Abstract: During aircraft descent, flight control systems seek and maintain a glide slope determined from a single pilot input parameter; e.g., the position of a control axis of a flight stick. Appropriate guide slope selection by the pilot is readily determined from the pilot's visual observation of an intended landing site during landing approach. The glide slope defines a ratio of forward speed and descent speed which is automatically established and maintained/updated according to pilot input while these speeds are also automatically reduced during descent, despite the two speed directions respectively being affected distinctly and differently by aircraft mechanisms which control them. The aircraft ends its glide path with speed at or near zero, allowing landing by short vertical descent. Accordingly, the pilot offloads problems of both coordinating speeds to achieve a particular guide slope, and reducing them while maintaining this coordination.

Abstract: Stowing systems and methods to disassemble, store, and/or protect an aircraft, and in particular a VTOL aircraft, for transportation along standard public roadways. A stowing system attaches to the aircraft in a flight-ready state, and guides, supports, and/or stabilizes sub-assemblies of the aircraft as they are removed and moved into their stowed positions in preparation for transportation. In some embodiments, the stowing system is implemented as a trailer. The trailer, in some embodiments, is towable by car, such that the aircraft can be carried on and transported with the car and trailer by road. In some embodiments, the stowing system defines landing platform for the aircraft. It may provide facilities to help direct the aircraft to a precise location allowing support elements of the stowing system to be moved to engage with sub-assemblies of the aircraft along predefined degrees of freedom.

Abstract: Stowing systems and methods to disassemble, store, and/or protect an aircraft, and in particular a VTOL aircraft, for transportation along standard public roadways. A stowing system attaches to the aircraft in a flight-ready state, and guides, supports, and/or stabilizes sub-assemblies of the aircraft as they are removed and moved into their stowed positions in preparation for transportation. In some embodiments, the stowing system is implemented as a trailer. The trailer, in some embodiments, is towable by car, such that the aircraft can be carried on and transported with the car and trailer by road. In some embodiments, the stowing system defines landing platform for the aircraft. It may provide facilities to help direct the aircraft to a precise location allowing support elements of the stowing system to be moved to engage with sub-assemblies of the aircraft along predefined degrees of freedom.

Abstract: A VTOL aircraft comprising a plurality of motor assemblies, each configured to generate thrust by movement of air past the motor assembly along a respective axis of thrust of the motor assembly, and a wing, wherein 1) the orientations of the axes of thrust are each fixed, during operation of the aircraft, at a constant respective pitch angle oblique to a pitch orientation of the wing; 2) the plurality of motor assemblies is operable together to both fully support the aircraft in a hovering mode, and to propel the aircraft forward in a forward flight mode; 3) the wing does not intersect with any right cylinder centered on any motor assembly and having a central longitudinal axis aligned with the axis of thrust of the motor assembly, and having a radius equal to a radius of a propeller of the motor assembly.

Abstract: A VTOL aircraft comprising a plurality of motor assemblies, each configured to generate thrust by movement of air past the motor assembly along a respective axis of thrust of the motor assembly, and a wing, wherein 1) the orientations of the axes of thrust are each fixed, during operation of the aircraft, at a constant respective pitch angle oblique to a pitch orientation of the wing; 2) the plurality of motor assemblies is operable together to both fully support the aircraft in a hovering mode, and to propel the aircraft forward in a forward flight mode; 3) the wing does not intersect with any right cylinder centered on any motor assembly and having a central longitudinal axis aligned with the axis of thrust of the motor assembly, and having a radius equal to a radius of a propeller of the motor assembly.

Abstract: A VTOL aircraft comprising a plurality of motor assemblies, each configured to generate thrust by movement of air past the motor assembly along a respective axis of thrust of the motor assembly, and a wing, wherein 1) the orientations of the axes of thrust are each fixed, during operation of the aircraft, at a constant respective pitch angle oblique to a pitch orientation of the wing; 2) the plurality of motor assemblies is operable together to both fully support the aircraft in a hovering mode, and to propel the aircraft forward in a forward flight mode; 3) the wing does not intersect with any right cylinder centered on any motor assembly and having a central longitudinal axis aligned with the axis of thrust of the motor assembly, and having a radius equal to a radius of a propeller of the motor assembly.

Abstract: A method of automatic roll control in a UAV includes adjusting UAV yaw, measuring UAV pitch, estimating UAV drag, and estimating UAV velocity from the drag. A system includes a processor and a memory including instructions to automatically control roll in the UAV responsive to UAV yaw adjustment. A method includes estimating velocity in the UAV.