FSI’s shortboard fins size small (NEW!), in stiff (matte black) or semi-flex (in glossy black, orange, or blue) are our latest fins for use in a thruster setup, as part of a quad setup, and as sidebites in a 2 + 1.
Note: Photos show smalls in quad and 2 + 1 setups.
Shortboard Fin Small Specs:
- Total area, set of 3: 30.42 sq. inches
- Area per fin: 10.14 sq. inches
- Rake/sweepback: 22 degrees
- Height/depth: 4.8 inches
- Foil section: symmetrical (double)
- Winglets area alone: 0.9 sq. inches
- Planform area alone: 9.75 sq. inches
- Fits FCS
Sizing of FSI Fins Compared to Typical Fins
Our fins have a lot of power. They generate a lot of hold and drive for their small size. (Read more about hold, drive, lift and drag.)
Because they have a lot of power, your right-sized FSI fin will have an area smaller than what you’re used to. And because they are smaller, they have less drag. This means that you can accelerate more quickly, paddle more easily, or surf longer.
[highlight]Winglets and other features we use make these fins about 20 to 30 percent more efficient than larger, older styles,[/highlight] so you need to downsize by about 20 to 30 percent as compared to the fin or set of fins you typically use. [toggle title_open=”More about fin sizing” title_closed=”More about fin sizing” hide=”yes” border=”yes” style=”default” excerpt_length=”0″ read_more_text=”Read More” read_less_text=”Read Less” include_excerpt_html=”no”]
Example: If you typically surf a set of mediums in a thruster setup, fins that are usually about 14.5 sq. inches each, you are surfing 43.5 sq. inches of fin. Try our smalls. Our new small is 10.14 sq. inches, and a set of three is 30.42 square inches, a 30 percent reduction in fin surface area, and a 30 percent reduction in skin-friction drag.
Another example: If your longboard or SUP board has a center fin and two sidebites, calculate the area, then try downsizing–try pulling off the sidebites and going with a single Wavegrinder 2 longboard-SUP fin. You will dramatically decrease the area, yet still get good hold and drive because of the winglets and other features of our fins. [CP_CALCULATED_FIELDS id=”6″]
FSI Fins, Areas in Sets
Because FSI’s current fins are symmetric, you can either get a set of the same fins, or mix smaller and larger fins to get the ride you want.
|Fin type||FSI size||Area, each||Area, set of 2||Area, set of 3||Area, set of 4|
|Shortboard fin (Available July 2014)||Small||10.14 sq. in.||20.28 sq. in.||30.42 sq. in.||40.56 sq. in.|
|Shortboard fin||Large||14.58 sq. in.||29.16 sq. in.||43.74 sq. in.||58.32 sq. in.|
|Longboard-SUP fin (discontinued)||Wavegrinder Classic||30.54 sq. in.||61.08 sq. in.|
|Longboard-SUP fin (Available July 2014)||Wavegrinder 2||30.60 sq. in.||61.20 sq. in.|