Napier: Eland
The Eland first flew in 1953 in a Vickers Varsity aircraft, followed in 1955 in the first production Airspeed Ambassador.
1961 the Napier Aero Engines Ltd was formed with Rolls-Royce Limited to make the Eland and Gazelle engines.
The Eland powered various aircraft, including the Westland Westminster helicopter, and the Canadair CL-66. It also powered two versions of the Convair CV-240 family of aircraft (the CV-540 and CC-109 Cosmopolitan)[1].
The Fairey Rotodyne had two Eland turboshaft engines, each rated at 2800 SHP. These drove controllable pitch propellors in forward flight. To drive the rotors for vertical take-off and landing, each engine drove a compressor via a clutch (fluid coupling), and each compressor supplied air to one pair of blade tip jets.
1962 Due to lack of orders production was halted[2]
For more information, see Wikipedia entry.