Here’s an overlay of our three different templates for k4 14cm fins. I’ve renamed the ‘TRI’ the ‘CARVE’ (as the ‘STUBBY’ is also a good choice for Tri fin boards). The areas are given next to the names.
Notice the greater area and wider base of the CARVE -this gives it greater drive. The STUBBY has less rake giving it more pivot, and a stiffer tip giving more release. The FLEX is our original template and still great for most sailors with the ideal mix of grip and looseness.
The STUBBY is the stiffest fin, followed by the CARVE, with the FLEX being the flexiest. For more info on what this means to your fin choice, see the section on TUNING.