Abstract: There is provided, in accordance with an aspect of some embodiments of the invention, a flight system including an airframe having a longitudinal axis, and a rotor sub-system mounted on the airframe and including a plurality of rotors coupled to at least one secondary axle, the secondary axle configured to: (a) pivot and pitch in respect to the airframe about an axis perpendicular to the longitudinal axis of the airframe, and (b) pivot and roll in respect to the airframe about an axis parallel to the longitudinal axis of the airframe, while maintaining a spatial orientation of the airframe. The flight system may also comprise an airfoil moveable from a passive mode to an active mode.

Abstract: Apparatus for restricting magnetic oil to a desired location within a FFFB comprising selectably locatable stopper apparatus having a first location near the FFFB for enabling a vacuum to be produced and for restricting the magnetic oil within the FFFB during filling of the FFFB with the magnetic oil and a second location away from the FFFB when filling is not occurring and apparatus for moving the selectably locatable stopper apparatus between the first location and the second location.