Slalom of house swallow

�@A swallow makes use much of the inertia. It can turn the direction quickly, by using the tail forked off into two and able to twist, with the aid of the small weight (hence the small inertia moment). A swallow can turn to any direction by shifting the wing back or forth, in cooperation with the tail action. Then, the center of pressure shifts to front or rear of the center of gravity, and the moment in up or down direction can be adjusted. (Prod. May 2000, full�]scale, No.1)

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