Abstract: A ducted fan assembly includes a housing unit, a motor, and a propeller. The housing unit includes a duct member, and a hollow seat member disposed in the duct member. The motor is mounted to an exterior of the seat member, and includes a power cord extending through the seat member. The propeller is mounted to the motor and is driven thereby to generate an airflow that flows through the duct member and that acts on the motor.

Abstract: A ducted fan assembly includes a housing unit, a motor, and a propeller. The housing unit includes a duct member, and a hollow seat member disposed in the duct member. The motor is mounted to an exterior of the seat member, and includes a power cord extending through the seat member. The propeller is mounted to the motor and is driven thereby to generate an airflow that flows through the duct member and that acts on the motor.

Abstract: A wheel assembly for a model airplane includes a motor, a drive gear unit, a linkage, and a wheel unit. The drive gear unit includes a driven gear meshing with a driving gear connected fixedly to a spindle of the motor, and an output gear driven indirectly by the driven gear. The linkage includes a swing rod connected fixedly to the output gear, and a link connected pivotally to the swing rod. The wheel unit has a pivot end connected pivotally to an airplane body, a wheel-mounting end mounted with at least one wheel, and an intermediate portion connected pivotally to the link. The motor is operable to activate the drive gear unit so as to rotate the wheel unit between a generally horizontal idle position, and an upright landing position.

Abstract: A protective article includes a press molded body including a core of a foam material and a rigid shell of a plastic material molded over the core to thereby enclose intimately the core. The foam material is selected from expanded polystyrene, expanded polypropylene, expanded polyethylene, and ethylene-vinyl acetate copolymer. The plastic material is selected from acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polyethylene, polypropylene, and polystyrene.

Abstract: A wheel assembly for a model airplane includes a motor, a drive gear unit, a linkage, and a wheel unit. The drive gear unit includes a driven gear meshing with a driving gear connected fixedly to a spindle of the motor, and an output gear driven indirectly by the driven gear. The linkage includes a swing rod connected fixedly to the output gear, and a link connected pivotally to the swing rod. The wheel unit has a pivot end connected pivotally to an airplane body, a wheel-mounting end mounted with at least one wheel, and an intermediate portion connected pivotally to the link. The motor is operable to activate the drive gear unit so as to rotate the wheel unit between a generally horizontal idle position, and an upright landing position.

Abstract: A sports shoe includes a shoe body and a plurality of traction members. The shoe body has a sole portion and mounting seats protruding downwardly therefrom and each defining a chamber. Each traction member includes: a positioning unit mounted in the respective chamber and formed with a threaded hole; a connecting plate movably disposed in the respective chamber under the positioning unit and formed with an oval hole; a cleat disposed in the respective chamber and pivoted to the positioning unit and the connecting plate, and extending outwardly of the respective chamber, an angle of the cleat being adjusted when the connecting plate is moved relative to the positioning unit; a fastener engaging the threaded hole in the positioning unit and abutting against the connecting plate; and a locking unit for preventing relative movement between the positioning unit and the connecting plate when the fastener is tightened.

Abstract: A spike-adjustable spiked shoe includes a plurality of anchored walls on an outsole, each having an outer convex surface and an inner concave surface. A positioning unit has an abutment head and a guided end respectively facing toward a bearing wall in the outsole and the inner concave surface, and a tapped bore segment. The abutment head is depressed when it abuts against the bearing wall, thereby generating a sufficient friction force therebetween for holding the positioning unit against the anchored wall. An adjustable spike unit includes a spike body having a tightening surface, and a tightening member secured to the spike body and having a threaded shank that is threadedly engageable with the tapped bore segment such that the spike body can be retained in a normal or adjusted position relative to the outsole.