A private venture by Westland, based on the single main 5-blade rotor, gearbox, and hydraulic controls from the Sikorsky S-56 Mojave, Westland redesigned the fuselage using steel tube construction to create a medium sized troop and passenger carrying helicopter, witth tailwheel u/c. Up to 40 passengers were to be carried, with metal cladding for passenger role or open frame for utility/crane role.
First flown at Yeovil on 15 June 1958 (G-APLE), the prototype Westland Westminster was powered by two 2920shp Napier Eland E220 turboshafts. Two prototyprs were built.
After the type's appearance at the 1960 Farnborough Air show, it was cancelled in September of that year.
Engines: 2 x Napier Eland E.229A turboshaft, 2090kW
Rotor diameter: 21.95m
Max take-off weight: 14965kg
Empty weight: 10125kg
Max speed: 241km/h
Cruising speed: 184km/h
Hovering ceiling, IGE: 2750m