A radio controlled (RC) vehicle includes a receiver configured to receive a radio frequency (RF) signal from a remote control device. The RF signal indicates command data in accordance with a first coordinate system. The command data includes yaw-velocity command data. The RC vehicle includes motion sensors configured to generate motion data. The RC vehicle includes a processor coupled to the motion sensors and to the receiver. The processor is configured to transform the command data into control data based on the motion data and in accordance with a second coordinate system from a perspective of the RC vehicle. The control data includes yaw-velocity control data. The yaw-velocity control data is related to the yaw-velocity command data. The RC vehicle includes control devices coupled to the processor and configured to control motion of the RC vehicle based on the control data.

Vertical take off and landing unmanned aerial vehicle (UAV) comprising a multi-propeller propulsion system (“the system”), an outer protective cage surrounding the system, an autonomous power source, a sensing system, and a control system. The sensing system has an orientation sensor and a displacement sensor. The system has at least two propellers spaced apart in a non-coaxial manner. The control system controls the flight or hovering of the UAV. The control system reverses thrust on at least one propeller distal from a point of contact with an obstacle while controlling a motor of a proximal propeller from the contact point to generate lift, the thrust of the distal and proximal propellers being controlled to exert lift on the UAV to counteract gravitational force thereon and apply a moment of rotation about said point of contact to stabilize the position of the UAV or to counteract torque resulting from inertia.

Embodiments disclosed herein present a spring system for use in a torque dependent rotor assembly designed to operate in resonance, where changes in applied torque controls the blade pitch angle and ultimately the movements of a rotary wing aircraft. More specifically, the present invention relates to a spring system used in such a rotor assembly where the stiffness of an associated spring member is allowed to vary in response to the torque applied from a motor to the assembly.

A radio controlled model rotorcraft implemented with features improving flight performance using increasing structural stability and increasing rotorcraft visibility and orientation awareness through the use of multifunctioning, configurable, and aesthetically pleasing components.

A propulsion system assembly includes a propeller, a motor configured to drive the propeller to rotate, and a locking mechanism configured to detachably lock the propeller to the motor. The propeller includes one of a first body and a second body. The motor includes another one of the first body and the second body. The locking mechanism includes a coupling member including a femoral position groove, a fastener configured to fix the coupling member to the second body, and a locking member configured to lock the first body to the coupling member and the second body. A bottom portion of the first body that contacts the coupling member includes a protruding rib configured to fit with the femoral position groove to restrain the first body from rotating relative to the coupling member.

The rotary wing drone comprises at least one rotor carried by a drone structure, wherein the drone structure comprises a drone body and at least one group of arms comprising a plurality of arms rotatably mounted on the drone body about the same axis of rotation, between a deployed position for flight and a folded position for transport.

An unmanned aerial vehicle (UAV) landing method includes detecting, via one or more visual sensors, a gesture or movement of an operator of a UAV; and controlling to decelerate, with aid of one or more processors and in response to the detected gesture or movement, one or more rotor blades of the UAV to cause the UAV to land autonomously.

A remote controller includes a remote controller body including a control device configured to receive a remote-control command. The remote controller further includes an antenna and a holding mechanism movably connected to two opposite sides of the remote controller body, respectively. The holding mechanism is configured to hold a mobile terminal. The remote controller further includes a connecting mechanism connected between the remote controller body and the holding mechanism and configured to enable the holding mechanism to move relative to the remote controller body to be in an extended state or in a contracted state.

An example system for racing aircraft systems includes: a plurality of autonomous synchronized unmanned aircraft systems configured to form a swarm at a race course through which the aircraft systems are to navigate; and a controller configured to be operatively coupled to at least one unmanned aircraft system of the swarm, the controller configured to control the swarm to form an element of the race course.

An archery arrow end includes a main body that has a first end and a second end. The main body defines a longitudinal axis. The archery arrow end includes a tip positioned at the first end. The tip has a blunt end. The archery arrow end includes an arrow shaft connector positioned at the second end. The arrow shaft connector is configured to be attached to an arrow shaft. The archery arrow end includes flexible wings that extend from the main body in a direction at least partially toward the second end. Each wing has a free end configured to move toward and away from the longitudinal axis.