self-pro·pel·ling /-ˈpɛlɪŋ/
  self-propelling
       adj 1: containing within itself the means of propulsion or
              movement; "a self-propelled vehicle" [syn: automotive,
               self-propelled]
       2: moved forward by its own force or momentum; "a
          self-propelled egotist"; "the arms program is now
          self-propelled" [syn: self-propelled]