Learn · Board science · Anatomy
Surfboard anatomy: every part and what it does in the water
Outline, rocker, foil, rails, bottom, nose, tail and fins: what each part is, what it changes when you surf and how it is built in a hollow wooden board.
Short answer: a board is defined in three views. From above, the outline. From the side, rocker and foil. In section, the rails and the bottom. Nose, tail and fins finish the design. No part works alone: the board rides as a whole.
Plan view
- 1Nosethe front end
- 2Wide pointwhere the volume sits
- 3Railthe edge, deck to bottom
- 4Tailthe back end, releases water
- 5Stringerthe skeleton’s centre spine
- 6Finson reinforcement blocks
Outline: the shape from above
What it is
The board’s shape seen from above: length, width, where the wide point sits and how full or narrow the nose and tail are.
In the water
A parallel, full outline gives stability, paddle power and straight-line speed. A curvier one, narrower at the ends, turns in less space. A wide point forward helps paddling; further back, it helps pivoting.
In a WOODKIT hollow board: the outline becomes the deck and bottom skins and the path of the rails.
From the side · vertical scale exaggerated
- 1Rockerthe bottom curve
- 2Nosehow much it lifts off flat
- 3Tailhow much it lifts off flat
- 4Foilthe height of each rib
Rocker: the bottom curve
What it is
The board’s curve seen from the side, measured from a flat surface: how much the nose and tail lift.
In the water
Low rocker: more speed and glide, better paddling, less room in steep waves. More rocker: the board fits vertical waves and turns tighter, at the cost of some speed.
In a WOODKIT hollow board: rocker isn’t sanded in: the rocker table and the lower profile of the stringer and ribs set it. What the machine cuts is what you surf.
Foil: thickness along the board
What it is
How thickness is spread from nose to tail. Two boards with the same maximum thickness can have very different foils.
In the water
More thickness in the middle and thin ends: a sensitive board that’s easy to sink into turns. Volume spread towards the ends: more paddle power and stability.
In a WOODKIT hollow board: foil comes from the height of each rib. That’s why the board’s volume is set when the frame is cut.
Rail types · in section
In the WOODKIT kit · you shape the rail by hand
Rails: where the board grips
What it is
The edge section, from top face to bottom. It can be round and full (50/50 type) or end in a sharper edge underneath.
In the water
A round rail grips the wave face smoothly and forgives. A rail with an edge releases water cleanly and gives response and speed, especially in the back third. Many boards mix both: soft in front, edge behind.
In a WOODKIT hollow board: the rails are Paulownia strips you shape by hand. It’s the most hand-crafted part of the build.
Bottom · sections seen from the tail
Bottom: how water runs underneath
What it is
The bottom’s cross-section: flat, concave (centre higher than the rails), double concave or vee (centre lower).
In the water
Concave channels water and gives lift and speed. Vee makes rail-to-rail transitions easier, especially in the tail. A flat bottom is neutral and predictable.
In a WOODKIT hollow board: bottom contours are cut into the lower profile of each rib, and the bottom skin follows them.
Nose
Tail · from widest to narrowest
Nose and tail
What it is
The ends of the board. At the tail, the shape (squash, round pin, swallow, pin) decides how it releases water.
In the water
A full nose gives paddle power and stability; a pointy one, less weight up front and more manoeuvrability. A wide tail gives lift in small waves; a narrow one, hold in powerful waves.
In a WOODKIT hollow board: nose and tail are solid blocks shaped at the end. They are kept as light as possible, because mass at the ends is what you feel most in a turn.
Fin set-ups · seen from the bottom
Fins
What it is
The fins under the tail: one (single), two (twin), three (thruster) or four (quad), glassed-on or in boxes.
In the water
They give hold and direction. A single gives long, smooth turns; a twin, speed and looseness; a thruster, control; a quad, speed with hold.
In a WOODKIT hollow board: each fin box sits on a reinforcement block planned in the drawing, because in a hollow board there is no foam to spread the load.
Want to see how it all goes together piece by piece? It’s in How it is built. And if you wonder about the weight of the wood, we explain it in Does a wooden surfboard float differently?
FAQ
What is surfboard rocker?
The board’s curve seen from the side: how much the nose and tail lift from a flat surface. Low rocker gives speed and paddle power; more rocker, manoeuvrability in steep waves.
What is foil?
How thickness is spread from nose to tail. Two boards with the same maximum thickness can ride differently depending on how they spread it.
What is the difference between a concave and a vee bottom?
Concave channels water and gives lift and speed; vee makes rail-to-rail transitions easier, especially in the tail.
Which parts of a hollow wooden board are shaped by hand?
The rails and the nose and tail blocks. Rocker, foil and bottom contours are set by the frame.
From anatomy to your board
Every Signature kit brings the shaper’s design already turned into parts: rocker, foil and bottom come in the frame.
