Abstract: An impeller is disclosed including a number of vanes, first and second coaxial disks formed from composite material on opposite sides of the vanes to fix the vanes in position, so that the impeller can rotate on an axis of rotation, and at least one reinforcing collar disposed coaxially with and adjacent to the axis of rotation to provide an interior collar, the at least one reinforcing collar comprising reinforcing fibers, such as carbon fibers.

Abstract: Apparatus is disclosed for the production of a levitational wind comprising a flight chamber defining a levitation area, a blower unit including a plurality of blowers connected in parallel so as to provide their combined flow to the air inlet of the flight chamber, each of the blowers being disposed outside of the levitation area, with the blower unit having an axis essentially perpendicular to the vertical axis of the flight chamber, and an air coupler interposed between the air inlet of the flight chamber and the blower unit, the air coupler including a substantially 90° bend between the blower unit and the air inlet of the flight chamber, and wherein each of the plurality of blowers includes a delivery element for removable connection to the air coupler.

Abstract: A moving-weight, dynamic balancing apparatus for a rotary machine, in particular an industrial fan, having a rotary shaft, and at least one rotor carried by the rotary shaft and provided with main rotor bearings to allow rotary movement thereof. The balancing apparatus includes at least one moving-weight balancing unit is carried by the rotary shaft, and at least one monitoring and correcting system having a drive assembly. The at least one monitoring and correcting system monitors and corrects the unbalanced state of the rotor, and acts continuously on the at least one moving-weight balancing unit when the rotor is rotating to monitor and correct for rotor unbalance. The at least one moving-weight balancing unit has at least two balancing masses mounted to be movable under drive from the drive assembly controlled by the monitoring and correction system.