Watersport board fins with fin retention systems and watersport boards containing the same

1. A fin to be inserted into a fin box of a watersport board for stabilizing the watersport board during use on a body of water, the fin comprising:

a hydrodynamic blade configured to extend into a body of water when the fin is coupled to a watersport board that operates upon the body of water, wherein the hydrodynamic blade defines a fin plane and includes a leading edge, a trailing edge, and a foil surface extending between the leading edge and the trailing edge;

a fin base extending from the hydrodynamic blade and configured to be selectively received within a fin box of the watersport board; and

a fin retention system configured to restrict removal of the fin base from the fin box, wherein the fin retention system includes a selective retention system that is configured to selectively transition between an unlocked configuration, in which the selective retention system permits the fin to be inserted into and removed from the fin box, and a locked configuration, in which the selective retention system restricts the fin from being inserted into and removed from the fin box, wherein the selective retention system includes:

a retainer latch that is configured to extend within a retention channel of the fin box to restrict removal of the fin base from the fin box when the fin base is inserted into the fin box and the selective retention system is in the locked configuration and to pivot about a pivot axis when the selective retention system is transitioned between the unlocked configuration and the locked configuration; and

an actuator lever that is coupled to the retainer latch via a pivot shaft and that is configured to be actuated by a user to pivot the retainer latch about the pivot axis to selectively transition the selective retention system between the unlocked configuration and the locked configuration, wherein the pivot shaft extends at least partially through each of the fin base, the actuator lever, and a portion of the hydrodynamic blade that is distal the fin base relative to the actuator lever;

wherein the actuator lever forms a portion of the hydrodynamic blade when the selective retention system is in the locked configuration; wherein the actuator lever is configured to rotate away from the fin plane when the selective retention system transitions from the locked configuration to the unlocked configuration; and wherein the retainer latch is configured to rotate away from the fin plane when the selective retention system transitions from the unlocked configuration to the locked configuration.

2. The fin of claim 1 , wherein the retention channel of the fin box has a retention channel width, wherein the fin box further includes a neck portion that is configured to permit access to the retention channel from exterior the fin box, wherein the neck portion has a neck width that is smaller than the retention channel width; wherein the retention channel is at least partially defined by at least one ledge adjacent to the neck portion; wherein the fin base is configured to be at least partially received in the retention channel; wherein the retainer latch is configured to extend transversely across the retention channel when the selective retention system is in the locked configuration; and wherein the retainer latch is configured to be obstructed from removal from the fin box by the at least one ledge when the fin base is inserted into the fin box and when the selective retention system is in the locked configuration.

3. The fin of claim 2 , wherein the retention channel is at least partially defined by two opposed side walls, wherein the retention channel width is measured between the two opposed side walls, and wherein the retainer latch is configured to engage at least one of:

(i) the at least one ledge; and

(ii) at least one of the two opposed side walls

when the fin base is inserted into the fin box and when the selective retention system is in the locked configuration.

4. The fin of claim 2 , wherein the retention channel is at least partially defined by two opposed side walls, wherein the retention channel width is measured between the two opposed side walls, and wherein the retainer latch is configured to be spaced apart from each of the two opposed side walls and the at least one ledge when the fin base is inserted into the fin box and when the selective retention system is in the locked configuration.

5. The fin of claim 2 , wherein the fin retention system further includes a static retention structure that is configured to restrict removal of the fin base from the fin box via obstruction of the static retention structure by at least one ledge, wherein the static retention structure includes at least one channel pin extending from a surface of the fin base, wherein the fin box includes at least one pin slot that is defined by the at least one ledge and is configured to permit the at least one channel pin to pass therethrough, and wherein the at least one channel pin is configured to be received in the retention channel when the fin is received in the retention channel.

6. The fin of claim 1 , wherein the actuator lever forms a portion of the leading edge of the hydrodynamic blade when the selective retention system is in the locked configuration.

7. The fin of claim 1 , wherein the actuator lever forms a portion of the trailing edge of the hydrodynamic blade when the selective retention system is in the locked configuration.

8. The fin of claim 1 , wherein the actuator lever conforms to the foil surface when the selective retention system is in the locked configuration.

9. The fin of claim 1 , wherein the selective retention system further includes at least one retention system lock that is configured to maintain the selective retention system in the locked configuration, wherein the retention system lock is configured to resist unintentional transitioning of the selective retention system from the locked configuration to the unlocked configuration.

10. The fin of claim 9 , wherein the retention system lock includes a first component and a second component that is configured to engage the first component when the selective retention system is in the locked configuration, wherein the retention system lock is configured such that an interaction between the first component and the second component restricts the selective retention system from transitioning from the locked configuration to the unlocked configuration, and wherein the retention system lock further is configured to permit the selective retention system to transition from the locked configuration to the unlocked configuration responsive to a force in excess of a threshold unlocking force being applied to at least one of the first component and the second component.

