Black shark fin boat

A fin is a thin component or appendage attached to a larger body or structure. Fin are used in boat to control the movement or direction of wind.


Fins first evolved on fish as a means of locomotion. Fish fins are used to generate thrust and control the subsequent motion. Fish, and other aquatic animals such as cetaceans, actively propel and steer themselves with pectoral and tail fins. As they swim, they use other fins, such as dorsal and anal fins to achieve stability and refine their maneuvering.

source - Wikipedia

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