A prompt drop device for a remote control model airplane comprises an airplane body (1) and a horizontal tail (3). A support (2) disposed on the airplane body (1) is used for supporting the front end of the horizontal tail (3). The front end (8) of the horizontal tail (3) is rotated under the binding of the support (2). A driving device is connected with the horizontal tail (3) and is used for lifting the rear end of the horizontal tail (3). A remote control model airplane comprising the prompt drop device is provided with the movable horizontal tail (3) and controls the angle of the horizontal tail (3) during landing, so that vertical descending is realized, and damage during landing is avoided.

A system includes a first terminal and a second terminal. The first terminal is configured to communicate with a controlled terminal via a first communication link. The second terminal is configured to communicate with the controlled terminal via a second communication link and communicate with the first terminal via a third communication link. The second terminal is further configured to relay data between the first terminal and the controlled terminal via the second communication link and the third communication link.

Toy aircraft comprise a fuselage and a main wing coupled to the fuselage. The main wing is configured to be bent and/or twisted at any position along a substantial span-wise length of the main wing amongst a plurality of distinct wing configurations and the main wing is configured to be retained in a selected one of the plurality of distinct wing configurations. In some examples, the main wing comprises an external body and a malleable frame that is supported by the external body. The malleable frame is configured to be selectively bent and/or twisted at any position span-wise along the malleable frame amongst a plurality of distinct wing configurations and the malleable frame is configured to retain the main wing in a selected one of the plurality of distinct wing configurations. The external body is configured to be pliable to conform to the selected one of the distinct wing configurations.

An attachable handheld fidget spinner is provided. The spinner comprises a wing portion comprising a cavity and a blade, the blade having a proximal end near the cavity and a distal end away from the cavity, the blade having an increasing depth and an increasing width from the proximal end toward the distal end; and a core disposed inside the cavity, the core comprising a cylindrical disc, the cylindrical disc comprising a holding surface disposed at the center of the cylindrical disc; an outer ring surrounded the holding surface; and a core groove in between the holding surface and the outer ring, the outer ring comprising protrusions facing the core groove, the protrusions configured to removably attach to an object. The attachable handheld fidget spinner kit and methods of using the kit are disclosed.

An all-metal airplane model includes a fuselage, wings, a tail wing, and a power control system, where the power control system is mounted in a wing platform, and the fuselage, the wing, the wing platform and the tail wing are all made of aluminum foil; an end portion of the wing and an end portion of the tail wing each are provided with an end wing structure made of a plastic film; a head of the fuselage, a head of the wing platform or a tail of the wing platform may be provided with a propeller; the tail wing includes a horizontal elevator group mounted at a tail of the fuselage and a vertical steering rudder group mounted above the horizontal elevator group, and the horizontal elevator group and the vertical steering rudder group are both made of aluminum foil.

A radio controlled (RC) vehicle includes a receiver that is coupled to receive an RF signal from a remote control device, the RF signal containing command data in accordance with a first coordinate system, wherein the first coordinate system is from a perspective of the remote control device. A motion sensing module generates motion data based on the motion of the RC vehicle. A processing module transforms the command data into control data in accordance with a second coordinate system, wherein the second coordinate system is from a perspective of the RC vehicle. A plurality of control devices control the motion of the RC vehicle based on the control data.