An optical disk device includes a feed gear that engages a rack portion integrally formed with an optical pickup, a tray gear used for vertically moving a turntable and moving a disk tray, and a motor as a common driving source. By removing material, a cutting flute with a cutting edge, cutting surface and collector surface may be formed. A rotor mast joint connecting the rotor mast to a fuselage or wing of the aircraft permits the rotor mast to tilt relative to the fuselage or wing in at least one plane.