A ball drive assembly for a vertical takeoff and land aircraft of the type having a plurality of supports extending outwardly from a central aircraft body. The ball drive assembly for one of the supports has a ball wheel housing containing a spherical, rigid ball, a drive shaft extending into the ball, a first driver for initiating rotating movement of the ball with respect to the ball wheel housing, and a second driver for initiating swiveling left and right movement of the ball so that it twists laterally of the ball wheel housing. Two motors are connected to the drivers, for operating them to rotate the ball with respect to the ball wheel housing, and effect both straight line movement and turning movement of the assembly.
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