A new type of jet engine could revive supersonic air travel

Listen to this story. S ince the 1960s engineers around the world have been fiddling with a novel type of jet called a rotating detonation engine, but it has never got beyond the experimental stage. Earlier this year America’s Defence Advanced Research Projects Agency awarded a $29m contract to Raytheon, part of RTX, another big aerospace group, to develop an RDE called Gambit. Both engines would be used to propel missiles, overcoming the range and speed limitations of current propulsion systems, including rockets and existing types of jet engines. However, if the companies are successful in getting them to work, RDE s might have a much broader role in aviation—including the possibility of helping revive supersonic air travel.