Systems and methods of detecting launch of a model rocket are described herein. A mechanically implemented launch accelerometer may be disposed on a model rocket. The launch accelerometer may detect acceleration of the rocket by a mass of the launch accelerometer moving relative to the rocket and against a spring force based on the rocket acceleration. The mass may comprise a first electrical contact that may contact a second electrical contact when the mass is accelerated beyond a threshold, which is indicative of launch of the rocket. The contact between the first electrical contact and the second electrical contact may complete an electrical circuit. Furthermore, at least one pin may lock the mass in a position allowing the electrical circuit to remain complete.

An unmanned aerial vehicle (UAV) includes a propeller, a driving device, and an elastic abutting member sleeve. The propeller includes a blade base, a blade mounted on the blade base, and a first installation foolproof member disposed on the blade base. The driving device includes a main body, a driving shaft rotatable relative to the main body, a locking member disposed on the main body, and a second installation foolproof member disposed on the locking member. The driving device is coupled with the propeller. The elastic abutting member is coupled with the driving shaft and disposed between the main body and the blade base and abuts against the main body and the blade base.

A modular wing, adapted to be used on a flying device such as a toy airplane, drone, or other small fixed wing flying device, or form a part of a wind turbine or any other apparatus that requires a wing or blade, that is compatible with all block-based toy systems such as LEGO®, DECOOL® or KAZI®. The modular wing is comprised of a series of modular aerodynamic surfaces that may be suitable for manufacture by a low-cost method such as molding or additive manufacturing such as 3D printing, typically but not necessarily from plastic, to form wing sub elements which, when assembled together, form a wing or blade such as an airplane wing or turbine blade. The modular wing may comprise cambered or symmetric wing shapes. The modular wing may be used in a static display model fully flying aerodynamic aircraft, sailing hydrodynamic boat, or aerodynamic functioning turbine.

A modular wing, adapted to be used on a flying device such as a toy airplane, drone, or other small fixed wing flying device, or form a part of a wind turbine or any other apparatus that requires a wing or blade, that is compatible with all block-based toy systems such as LEGO®, DECOOL® or KAZI®. The modular wing is comprised of a series of modular aerodynamic surfaces that may be suitable for manufacture by a low-cost method such as molding or additive manufacturing such as 3D printing, typically but not necessarily from plastic, to form wing sub elements which, when assembled together, form a wing or blade such as an airplane wing or turbine blade. The modular wing may comprise cambered or symmetric wing shapes. The modular wing may be used in a static display model fully flying aerodynamic aircraft, sailing hydrodynamic boat, or aerodynamic functioning turbine.

Disclosed here are systems for detachable airframe components including detachable nose cones, propeller assemblies and motors. In some example embodiments, the assemblies include a nose cone with a connection receiver, a motor assembly with a rotatable section, where the rotatable section includes torque arms configured to secure with the nose cone connection receiver, and a propeller assembly, configured to connect to the nose cone.

A flying toy includes a chassis, a rotor and an elastic rope. The chassis has a first mass includes a first pair of wings extending therefrom. The rotor is rotatably connected to the chassis. The rotor has a second mass larger than the first mass of the chassis, and the rotor includes a second pair of wings extending therefrom. The elastic rope is positioned in the chassis and configured to pivotably couple the chassis to the rotor. The elastic rope is operative to impart a torque to the rotor.

An inflatable toy plane assembly is provided. The plane assembly includes inflatable wings, an inflatable fuselage, an inflatable empennage (tail area stabilizers), and/or other inflatable elements. Not all elements of the inflatable plane assembly are required to be inflatable, e.g., the wings may be inflatable, and the fuselage may not. The plane assembly preferably includes one or more valves to facilitate the inflating and deflating of the plane's inflatable elements. In use, the inflatable plane assembly is deflated for compact storage (e.g., rolled up) and subsequently inflated when preparing the assembly for flight. The plane includes detachable wings and/or detachable tail stabilizers that are detached for storage, and subsequently reattached to the plane's fuselage and inflated for use.

A holding and starting device for hydro-pneumatically driven aircrafts composed of a base body carrying a flange that can be connected to it, the flange furthermore merging into a hollow cylinder portion receiving at least one sealing ring, latches pivotable about a shaft, and having a latch engagement means for a locking ring of the aircraft, and a release ring rotatably mounted on the base body, so that a release of the locking ring of the aircraft can take place. The latches have an actuating surface, which surface causes a pivoting movement of the latches when a nozzle-like neck portion of the aircraft is put on. With or at a rotation of the release ring against pretension, stop ends of the latches move into a respective associated setoff or a respective associated recess, so that the latches release the locking ring for starting.

A rotary aircraft includes a cover, a driving shaft in the cover, an electric control board on the cover, and a flight assembly mounted on the driving shaft and coupled electrically with the electrical control board, a driving assemble mounted on the flight assembly and coupled electrically with the electrical control board, connected with the driving shaft and driving it to rotate so as to rotate the cover, and a light bar mounted on the cover and coupled electrically with the electrical control board, used for displaying a presetting pattern or text, which achieves enlightening education and improves enjoyment of the flight toy and satisfies the demands of the users.

An aeronautical vehicle that rights itself from an inverted state to an upright state has a self-righting frame assembly has a protrusion extending upwardly from a central vertical axis. The protrusion provides an initial instability to begin a self-righting process when the aeronautical vehicle is inverted on a surface. A propulsion system, such as rotor driven by a motor can be mounted in a central void of the self-righting frame assembly and oriented to provide a lifting force. A power supply is mounted in the central void of the self-righting frame assembly and operationally connected to the at least one rotor for rotatably powering the rotor. An electronics assembly is also mounted in the central void of the self-righting frame for receiving remote control commands and is communicatively interconnected to the power supply for remotely controlling the aeronautical vehicle to take off, to fly, and to land on a surface.