Abstract: A control device for a model car is provided. The control device comprises: a rotation sensor configured to detect a rotation number of a first wheel and a rotation number of a second wheel of a model car; and a controller configured to perform driving control of a driving source of the model car such that a rotation number difference between the first wheel and the second wheel is reduced when the rotation number difference is greater than or equal to a threshold.

Abstract: A steering mechanism of a model vehicle which improves steering control accuracy is provided. The steering mechanism of the model vehicle includes the servo motor for steering configured to rotationally drive a steerable wheel of a model vehicle in a steering angle direction, the servo motor for steering being positioned between arm parts and the steerable wheel, the arm parts extending from a vehicle body side of the model vehicle to the steerable wheel. The servo motor for steering includes an output shaft parallel to a steering rotation axis of the steerable wheel and is configured to rotationally drive the steerable wheel by the output shaft.

Abstract: A servo device for radio control fine-adjusts a linkage rod, which links the servo device and an operation unit, in an accurate positional relationship. The servo device includes a servo motor having a servo output shaft on which a serration is formed, and a servo horn having a shaft bore opened at the lower side thereof, the shaft bore having an inner wall on which an inner serration to be engaged to the servo output shaft is formed. The servo horn has a servo horn base from which the horn output shaft protrudes, the horn output shaft being above and coaxially to the shaft bore, an operation unit having a shaft bore engaging the horn output shaft, and an angular adjustment mechanism for linking the shaft bore of the operation unit to the horn output shaft so as to movably fix circumferentially and at an arbitrary angle.

Abstract: The flight exercise without an assistant can be achieved and the risk, generated from a mistaken operation in the flight exercise is reduced. Prescribed performance titles or music is recorded in a recording mode, and the recorded sound is reproduced in a playback mode. Accordingly, it is possible to practice flights to the sound. Further, when a model airplane is not properly manipulated, the mistaken operation can be alarmed.

Abstract: A servo device for radio control is provided, capable of fine-adjusting a linkage rod, which links the servo device and an operation unit, in an accurate positional relationship. The servo device includes a servo motor having a servo output shaft on which a serration is formed, and a servo horn having a shaft bore opened at the lower side thereof, the shaft bore having an inner wall on which an inner serration to be engaged to the servo output shaft is formed. The servo horn has a servo horn base from which the horn output shaft protrudes, the horn output shaft being above and coaxially to the shaft bore, an operation unit having a shaft bore to which the horn output shaft is engaged, and an angular adjustment mechanism for linking the shaft bore of the operation unit to the horn output shaft so as to movably fix circumferentially and at an arbitrary angle.