  • Length: 114.5 in (2908.3 mm)
  • Diameter: 40 in (1016 mm)
  • Dry weight: 3,511 lb (1592.6 kg)


  • Compressor: Three-stage LP compressor, two-stage IP compressor (both driven by LP turbine),11-stage HP compressor
  • Combustors: Cannular combustor with ten flame tubes
  • Turbine: Two-stage LP, Two-stage HP


See also

Related development

Comparable engines

Related lists


  1. ^
  2. ^ TURBOFANS: A Survey of Current Airline Powerplants
  3. ^ Gunston, p. 9
  4. ^
  5. ^ "Archived copy". Archived from the original on 2018-02-21. Retrieved 2018-01-31.CS1 maint: archived copy as title (link)
  • Connors, Jack (2010). The Engines of Pratt & Whitney: A Technical History. Reston. Virginia: American Institute of Aeronautics and Astronautics. ISBN 978-1-60086-711-8.
  • Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. p. 9. ISBN 0-7509-4479-X.

External links

  • Spey page
  • TF41 page