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Freshly shaped surfboard blank on the racks in a Lanzarote shaping room

Surf Guide • Famara since 2010

Surfboard DesignRocker · Outline · Tails · Fins

What every curve on your board is actually doing

Written by local instructorsUpdated September 2026

A surfboard is a set of compromises

Every curve on a board buys you one thing and costs you another. More rocker turns tighter and paddles slower. A wider tail gives lift in weak waves and slides out in strong ones. Nothing on a surfboard is free, and that is the whole subject of this page.

Once you know your volume — and if you do not, start with choosing your surfboard — the shape is what decides how the board behaves under your feet. Here is what each element does, in plain language, with the shapes drawn out.

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A short history of the shape

For centuries boards were solid wood: up to five metres long and fifty kilos heavy, ridden straight towards the beach because nothing that heavy turns. The 1930s changed two things at once. Boards got lighter and hollow, and Tom Blake screwed a fin to the tail — the single change that made it possible to ride across the face of a wave instead of in front of it.

The 1950s brought foam and fibreglass, which took the weight down to something a teenager could carry and put surfing within reach of anyone who lived near a beach. From there the shapes came fast: the shortboard revolution of the late sixties, Mark Richards winning four world titles on his twin-fin fish, and in 1982 Simon Anderson adding a third fin to solve the twin-fin's habit of sliding out in powerful waves.

That thruster is still the default setup on most boards in our racks, four decades later. Everything since has been refinement: better foams, lighter glassing, computer-shaped blanks, and a return of old ideas — fish, mid-lengths, single fins — for people who want a different feel rather than more performance.

Line-up of solid wood surfboards from the 1930s, standing upright on the beach
Solid wood boards of the redwood era — up to five metres long and heavy enough that two people carried them to the water.
Black and white photo of Santa Monica lifeguards standing with their wooden surfboards in the 1930s
Santa Monica lifeguards in the 1930s, the legendary Pete Peterson at far right — the generation that first bolted a fin to the tail.

The seven things that shape a board

Element What it does What to look for
Length Sets paddle speed and stability. Longer boards get into waves earlier and hold a line; shorter boards fit into steeper, tighter parts of the wave. Longer for learning and for small waves, shorter only when you are already making late take-offs.
Outline (width and plan shape) Decides how the board carries volume. Wide through the middle means stability; wide through the tail means lift in weak surf. A wide point in front of centre for easy waves, closer to centre for performance turns.
Rocker The curve from nose to tail. Flat rocker paddles and glides fast; more rocker turns tighter and stops the nose catching on steep drops. Flat for Famara on a small day, more curve for hollow, powerful waves.
Rails The edges. Soft, rounded rails forgive and hold; hard, thin rails bite and release quickly. Softer rails while you are learning, harder rails once you are surfing the face.
Tail Controls how water leaves the board, which is what release and hold are made of. See the tail shapes below — this is where most of the character lives.
Fins Grip, drive and how loose the board feels. Setup matters more than brand. Thruster if you want one answer for everything; see the comparison below.
Volume distribution Where the foam sits. Thickness under the chest is paddle power; thickness in the tail is lift. Even foam through the chest for easier paddling, thinner tail for control in bigger surf.

Tail shapes

The tail is the last thing the water touches. A pointed tail lets water off gradually and holds in steep, powerful faces; a wide, square-cornered tail releases water abruptly and gives lift and snap in weak waves. Everything else is somewhere between those two.

Pin
Round pin
Round
Squash
Swallow
Bat
Diamond
Square
Tail Character Best in
Pin Maximum hold, minimum release. Drawn-out turns, no skip. Big, hollow, powerful waves — the classic gun tail.
Round pin The versatile version of the pin: smooth, predictable, still holds. Medium to solid waves with a clean face.
Round More area than a pin, so faster and easier to turn while still following the curve of the wave. Hollow and fast waves where you want control without stiffness.
Squash The default. Square corners bite in a bottom turn, round corners keep it from sliding. Almost everything — the safe choice for one board.
Swallow Two tips acting as two tails: extra width for speed, with the notch keeping traction. Small to medium waves with less power, fish and retro shapes.
Bat A wider variant of the swallow with an extra point of contact. Weak, flat surf where you need lift and speed.
Diamond Cuts the corners off a square tail: less area at the very end, so it turns more readily. Average waves, for surfers who want the turn to come easier.
Square Sharp corners and full area. Plans early, pivots tightly. Slow sections and small beach-break waves, ridden aggressively.

