转动特性.理论分析表明念力转机前端铁钉做周期性类椭圆运动，木棍和铁钉的振动带动螺旋桨转动，螺旋桨的转动方向取决

于水平振动和竖直振动的相位差.实验上采用光放大法观察念力转机的运动过程，实验结果和理论分析结果吻合.实验表明用

手施加水平力时，螺旋桨的旋转方向与手的触碰位置有关.实验还发现单位时间摩擦凹槽的数目越多，螺旋桨转速越大，两者

具有线性关系.

gee-haw whammy diddle. In theory，based on the mechanics principle of the gee-haw whammy diddle，the principle

of rotation is analyzed and its rotation characteristics are studied. The theoretical analysis shows that the iron nail

in the front end of the gee-haw whammy diddle does periodic elliptic movement，the vibration of the stick and the

iron nail drives the rotation of the propeller as well as the rotation direction of propeller depends on the phase difference

between horizontal and vertical vibration. In the experiment，the optical amplification method is used to observe

the movement process of the gee-haw whammy diddle. The experimental results agree with the theoretical analysis

results. Experiments show that the rotation direction of the propeller is related to the contact position of the

hand when the horizontal force is exerted by the hand. It is also found that the more the number of the notches are

rubbed per unit time，the higher the rotating speed of the propeller，they have a linear relationship.