See Laser propulsion, Photonic Laser Thruster, Photon rocket. An azimuth thruster in shipbuilding is a propeller that can be rotated horizontally. NO/hydrazine thruster using a pintle injector. It was similar to a gridded electrostatic ion thruster and used mercury for propellant. Each Draco thruster generates of thrust. Some nozzles are intangible, such as the electromagnetic field nozzle of a vectored ion thruster. Examples include the outboard motor, the bow thruster, and the Z-drive. VASIMR is a type of electrothermal plasma thruster/electrothermal magnetoplasma thruster. This is augmented by a direct jet thruster and vertical stabilisers. Specifically, it is an azimuth thruster. Hughes (EDD) manufactured the NSTAR thruster used on the spacecraft. In 1969, the ship's maneuverability was improved by the installation of a diesel-powered bow thruster. These, coupled with a bow thruster, make the ship exceptionally maneuverable. An option similar to the Azimuth thruster used on the ships was also considered. This virtual cathode then attracts the ions formed inside the thruster closer to the anode.