Abstract: A manned/unmanned, autotonomously or remotely directed, horizontal, or vertical take-off and landing (HOVTOL) aircraft. This air vehicle incorporates multiple vertical facing ducted fans (shrouded propellers) driven by at least one power plant. Control authority of said air vehicle when in vertical flight mode is maintained through varying and vectoring the thrust produced by said ducted fans. When in a conventional horizontal flight mode, the aircraft would rely on aerodynamic control surfaces. In one embodiment this air vehicle would have the ability to transition from vertical helicopter type flight to a conventional horizontal aircraft mode of flight and back again. In another embodiment, this aircraft would perform similar to a helicopter—using only its ducted fans to produce vertical lift and maneuver in three dimensions.

Abstract: A device used in a ducted fan (shrouded propeller or similar axial flow, air moving producer) that's positioned on or about the ducted fan so as to disrupt or distort the subsequent laminar airflow induced by said air moving producer. The said device would, when actuated rapidly and precisely increase or decrease proportionately the resultant net thrust/airflow without varying the fan/propellers RPM.