However, previous inverted quadcopters always used collective pitch to control the thrust produced by the blades. Collective pitch on a quadcopter is much simpler than it is on the main rotor of ...

Solenoid valves control the flow of compressed air from the bottles to the nozzles, providing thrust to stabilize the roll and pitch axes. As there aren’t many off-the-shelf flight control ...

Ulstein Maritime Ltd. in Canada has developed a new version of its successful series of deck-mounted Z-drive thrusters, and has added another fixed pitch retractable thruster to its range.