Understanding some basic SUP fin terms will help you better grasp the key parameters we use when designing and optimizing fins for different paddling conditions. No single aspect of a fin should be considered in isolation. For example, we can create a short fin that offers high levels of tracking and stability compared to larger fins.
Depth
Fin depth is measured by taking the vertical measurement of the fin, regardless of its rake angle. Deeper fins help with stability but are not ideal for shallow water paddling.
Length
Fin length is calculated by measuring the total length of the fin, regardless of its rake angle. Typically, longer fins offer more tracking and stability. New racers should choose longer fins, while experienced paddlers can benefit from shorter fins.
Rake
SUP fin rake can be measured in two ways. The leading-edge rake angle is important for shedding weeds and seagrass. The fin rake angle also affects how a fin will turn and perform at speed. More upright fins are great for fast buoy turns, while fins with more rake are excellent for carving during downwind paddling or in the surf.
Area
The surface area of a SUP fin, measured in cm² or in², directly influences performance. Generally, more surface area increases tracking but also creates more drag. However, smaller is not always faster. Going too small may feel quick but can cause the board to "wag" and reduce your ability to track straight.
Foil
The most critical aspect of fin design is the foil shaping. The foil influences how the fin moves through the water and affects tracking, turning, speed, and handling. It is a common misconception that thin foils are always faster. In fact, thin foils without proper shaping are often used to cut production costs but may compromise performance.
Cord
The cord is the distance between the leading and trailing edge of the fin. A wider cord improves tracking and stability, while a narrower cord increases maneuverability and allows for faster buoy turns.
Construction
SUP fin construction plays a major role in performance. Materials range from plastic and fiberglass to high-performance carbon. Carbon fins are the lightest, stiffest, and most efficient, but also the most expensive. Black Project SUP fins are made using Carbon Infused LiteCore Technology, which maximizes performance, minimizes weight, and offers excellent durability.
Fins for Flat-Water Touring & Racing
These fins are designed for flat-water touring and racing – whether you’re cruising your local lake or sprinting 200 meters. The right combination of tracking, stability, speed, and maneuverability will help you paddle efficiently and comfortably.
Fins for Downwind & Ocean Racing
In downwind and ocean racing, success depends on reading the wind, waves, and current. These fins enhance your board’s surfing characteristics, helping you catch and ride swells with greater control and speed.