Fin setups

Fins do three jobs: they stop the tail sliding sideways, they convert your turn into drive, and they decide how loose the board feels. The number and placement matter far more than the brand on the sticker.

Single fin
Twin fin
Thruster
Quad
Bonzer 5
Setup Feel Drive and hold Who rides it
Single Smooth and stately. Long arcs, no snap. Excellent hold in a straight line, slow to change direction. Longboarders and anyone chasing a classic glide.
Twin Loose and fast, skates through flat sections. Plenty of speed, will slide out when the wave has real power. Fish and retro boards in small to medium surf.
Thruster Balanced — the setup everything else is measured against. Good drive, reliable hold, predictable release. Most surfers, most days. The default in our rental racks.
Quad Fast down the line, very direct out of a turn. More hold near the rail than a twin, more speed than a thruster. Intermediates in hollow waves, and anywhere you want speed.
Bonzer 5 Distinct, drawn-out and locked in. Huge hold, channels water through the tail. A small, loyal minority — and bigger, more powerful waves.

None of this replaces riding the shapes. Rent two different boards in Famara on the same swell and the difference between a squash and a round pin stops being theory in about twenty minutes. Our shop Famara Power keeps fins, boxes and boards shaped on the island by JFB, and will happily talk shapes for longer than you intended.

Shapes you can actually put your hands on

Most of what is described above is sitting on the racks in our shop in Caleta de Famara, a couple of minutes from the water. The boards worth singling out are the ones shaped here on the island by JFB — the shaper we send people to when they want something built for these waves rather than for a catalogue photo.

Not sure which of them is yours? Ride a few first — board rental in Famara costs a fraction of a wrong purchase.

What this means at Famara

Famara is a sand-bottom beach break with long, rolling waves and wind that builds through the afternoon. That rewards flatter rocker, fuller outlines and forgiving tails: a squash or a round tail on a thruster covers almost every day of the year here, and a swallow-tail fish is a genuinely good idea from June to September when the swell goes small and soft.

Pin tails and narrow, curvy shapes only make sense on the reefs around the island on a clean, solid swell — which the Lanzarote spot guide covers spot by spot. If you are still working out which board is yours in the first place, that decision lives in choosing your surfboard.

Want the short version, in the water? An instructor will tell you in one session why your board does what it does — book a surf lesson, or start from the beginning with the beginner course.

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Frequently asked questions

What is rocker on a surfboard?

Rocker is the curve from nose to tail when you look at the board side on. Flat rocker paddles faster and glides through weak sections; more rocker turns tighter and keeps the nose from burying on a steep drop.

Which tail shape is best for beginners?

A squash or a round tail. Both hold predictably, neither slides out when your weight lands in the wrong place, and they work in the kind of waves you will be riding for your first year.

Thruster, twin or quad — which should I ride?

Thruster if you want one setup that works everywhere. Quad when you want more speed in hollow waves, twin when the surf is small and you want the board to feel loose and playful.

Does the brand of fin matter?

Far less than the setup and the size. Fin area and placement change the board's behaviour dramatically; the logo on the side changes almost nothing.

Why do two boards with the same dimensions feel different?

Because dimensions do not describe rocker, rail shape, tail outline or where the foam sits. Two 6'4" boards with the same litres can be a gentle all-rounder and a demanding performance shape.

What board design works best in Lanzarote?

For the beach breaks: flatter rocker, a fuller outline and a squash or round tail on a thruster. The reef waves reward narrower shapes and pin tails, but only on clean, solid days.

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