Napier Gazelle

The Napier Gazelle is a turboshaft helicopter engine that was manufactured by D. Napier & Son in the mid-1950s. In 1961 production was nominally transferred to a joint venture with Rolls-Royce called Napier Aero Engines Limited. But the venture closed two years later.

Variants

 * NGa.1:Emergency rating 1260 shp at 20,400 rpm, 1 hour rating 1100 shp at 19,800 rpm, Max continuous rating 920 shp at 19,000 rpm
 * NGa.2:Emergency rating 1650 shp at 20,400 rpm
 * NGa.2(R):
 * NGa.2 series 2:
 * NGa.3:Emergency rating 1800 shp at 20,400 rpm
 * NGa.4:Emergency rating 2000 shp at 20,400 rpm
 * NGa.13(R):
 * NGa.13 series 2:
 * NGa.18:
 * NGa.22:
 * Mk.101:
 * Mk.161:
 * Mk.162: (NGa.13 series 2)
 * Mk.165:
 * Gazelle 501:
 * Gazelle 503:
 * Gazelle 512:
 * Gazelle 514:
 * Gazelle E.219:

Applications
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.

Engines on display
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