pro·pul·sive /-ˈpʌlsɪv/
  (a.)推進的,有推進力的
  Pro·pul·sive a. Tending, or having power, to propel; driving on; urging. “[The] propulsive movement of the verse.”
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  propulsive
       adj 1: having the power to propel; "propulsive coefficient"
       2: tending to or capable of propelling; "propellant fuel for
          submarines"; "the faster a jet plane goes the greater its
          propulsive efficiency"; "universities...the seats of
          propulsive thought" [syn: propellant, propellent, propelling]