Over 6000 fixed wing aircraft were built at Yeovil between 1915 and 1955.
With the end of the war meant that the large aircraft industry would have to adapt to peacetime needs. The board of Westland Aircraft decided that the future may lie with a totally different form of flying machine, the helicopter.
The first practical helicopters had appeared towards the end of the war in Germany and USA, one of the most successful American designers being Sikorsky. In 1946 Westland negotiated a long term agreement to build Sikorsky designs under licence, but they also made the bold policy decision to specialise in helicopter designs for the future.
Work started with the Sikorsky S-51, which was subjected to some re-design to become the Dragonfly, flying for the first time in 1948, in service with the Royal Navy and RAF by 1953. Success with the Dragonfly was repeated with the S-55 to become the Whirlwind and in 1958 the S-58 was re-engined with a gas turbine to become the Wessex.
The introduction of helicopters into the Royal Navy was to transform Naval Aviation. The use of helicopters equipped with dipping sonar superseded fixed wing aircraft in the anti-submarine role while helicopters brought a whole new dimension to search and rescue.
It must not be assumed that Westland simply built off the shelf designs under licence. In all cases the Westland versions were subject to re-design and incorporated many improvements. Later Whirlwinds were re-engined with gas-turbines and the Wessex included a very advanced autopilot, setting the highest standards in the anti-submarine role.
In 1960 the British aircraft industry underwent a major re-organisation. There were at the time over twenty aircraft manufacturers, all competing for a few orders. The government of the time made it clear that it could no longer support this situation.
The result was a period of re-organisation where many of the companies combined to form only two major aircraft manufacturing groups (The British Aircraft Corporation and the Hawker Siddeley Group), neither of which had retained any interest in rotorcraft. Because of its success in the helicopter business, Westland were well placed to take the lead for rotary winged aircraft, there followed a period when Westland acquired Bristol Helicopters, Fairey Aviation and Saunders-Roe to become Westland Helicopters, Britain's sole helicopter company with full order books for Wessex, Scout and Wasp.
The partnership with Sikorsky continued with the adoption of the SH-3D to produce the Sea King. At the same time the British forces requirement for a range of new helicopters was met by collaboration with the French company, Aerospatiale to produce three new designs, Puma, Gazelle and Lynx.
Westland were to take design leadership for the Lynx, while Aerospatiale were to be responsible for Puma and Gazelle. Both companies were to take part in the development and manufacture of all the aircraft. The Anglo-French Helicopter Package Deal represented a major step in the development of Westland within the European aircraft industry.
There followed a period of unprecedented prosperity for Westland, the Lynx was a great success, setting a new high standard for small ship operations with Westland becoming the world leader in this field. A substantial number of Pumas and Gazelles were on order for the British services, while Sea King was doing well in the export market.