thrusters / thrustors [ˈθrʌstɜrz]
thrusters – n. pl. of thruster – 1. people who aggressively push their way forward; 2. auxillary engines that can assist, alter or correct a flight path; 3. propellers on a drill ship or offshore rig used to maintain or manipulate the position
thrustors – n. – Trademark an hydraulic operating mechanism actuated by an electric motor