A ducted fan air vehicle and method of operation is disclosed for
obtaining aerodynamic lift and efficiency in forward flight operation
without significantly impacting hover stability. One or more retractable
wings are included on the ducted fan air vehicle and are deployed during
forward flight to provide aerodynamic lift. The wing or wings are
retracted when the vehicle hovers to reduce the impact the wings have on
stability in a wind. Each wing may conform to the curvature or profile of
the vehicle when retracted, and may be constructed in one or more wing
sections. The wing or wings may be deployed and retracted automatically
or at the command of an operator. Each wing and related components may be
integrated into the vehicle or may be detachable.