At just ~7" in height, the Siren Deep 7 has the feel of a much deeper fin. We've accopmlished this by enhancing overall surface area (for stability), using very long chord length foil sections (for speed) and minimizing fin thickness (for efficiency). Because this fin is perfect for still water lake and lagoon paddling, we incorporated a radius at the base of the leading edge to allow the fin to shed weeds while retaining a relatively high aspect ratio for easier pivot turning at buoys, obstacles, etc. While not as adept in the bump as the Siren 747, paddlers encountering kelp on downwind runs will appreciate the Deep 7's weed shedding capability -- in heavy kelp, we recommend it.
The result of extensive R&D, the stand-alone speed and performance of a Siren by Curtis Fins SUP fin is a result of not only conscientious design work that relies upon proven hydrodynamic theory, but is also the result of sound composite engineering. Designed using sophistocated CAD, CAM and solid modeling techniques, every foil section is carefully selected by Curtis to ensure optimum performance; relying upon feedback from the Curtis Fins team to drive each fin's evolution.
Anatomy of a Siren by Curtis Fins SUP fin:
A Siren SUP fins by Curtis Fins begins by pressure laminating thin sheets of fiberglass together in a hydraulic press. This results in a fiberglass blank that consists of more continuous strands of glass than the traditional single-sheet wet-layup method of producing fin blanks -- which in turn equates to enhanced stiffness. By producing blanks with a higher flexural modulous (i.e., high rigidity), we are able make the fin thinner, which enhances efficiency, and therefore speed, through the water.
The fin blank is then fixtured in a CNC machine for precise, reliable reproduction of Curtis' original design. Subtleties make the difference when it comes to fin design, where small changes in foil shape can have a big impact on performance. No other mode of reproduction can compare to the CNC's ability to consistently deliver the key design components that make a Siren by Curtis Fin not only a performer, but a work of art.