11. The fin of claim 9 , wherein the retention system lock includes a base component that extends from a surface of the fin base toward the actuator lever when the selective retention system is in the locked configuration.

12. The fin of claim 11 , wherein the retention system lock includes an actuator lever component that is defined by the actuator lever, wherein the actuator lever component includes at least one of a recess configured to receive the base component and a cutout in the actuator lever configured to permit the actuator lever to resiliently deform to receive the base component when the selective retention system is in the locked configuration.

13. The fin of claim 9 , wherein the retention system lock includes a retainer latch component that is defined by the retainer latch, wherein the retainer latch component is configured to frictionally engage at least a portion of the fin box to restrict unintentional pivoting of the retainer latch when the fin base is inserted into the fin box and when the selective retention system is in the locked configuration.

14. The fin of claim 1 , wherein the retainer latch is configured to rotate symmetrically about the pivot axis.

15. The fin of claim 1 , wherein the retainer latch is configured to rotate asymmetrically about the pivot axis.

16. The fin of claim 1 , wherein the actuator lever is at least substantially aligned with the fin plane when the selective retention system is in the locked configuration.

17. The fin of claim 1 , wherein the retainer latch is at least substantially aligned with the fin plane when the selective retention system is in the unlocked configuration.

18. The fin of claim 1 , wherein the retainer latch includes a resilient peripheral bumper that includes at least one of a plastic and a rubber.

19. The fin of claim 1 , wherein the fin has a rake angle, as measured between a line passing through a midpoint of the fin base and extending perpendicular to the watersport board when the fin is installed in the fin box and a line passing through the midpoint of the fin base and a point on the hydrodynamic blade distal the watersport board when the fin is installed in the fin box, and wherein the rake angle is 20-60 degrees.

20. The fin of claim 1 , wherein the hydrodynamic blade has a cross-sectional shape that includes at least one of an airfoil and a hydrofoil.

21. A watersport board assembly, comprising:

the fin of claim 1 ; and

a watersport board with a fin box configured to selectively receive the fin of claim 1 .

22. A method for coupling a fin to a watersport board, the method comprising:

providing the fin of claim 1 ;

with the selective retention system in the unlocked configuration, inserting the fin base at least partially into the fin box; and

rotating the actuator lever to transition the selective retention system from the unlocked configuration, in which the retainer latch is aligned with the retention channel of the fin box, to the locked configuration, in which the retainer latch extends into the retention channel of the fin box.

23. A fin to be inserted into a fin box of a watersport board for stabilizing the watersport board during use on a body of water, the fin comprising:

a hydrodynamic blade configured to extend into a body of water when the fin is coupled to a watersport board that operates upon the body of water, wherein the hydrodynamic blade defines a fin plane and includes a leading edge, a trailing edge, and a foil surface extending between the leading edge and the trailing edge;

a fin base extending from the hydrodynamic blade and configured to be selectively received within a fin box of the watersport board; and

a fin retention system configured to restrict removal of the fin base from the fin box, wherein the fin retention system includes a selective retention system that is configured to selectively transition between an unlocked configuration, in which the selective retention system permits the fin to be inserted into and removed from the fin box, and a locked configuration, in which the selective retention system restricts the fin from being inserted into and removed from the fin box, wherein the selective retention system includes:

a retainer latch that is configured to extend within a retention channel of the fin box to restrict removal of the fin base from the fin box when the fin base is inserted into the fin box and the selective retention system is in the locked configuration and to pivot about a pivot axis when the selective retention system is transitioned between the unlocked configuration and the locked configuration; and

an actuator lever that is coupled to the retainer latch via a pivot shaft and that is configured to be actuated by a user to pivot the retainer latch about the pivot axis to selectively transition the selective retention system between the unlocked configuration and the locked configuration;

wherein the actuator lever forms a portion of the hydrodynamic blade when the selective retention system is in the locked configuration; wherein the actuator lever is configured to rotate away from the fin plane when the selective retention system transitions from the locked configuration to the unlocked configuration; wherein the retainer latch is configured to rotate away from the fin plane when the selective retention system transitions from the unlocked configuration to the locked configuration; wherein the selective retention system further includes at least one retention system lock that is configured to maintain the selective retention system in the locked configuration; wherein the retention system lock is configured to resist unintentional transitioning of the selective retention system from the locked configuration to the unlocked configuration; wherein the retention system lock includes a base component that extends from a surface of the fin base toward the actuator lever when the selective retention system is in the locked configuration; wherein the retention system lock includes an actuator lever component that is defined by the actuator lever; and wherein the actuator lever component includes at least one of a recess configured to receive the base component or a cutout in the actuator lever configured to permit the actuator lever to resiliently deform to receive the base component when the selective retention system is in the locked configuration.