Patent ID: 9108728
Filing Date: 2015-08-18
Classification: B64C

Abstract:
1. A method of operating a flight vehicle having a plurality of propellers and an airframe, wherein the airframe has an airframe front and defines an airframe plane, comprising: positioning each of the plurality of propellers with a tilt angle of approximately zero with respect to the airframe plane; providing power to all of the plurality of motors, wherein the power is sufficient to lift the air vehicle off of the ground so the vehicle is airborne; with the vehicle airborne, maintaining or increasing power to a first propeller subset comprising one or more of the plurality of motors; with the vehicle airborne, reducing power to a second propeller subset comprising one or more of the plurality of motors, while simultaneously; with power reduced or eliminated to the second propeller subset, tilting one or more of the propellers of the second propeller subset forward with respect to the airframe front to a tilt angle of between 60 and 95 degrees; with the one or more of the propellers of the second propeller subset tilted forward with respect to the airframe front to a tilt angle of between 60 and 95 degrees, increasing power to the second propeller subset.