How the wave is made

A wakesurf wave does not exist naturally. It is manufactured, on every outing, by four settings that interact. Understanding them is not only the driver's business: a rider who knows what produces the wave can ask for what they need, instead of taking whatever they are given.

1. Ballast, which is to say weight

This is the main lever, by a long way. A wake boat carries tanks filled with lake water — several hundred kilos, sometimes over a tonne. That weight pushes the hull down, and a hull pushed down displaces more water. More water displaced, more wave.

The rule is simple: ballast sets the size of the wave. A small wave is almost never a speed or fine-tuning problem; it is a weight problem.

Distribution matters as much as quantity. You fill the side you surf on more heavily — listing the boat — and the stern more than the bow. A boat that noses down makes a flat, long wave; a boat too far back makes a short, steep wave that breaks.

2. Speed, which sets the shape

Between roughly 16 and 19 km/h, depending on hull and ballast. And within that range, every tenth counts.

Slower: the wave is shorter, taller and steeper. It pushes hard but the usable zone is small, which makes placement difficult.

Faster: the wave lengthens and softens, the usable zone grows but the push decreases. Too fast and it stops pushing altogether, and the rider drops off the back.

A beginner wants a long, soft wave: so you go slightly faster than you would for an experienced rider. This is counter-intuitive — people assume you should slow down for a beginner — and it is one of the most useful settings to know.

3. Surf Gate, which picks the side

This is the device that transformed wakesurfing some fifteen years ago. A plate deploys below the waterline on one side of the hull and deflects the water flow. The result: the wake, which is naturally symmetrical and therefore unusable, becomes asymmetrical. On one side it flattens out; on the other it builds into a clean, sustained wave.

The practical benefit is that you switch sides at the push of a button, without emptying or moving ballast. The next rider surfs on the right instead of the left within thirty seconds.

That detail matters more than it sounds when riding with several people: regular and goofy riders alternate without anyone having to put up with their bad side.

4. Passengers, the free adjustment

Human weight aboard is part of the ballast, and it is the only part you can move instantly. Shifting three people from the surf side to the other visibly changes the wave.

This is the fine-tuning lever. When the wave is nearly right but a little soft, move someone to the stern on the surf side before touching the ballast.

What order to set things in

The classic error is changing everything at once, which makes it impossible to know what produced the effect. The order that works:

1. Fill the ballast according to the number of people aboard and the side being surfed.
2. Set the speed within the range, aiming long and soft if the rider is a beginner.
3. Engage Surf Gate on the correct side.
4. Trim with passengers, one move at a time.

And one change per run. A wave is dialled in over three passes, not one.

What the boat cannot fix

A point of honesty: no setting compensates for a choppy lake. If the bise has raised twenty centimetres of chop, the wave will be irregular whatever the ballast — because the boat's wave superimposes itself on the existing waves rather than replacing them.

That is the entire reason for early-morning and late-afternoon slots: at those hours the surface is glass, and the manufactured wave is the only one on the lake. See the season guide for the month-by-month detail.

On our boat

The Axis T22 is fitted with Surf Gate II and Power Wedge III, which trims the hull — and therefore the height and shape of the wave — to the centimetre. That is what allows a switch from a learning wave to an experienced rider's wave between two runs, without emptying anything.

See the boat page, the other guides or the open slots.

All guides