HELICOPTER = (takeoff -> FLYING),
FLYING     = (hover -> HOVERING | land -> HELICOPTER),
HOVERING   = (resume -> FLYING).

animation HELICOPTER = "xml\copter_track.xml" 
              actions {
                takeoff/flight.start,
                hover/flight.hover,
                resume/flight.resume
              }
              controls{
                land /flight.landed,
                takeoff/takeoff,
                hover/hover,
                resume/resume
              }
