Abstract: An aircraft rotor blade structure is disclosed. The rotor blade includes a read blade part made of a pearl board and a front blade part made of a plastic material. The front blade part is connected to the front edge of the read blade part. This read blade part helps reducing the weight of the blade. The front blade part enhances the transverse strength of the read blade part and renders a center of gravity on the front edge of the blade.

Abstract: A battery box assembly for toys includes a frame having an engaging portion on a side thereof and a box has a first end pivotably connected to the frame and a battery unit 3 is inserted into the box via an open end defined in a second end of the box. Two pivotable locking members are connected on two sides of the box and the battery unit has two protrusions which are removably engaged with the locking members. A hook member is pivotably connected to one of the two sides of the box and removably hooked to the engaging portion.

Abstract: A remote-control helicopter rotor mechanism includes a rotor with multiple blade-root attachments and each blade-root attachment includes a slot located between two arms. Each arm includes two clamping surfaces and a recess which is defined longitudinally in an inside thereof and located between the two clamping surfaces. Multiple blades each have an elongate body and a root, the root has two protrusions extending from two opposite sides thereof and a passage is defined through the two protrusions and the root. The root inserted into the slot of the blade-root attachment corresponding thereto and a screw extends through the two arms and the passage of the root to connect the root within the slot. The protrusions are matched with the recesses of the two arms and the two clamping surfaces are matched with surfaces of the root.

Abstract: A power transmission system for an aircraft is disclosed. A driving motor having a driving axle is provided inside an aircraft. The driving axle has a gear part and a wheel part. They drive a gear disk and a belt, respectively, to rotate the rotor and the tail rotor. The invention simplifies the power transmission structure of the aircraft.

Abstract: A central control system of a wireless remote-control model is capable of controlling a flight safety and effectively according to an operation control instruction signal data or a detector detection data instead of a single control value. Information such as the control, movement and abnormal detection of an electronic control machine installed on the wireless remote-control model are managed, determined and controlled jointly, so as to improve the safety and operability of the wireless remote-control model.

Abstract: A servomotor neutral position setting apparatus of a wireless remote-control model comes with a simple structure that embeds a servo rudder piece into an output shaft of a servomotor to set a neutral position with high precision.

Abstract: A wireless remote-control model includes a safety management portion having a central control device, and the safety management portion includes a determination portion, such that when a battery is connected correctly, a first mode buzz signal instruction is sent to a buzzer control portion for indicating that the battery is connected. If the battery is connected correctly and a start pushbutton is pressed during an examination period, or a second mode buzz signal instruction is sent to the buzzer control portion for indicating that the operation is started, or a third mode buzz signal instruction is sent to the buzzer control portion for indicating that a power motor is at a driving idle state when the examination determines a normal condition, so as to assure the safety of an operator (or a user) as well as the safety of the wireless remote-control model itself.

Abstract: A control apparatus of a wireless remote-control model and its operating parameter setup system is set up and changed by a personal computer, and various settings of setup information are transmitted to a wireless remote-control helicopter through a communication line, and control parameters are stored in a set value storage module of a memory, such that control parameters for the movement characteristics of a wireless remote-control model can be set up or changed easily to reduce the burden on the side of a signal transmitter.