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 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 coupling element for releasably connecting two building elements. The coupling element includes two couplers. The first coupler has a mid-flange having a first side and a second side. The first side of the mid-flange includes a coupling portion extending therefrom. The second side of the mid-flange includes at least one protrusion and at least one opening. The second coupler is similar to the first coupler except that it may have a different coupling portion. The protrusions and openings are shaped so that when the two couplers are pressed together, the openings and protrusions form an interference fit to form the coupling element. The coupling element may include a decorative element that is captured between the two couplers when the couplers are pressed together to form the coupling element.

A multiuse stick, which may be used as a popsicle stick and reused for lighting and/or entertainment, e.g., as a toy and/or component thereof. The multiuse stick may be made of light conducting material and/or include a light guide. Light may be supplied by a LED and/or batteries. The LED and/or batteries may be internal or external to the popsicle stick. The multiuse stick may be configured for use as a toy and/or part thereof. The multiuse stick may be configured for use as a light and/or a wearable ornament. The multiuse stick may be used in the manufacture homemade popsicles and/or commercially produced popsicles. Components of the system may be sold separately and/or together, e.g., as a kit, as a unit, etc.

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.