Gazeller

The Aérospatiale Gazelle (company designations SA 340, SA 341 and SA 342) is a five-seat helicopter developed and initially produced by the French aircraft company Sud Aviation, and later by Aérospatiale. It is the first helicopter to feature a fenestron tail instead of a conventional tail rotor, as well as being the first helicopter to be adapted for single-pilot operations under instrument flight rules.

The Gazelle was developed during the 1960s as a successor to the Alouette II as well as to meet a French Army requirement for a new lightweight observation helicopter. The Gazelle is considerably larger than the preceding Alouette series, yet is still powered by a single Turbomeca Astazou turbine engine. Innovations in the design of the Gazelle, aside from the fenestron, included an emphasis on minimal maintenance requirements, the use of a articulated rotor system, (feather, drag and pitch hinges), and rotor blades manufactured with composite materials. The rotor blades took a considerable amount of time to develop. In February 1967, France and the United Kingdom inked a cooperation agreement, which would see Westland Aircraft produce the Gazelle on British soil and partner with Sud Aviation on future refinements and upgrades to the Gazelle. On 7 April 1967, the Gazelle performed its maiden flight.