Patent ID: 7311576

Claim:
A fin structure, comprising: a securing means for removably securing the fin structure to an underside of a watercraft such that a fin of the fin structure is capable of guiding the watercraft through water; a roll means for adjusting a roll of the fin to a desired roll, the roll defined as a first rotational degree of freedom about a longitudinal axis oriented along a length of the fin structure; and a yaw means for continuously and removably adjusting a yaw of the fin to a desired yaw, the yaw defined as second rotational degree of freedom about a vertical axis centered at yaw pivot point to achieve desired performance characteristics from the watercraft, the yaw means further comprising: a yaw track disposed at an aft portion of the base plate; a yaw pivot point disposed at a front portion of the base plate; a rotatable fastening means for rotatably fastening the fin assembly to the base plate at the yaw pivot point such that the fin assembly can be rotated about the yaw pivot point independent of the base plate; and a slidable fastening means for fastening the fin assembly at the yaw track such that the fin assembly can slide along the yaw track when adjusting the desired yaw.