Thirty years of windsurfing experience: it's all handled by the marketing departments. Any number that you can't easily measure is fair game. Also, not all liters are created equal.

Fitzsup said..
How do the manufacturers work out the wind range of wing???

the duotone 7m slick sls has the same wind range as the North light wind 8m 6-16knots

I know rider weight has a bearing, but all North light wind wings have the same range.

In the blurb of North,rider height plays a role?..

North want you to choose the right Light Wind Nova for your size. I don't think they specify exactly but 8m would be for a heavy rider, 8 for medium and 6 for a lightweight. They openly say that there is no need for a range of Lightwind wings as they won't perform well in stronger winds and have no top end. A heavy rider might go for an 8m? Lightwind, a 6m? Nova and so on.
Sounds fair enough for me.
That said, range depends a lot on weight, foil, foilboard, willingness to pump up on the foil and most importantly skills.

BullroarerTook said..
Thirty years of windsurfing experience: it's all handled by the marketing departments. Any number that you can't easily measure is fair game. Also, not all liters are created equal.

Thx bullroarer,sounds about right a marketing ploy.