The Clean Sky initiative combines research and practical experience to improve (Clean Sky, 2013):
• Smart Fixed Wing Aircraft: active wing technologies and new aircraft configurations;
• Green Regional Aircraft: low-weight aircraft using smart structures, and low external noise configurations;
• Green Rotor craft: innovative rotor blades and engine installation for noise reduction, lower air frame drag, integration of diesel engine technology and advanced electrical systems to eliminate noxious hydraulic fluids, and reduce fuel consumption;
• Sustainable and Green Engines: engine demonstrators integrating technologies for low noise and lightweight low pressure systems, high efficiency, low NOx and low weight cores and novel configurations, such as open rotors and inter coolers.