A system includes multiple assembly modules and one or more connectors. Each assembly module includes at least one connection interface, and each connector includes two open ends adapted to fitting into the connection interfaces of the two assembly modules, respectively. Each connector is configured to mechanically and electrically connect two of the assembly modules via the respective connection interfaces of the two assembly modules. The assembly modules include at least a control module having a communication unit and a processor. The communication unit is configured to obtain a set of host instructions from one or more hosts. The processor is configured to generate a set of operation instructions for each assembly module based on at least the set of host instructions.

Systems, methods, and devices for propelling self-propelled movable objects are provided. In one aspect, a rotor assembly for a self-propelled movable object comprises: a hub comprising a first fastening feature; a drive shaft comprising a second fastening feature and directly coupled to the hub by a mating connection of the first and second fastening features, wherein the drive shaft is configured to cause rotation of the hub such that the mating connection of the first and second fastening features is tightened by the rotation; and a plurality of rotor blades coupled to the hub and configured to rotate therewith to generate a propulsive force.

The invention discloses a user-assembled quadrotor toy, comprises motor top covers, a PCB control board, a battery cover, a shell bottom cover, landing gears, a battery, a quadrotor mounting rack, motor bottom covers, motor bracket assemblies, motor assemblies and a shell top cover; wherein the four corners of the quadrotor mounting rack are fixedly connected with the motor bottom covers through supports; the motor bracket assemblies arc fixedly connected in the motor bottom cover through screws; each motor assembly is fixedly connected to the corresponding, motor bracket assembly; each motor bottom cover is fixedly connected with the corresponding motor top cover through a screw; and the quadrotor mounting rack is fixedly mounted inside a protective shell composed of the shell bottom cover and the shell top cover. The invention is simple in structure and strong in interestingness it's capable of enabling a user to either have fins and excitement.

A toy paper airplane conversion kit has a nose-piece with a combination capacitor mounting portion and nose clip connected to a rear, electric motor driven propellor unit by a lead receiving, square section conductor conduit which keys into a complementary socket of the motor mount, maintaining the rear propellor unit tilted upward. The nose-piece has a combination capacitor mount and nose clip with two paper-clamping, cantilever spring arms extending rearwardly in spaced-apart, coplanar, side-by-side relation under the capacitor mounting portion and having converging portions adjacent rear free ends and, a stubby, paper spreading, crease stuffing fin from the nose-piece, rearward of free ends of the springs. The capacitor mouth receiving a charging plug of a battery pack unit.

An aircraft body and a method of making an aircraft body are provided. In one embodiment, an aircraft body may be molded from a single layer of carbon fiber stock, producing curved sections of single layer molded carbon fiber by molding pliable carbon fiber stock, and heat curing the carbon fiber stock to form a rigid, molded wing section.

Systems, methods, and devices for propelling self-propelled movable objects are provided. In one aspect, a rotor assembly for a self-propelled movable object comprises: a hub comprising a first fastening feature; a drive shaft comprising a second fastening feature and directly coupled to the hub by a mating connection of the first and second fastening features, wherein the drive shaft is configured to cause rotation of the hub such that the mating connection of the first and second fastening features is tightened by the rotation; and a plurality of rotor blades coupled to the hub and configured to rotate therewith to generate a propulsive force.

A flat-stock aerial vehicle includes a body having a plurality of flat-stock sheets connected to one another, at least one motor, and at least three aerodynamic propulsors driven by the at least one motor. The aerodynamic propulsors can provide lifting thrust, pitch, yaw, and roll control in both helicopter-like hover flight and airplane-like translational flight.

Systems, devices and methods for model rocketry are provided. According to some aspects, new forms of model rocket nose cones, other model rocket components, and methods for their use, are provided. A new form of reversibly-divisible nose cone is provided, including a plurality of housing sections forming an interior payload section and, in some embodiments, including a locking mechanism(s) configured to hold the plurality of housing sections together during the initial phases of flight. In some embodiments, such a locking mechanism is unlocked, and the housing sections are separated, at least in part, in an ejection phase of model rocket flight. In some embodiments, such a locking mechanism is unlocked, at least in part, by increased air resistance and tension from shock cord(s) of a model rocket. Shock cord mounting arms are provided, including eyelet(s), mounted at an angle to a trailing surface of the nose cone.

A baseplate assembly, used with releasably coupleable playing pieces, includes a baseplate operably coupled to an image generating device. The baseplate includes a display region, having playing pieces coupling elements, and means for transmitting images generated by the image generating device to the display region. An image generating and playing-piece-interacting assembly includes a receptor operably coupled to an image generating device, having a display screen for generated images, including integrated visual and optically encoded message images, a playing piece at a location relative to the display screen having an optical display message sensor, and a messaging transponder. The optical display message sensor receives the generated images and generates a first signal at least partially based upon the optically encoded message image. The messaging transponder receives the first signal and generates and sends the receptor a second signal at least partially based thereon.

A baseplate assembly, used with releasably coupleable playing pieces, includes a baseplate operably coupled to an image generating device. The baseplate includes a display region, having playing pieces coupling elements, and means for transmitting images generated by the image generating device to the display region. An image generating and playing-piece-interacting assembly includes a receptor operably coupled to an image generating device, having a display screen for generated images, including integrated visual and optically encoded message images, a playing piece at a location relative to the display screen having an optical display message sensor, and a messaging transponder. The optical display message sensor receives the generated images and generates a first signal at least partially based upon the optically encoded message image. The messaging transponder receives the first signal and generates and sends the receptor a second signal at least partially based thereon.