| 摘要 |
A device for the captive flight of a propeller-driven model airplane is disclosed. The device having a fixed arm with a pulley mounted on the free end thereof, a swingable arm with a motor mounted on the free end thereof, a cable attached to the motor and to the propeller via a transmission unit for transmitting power to the propeller, and a toric ring fixed with respect to the fixed arm. The cable is threaded over the pulley and through the toric ring between the motor and the airplane. As the motor is moved by the swingable arm with respect to the pulley and the toric ring, the effective length of the cable between the toric ring and the airplane is shortened or lengthened to control the trajectory of the airplane.
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