Half a knot is never just half a knot

In yacht racing there is something called a polar diagram. For a given wind speed and wind angle, it shows the speed a yacht is capable of sailing. Not as a guarantee, but as a reference. A theoretical best.

During the transatlantic races I sailed, that polar diagram was always in the back of our minds. We did not stare at it all day, but we knew where we should be. It told us whether we were sailing to the potential of the yacht, the conditions, and ourselves.

Sometimes the difference between reality and that theoretical line was small. Half a knot below polar. About 0.9 kilometres per hour. Roughly 0.6 miles per hour. A number that feels almost too small to take seriously.

Yet crossing an ocean, it becomes very real. If you sail half a knot below your polar for long stretches of a transatlantic crossing, you arrive a day later. Not because something went wrong, but because small inefficiencies were allowed to exist. You spend more time in the same weather systems. You carry more fatigue. You arrive later to the next opportunity. Subtle effects, but decisive ones.

That is why I sometimes kept bringing it up, and yes, I am aware it could sound persistent. When I said "we are half a knot under polar," it was never about pressure or criticism. It was about attention. About reminding ourselves that the polar was not a fantasy, but a compass.

The polar diagram is theoretical by nature, yet it matters precisely because it shows what is possible when things are aligned. When the yacht is clean, the trim is right, decisions are thoughtful, and "good enough" has not slowly replaced "as good as we can make it."

This is where the parallel with sustainability feels very natural to me. In design, engineering, and innovation, we all have a polar of our own. A benchmark of what we know can be achieved. Often it is not practical in every moment, and it is rarely reached perfectly. But it gives direction. And when we consistently operate just a little below it, the impact does not show immediately. It shows over time and over distance.

Progress is rarely lost in one big mistake. It slips away when small margins stop being questioned. In the same way, meaningful progress is built by staying attentive to those margins, even when they seem insignificant.

Half a knot is never just half a knot. Over distance, it becomes the difference between staying ahead and slowly falling behind, without ever noticing when it happened.