Launching the A320 New Engine Option (A320neo) has given Airbus time in which to develop new technologies that could define future aircraft characteristics. These include “open rotor” engine applications that might offer “the Number 1 chance to reduce fuel burn until there is propulsion more efficient than the propeller.” Various ideas include high, rear-mounted engines driving 13.78 foot-diameter contra-rotating rotors. (Photo: Airbus)
