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Tay/Verdon
	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

Rolls-Royce RB.44 Tay

Last updated April 01, 2025

The Rolls-Royce RB.44 Tay is 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]

Variants

RB.44 Tay: Rolls-Royce development engines only, no production.
Hispano-Suiza Tay 250: The Tay built under licence in France.^[3]
Hispano-Suiza Tay 250A: The Tay built under licence in France.^[3]
Hispano-Suiza Tay 250R: The Tay built under licence in France.^[3]
Hispano-Suiza Verdon 350: The Tay developed under licence in France.^[4]
Hispano-Suiza Verdon 370: The Tay developed under licence in France.^[4]
Pratt & Whitney J48: Main article: Pratt & Whitney J48
The Tay built and developed under licence in the United States.

Applications

Tay

Vickers 663 Tay Viscount

Verdon

Dassault Mystère IV

Specifications (Hispano-Suiza Verdon 350)

Data fromFlight.^[5]

General characteristics

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

Components

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

Performance

Maximum thrust: 7,710 lbf (34 kN) at 11,000 rpm
Overall pressure ratio: 4.9
Air mass flow: 132 lb/s (60 kg/s)
Specific fuel consumption: 1.1 lb/(lbf h)
Thrust-to-weight ratio: 3.74

References

Notes

↑ Connors, p.202
↑ Gunston 2006, p.101.
1 2 3 Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 196–197.
1 2 Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 197–198.
↑ "Aero Engines 1956". Flight. 1956. Retrieved 8 January 2013.

Bibliography

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. ISBN 0-7509-4479-X.
Kay, Anthony L. (2007). Turbojet History and Development 1930-1960. Vol. 1 (1st ed.). Ramsbury: The Crowood Press. ISBN 978-1-86126-912-6.
"Aero Engines 1956". Flight. 1956. Retrieved 8 January 2013.

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[Connors,_p.202-1] Connors, p.202

[2] Gunston 2006, p.101.

[AEotW57-3] 1 2 3 Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 196–197.

[AEotW57(2)-4] 1 2 Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 197–198.

[Flight-5] "Aero Engines 1956". Flight. 1956. Retrieved 8 January 2013.

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v t e Hispano-Suiza aircraft engines
Piston engines	6 8 9V 12M 12N 12X 12Y 12Z 14AA 14AB 18R 18S
Turbojets	Verdon