Rolls-Royce Spey

Spey
An RB.168 Mk 202 Spey as fitted to the F-4K Phantom
Type	Turbofan
Manufacturer	Rolls-Royce Limited
First run	1964
Major applications	AMX International AMX BAC One-Eleven Fokker F28 Fellowship Blackburn Buccaneer McDonnell Douglas F-4K/M Phantom Xi'an JH-7
Number built	2,768
Variants	Allison TF41
Developed into	Rolls-Royce RB.183 Tay Rolls-Royce Marine Spey

The Rolls-Royce Spey (company designations RB.163 and RB.168 and RB.183) is a low-bypass turbofan engine originally designed and manufactured by Rolls-Royce that has been in widespread service for over 40 years. A co-development version of the Spey between Rolls-Royce and Allison in the 1960s is the Allison TF41.

Intended for the smaller civilian jet airliner market when it was being designed in the late 1950s, the Spey concept was also used in various military engines, and later as a turboshaft engine for ships known as the Marine Spey, and even as the basis for a new civilian line, the Rolls-Royce RB.183 Tay.

Aviation versions of the base model Spey have accumulated over 50 million hours of flight time.^[1] In keeping with Rolls-Royce naming practices, the engine is named after the River Spey.