In rec.windsurfing jeff feehan wrote:

....

depending on what boats they race there, you might need more than
10 kts - 12 would be safer.

But that's boring! 17-20 kts is the sweet spot for my taste.

I'm pretty sure I can't plane my Formula stuff in 10-12 kts. (Of course,
I'm by far the worst Formula "racer" around...)

Cheers,
Cliff