ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,459,639, issued on Nov. 4.
"Twin fan, redundantly configured vertical lift vehicle" was invented by David J. File (Carlsbad, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Improved aircraft, which may be configured as unmanned drones or piloted aircraft, having improved fail-operational performance. The aircraft includes a twin fan arrangement and innovative motor, propeller, driver and/or power source redundancies configured to provide fail-operational functioning in the event of failure of one or more of these aircraft components. In various optional features, the aircraft may be configured for vertical takeoff and landing. The disclosed embodim...