ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,420,918, issued on Sept. 23, was assigned to HAYMATT LLC (Phoenix).
"Rotor blade tracking wedge with porous elements" was invented by Michael J. McNulty (Scottsdale, Ariz.) and Robert T. Loftus (Gilbert, Ariz.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Rotor blades may be modified with field-installable profiles, or wedges towards the rear trailing end. The wedges may incorporate one or more porous sections to enhance fluid flow through the wedge, and thus reduce trailing edge noise and rotor vibrations when the rotors are in use. The use of porous materials on the trailing end of the blade and/or wedge reduces the intensity of high-frequency noise...