propulsive

from WordNet (r) 3.0 (2006)

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}, {propulsive}]

from The Collaborative International Dictionary of English v.0.48

Propulsive \Pro*pul"sive\, a.
   Tending, or having power, to propel; driving on; urging.
   "[The] propulsive movement of the verse." --Coleridge.
   [1913 Webster]