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The most unusual introduction at the NBAA gathering in New Orleans, maybe at any NBAA gathering, was made by AeroCopter. The Andover, Massachusetts, company announced the Humming, a unique aircraft that combines jet engines and helicopter aerodynamics to create a new kind of tiltrotor aircraft. A relatively traditionally configured delta-wing fuselage is encircled by one large tiltrotor (made of two concentric rings separated by eight blades) to which four jet engines are mounted on the outside of the outer ring. During vertical takeoff, the spinning tiltrotor is parallel to the fuselage but once sufficient altitude is reached the rotor is tilted so it is perpendicular to the fuselage to provide the thrust for forward flight.