In 1961 production was nominally transferred to a joint venture with Rolls-Royce called Napier Aero Engines Limited.

[2] These helicopter engines were used on the Westland Wessex HAS 1 and HAS 3 (other versions of the Wessex had two Rolls-Royce Gnome engines) and the Bristol Belvedere (later Westland Belvedere) transport helicopter.

A preserved Napier Gazelle is on display at the Royal Air Force Museum London.

A preserved Napier Gazelle from a Westland Wessex helicopter is on display at the Queensland Air Museum, Caloundra, Australia.

A Napier Gazelle is on display at the South Yorkshire Aircraft Museum, Doncaster A further Napier Gazelle is displayed at the Solent Sky Museum, Southampton Data from Jane's All the World's Aircraft 1962-63 and Flightglobal archive.