| 1. The fin consists of a foot pocket (1) and a blade (2), the blade (2) having non-planar form of at least three segments (S) with transitions (T) following each other across the entire width a of the blade's (2) surface and along the blade (8), wherein the inclines of individual segments (S) according to the longitudinal axis are alternating, which means a segment (S) with an increasing incline is always followed by a segment (S) with a decreasing incline and vice- versa, and the transition (T) from one segment (S) with an increasing incline to another segment (S) with a decreasing incline or vice-versa is made as connective or includes a transitional part, flat or curved, or a break in the spot between two inclines. 2. Fin according to claim 1, characterized in that the two neighbouring segments (S) form the shape of a wave, a triangle, a trapezium or a tooth with or without a transition (T), while individual segments (S) are flat, mainly flat or curved and the lengths of two neighbouring segments (S) with a transition (T) define total length (L). 3. Fin according to the previous claims, characterized in that the height (H), total length (L) and transition (T) length are equal, or they can increase or decrease linearly, progressively or regressively enabling random combinations of changing shapes, heights (H), segments (S), total lengths (L) and transitions (T) along the blade (2). 4. Fin according to the previous claims, characterized in that the segment's height (H) is the highest at the root (7) of the blade (2) and decreases towards the ending (8) of the blade, total lengths (L) are equal or increasing from the root (7) towards the ending (8) of the blade (2), and the transition (T) lengths are equal or increasing from the root (7) towards the ending (8) of the blade (2). 5. Fin according to the previous claims, characterized in that the ratio between the height (H) and the length (L) of the segment at the root (7) of the blade is between 0.15 and 0.015 and then decreases towards 0 until the transition to flat part 10, 6. Fin according to the previous claims, characterized in that the segments (S) follow each other across the entire width of the blade's (2) surface or optionally in one part of the fin. 7. Fin according to the previous claims, characterized in that the blade (2), is made of wave- shaped segments (S) and connective transitions (T), wherein the waves form a sinusoid, and the blade (2) begins near the foot pocket (1) with the segment (SI) and increasing incline connectively continuing into the segment (S2) with a decreasing incline and then continuing into the segment (S3) with an increasing incline and so on until the transition to the flat part (10), which closes the blade (2), wherein waves or segments (S) follow each other in the longitudinal direction towards the ending (8) of the blade across the entire surface of the blade (2), and wherein the height (HI) of the segment (S) is the highest at the root (7) of the blade (2) and decreases towards the ending (8) of the blade and the total length (L) does not change and is constant across the entire length of the blade (2). |
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