ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,253, issued on Dec. 30, was assigned to EFIX AVIATION LTD (Kadima, Israel).
"Rotor system" was invented by Efraim Kastiel (Tel Aviv, Israel).
According to the abstract* released by the U.S. Patent & Trademark Office: "Rotorcraft including a fuselage and at least three rotor system arms each having a rotor system. Each rotor system includes a mast having at least two rotor blades and an electric rotor motor. At least one rotor system arm includes a support mechanism for pivotally supporting a floating mast about at least one pivot axis whereby the floating mast is tillable relative to a fiducial tilt position. The floating mast has a controllable cyclic rotor blade pitch. A mast t...