Rolls-Royce RB.44 Tay

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Hispano-Suiza Verdon 253A - MAA (2).JPG
A Hispano-Suiza Verdon which powered the Dassault Mystere IV, displayed at the Ailes Anciennes Toulouse.
Type Turbojet
Manufacturer Rolls-Royce Limited
Major applications Dassault Mystère IV
Developed from Rolls-Royce Nene
Variants Pratt & Whitney J48

The Rolls-Royce RB.44 Tay was a British turbojet engine of the 1940s, an enlarged version of the Rolls-Royce Nene designed at the request of Pratt & Whitney.[1] It saw no use by British production aircraft but the design was licence built by Pratt & Whitney as the J48, and by Hispano-Suiza as the Verdon.[2]

Two early production examples of the Tay were evaluated during 1950 by the Royal Aircraft Establishment (RAE) at Farnborough Airfield, Hampshire, in a specially modified Vickers Viscount.


RB.44 Tay
Rolls-Royce development engines only, no production.
Hispano-Suiza Verdon
The Tay built and developed under licence in France.
Pratt & Whitney J48
The Tay built and developed under licence in the United States.


Two early Tay engines under test in 1950 by the RAE in a Vickers Viscount

Specifications (Hispano-Suiza Verdon 350)[edit]

Data from Flight.[3]

General characteristics

  • Type: Turbojet
  • Length: 103.2 in (2,621 mm)
  • Diameter: 50 in (1,270 mm)
  • Dry weight: 2,061 lb (935 kg)


  • Compressor: Double sided centrifugal compressor
  • Combustors: Nine tubular combustion chambers
  • Turbine: Single-stage turbine
  • Fuel type: AVTUR / JET-A1 / F-34 etc.
  • Oil system: Pressure spray lubricated with scavenging


See also[edit]

Related development
Related lists


  1. ^ Connors, p.202
  2. ^ Gunston 2006, p.101.
  3. ^ "Aero Engines 1956". Flight. 1956. Retrieved 8 January 2013.