本实用新型可改变传动比使飞机模型以不同速度飞行或增长航时。
The utility model has the capability to vary the transmission ratio, causing the airplane model to fly at different speeds or to increase the endurance.
调节油缸的长度，改变输入轴和输出轴间的传动比。
The transmission ratio of the input shaft and the output shaft can be changed by regulating the length of the oil cylinder.
为了能够改变变速器的传动比，大多数自动变速器使用了行星齿轮机构。
To change the gear ratio, most automatic transmissions use planetary gear set.
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