This paper has made theoretical analysis and experimental research on the motion
principle of the
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.
Just Accepted
