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breakthrough not just in fuel burn, but more importantly by delivering radically improved environmental performance through reduced emissions of CO2. Consequently, as noted earlier the open rotor concept is making a comeback. It is one of five engine types currently being developed and evaluated as part of the EU’s Clean Sky’s sustainable green engine (SAGE) programme. Taking the lead is the French engine manufacturer, Snecma, working in collaboration with Airbus. As part of the programme designated SAGE 2 under Clean Sky, the Geared Open Rotor Demonstrator project is evaluating the feasibility and the environmental benefits of an open rotor propulsion system. According to Vincent Garnier, Snecma’s director of product strategy and marketing (Dubois, 2014), the technology demonstrator programme they are leading as part of Clean Sky has three main goals: to evaluate and validate the open rotor architecture to push the science and technology of all the main components of the propulsion system to build a team of partners The open rotor architecture being evaluated is similar to that employed by General Electric during the 1980s. However since then material science has made many advances and among the new technologies now being evaluated is a ceramic-matrix composite (CMC) used for airfoils in the low pressure (LP) turbine. CMC produces airfoils that are 70 per cent lighter than conventional airfoils and yield a lighter disk overall (Dubois, 2014). A feature of technology demonstrator programmes is that they provide an opportunity for firms to work together as partners on a project. To date the partners in this particular SAGE programme include Italy’s Avio Aero, Britain’s GKN Aerospace and France’s Aircelle (part of Safran) along with Snecma (Eshel, 2014) the firm leading the project. Each of these partners is a specialist in its field. For example Avio Aero specializes in gearboxes, while GKN Aerospace which is providing the majority of the engine’s rotating module (Reals, 2016) which includes the rotors themselves, specializes in composite aerostructures including things like helicopter blades. The technology demonstrator programme began with Snecma testing a one fifth scale model of a contra-rotating open rotor (CROR) design. These tests were carried out at the French research 9PDF Image | Sustainable and Green Engine (SAGE) Aircraft Engine of the Future
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